From 10ed729f8498a1345a33cf017234517250f10a2f Mon Sep 17 00:00:00 2001
From: joyqi <magike.net@gmail.com>
Date: Wed, 20 Nov 2013 11:16:25 +0800
Subject: [PATCH] =?UTF-8?q?=E7=94=A8marked.js=E4=BB=A5=E5=8F=8AMarkdownExt?=
 =?UTF-8?q?raExtended=E6=9B=BF=E6=8D=A2=E6=97=A7=E7=9A=84markdown=E8=A7=A3?=
 =?UTF-8?q?=E6=9E=90=E5=BC=95=E6=93=8E?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

全面支持表格，以及回车换行
---
 .gitattributes                                |   15 +
 admin/editor-js.php                           |   34 +-
 admin/js/markdown.js                          | 5416 -----------------
 admin/js/marked.js                            | 1168 ++++
 admin/js/pagedown.js                          | 2426 ++++++++
 usr/themes/default/header.php                 |  131 +-
 var/Markdown.php                              | 1631 -----
 var/MarkdownExtraExtended.php                 | 3245 ++++++++++
 .../Widget/Helper/PageNavigator/Box.php       |    9 +-
 var/Widget/Abstract/Contents.php              |    6 +-
 var/Widget/Archive.php                        |    7 +-
 11 files changed, 6962 insertions(+), 7126 deletions(-)
 create mode 100644 .gitattributes
 delete mode 100644 admin/js/markdown.js
 create mode 100644 admin/js/marked.js
 create mode 100644 admin/js/pagedown.js
 delete mode 100644 var/Markdown.php
 create mode 100644 var/MarkdownExtraExtended.php

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 00000000..acc5026f
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,15 @@
+# Set default behaviour, in case users don't have core.autocrlf set.
+* text=auto
+
+# Explicitly declare text files we want to always be normalized and converted 
+# to native line endings on checkout.
+*.php text eol=lf
+*.js text eol=lf
+*.css text eol=lf
+*.html text eol=lf
+*.xml text eol=lf
+
+# Denote all files that are truly binary and should not be modified.
+*.png binary
+*.jpg binary
+
diff --git a/admin/editor-js.php b/admin/editor-js.php
index 1a356645..5b810565 100644
--- a/admin/editor-js.php
+++ b/admin/editor-js.php
@@ -1,5 +1,6 @@
 <?php $content = !empty($post) ? $post : $page; if ($options->markdown && (!$content->have() || $content->isMarkdown)): ?>
-<script src="<?php $options->adminUrl('js/markdown.js?v=' . $suffixVersion); ?>"></script>
+<script src="<?php $options->adminUrl('js/marked.js?v=' . $suffixVersion); ?>"></script>
+<script src="<?php $options->adminUrl('js/pagedown.js?v=' . $suffixVersion); ?>"></script>
 <script src="<?php $options->adminUrl('js/diff.js?v=' . $suffixVersion); ?>"></script>
 <script>
 $(document).ready(function () {
@@ -7,7 +8,7 @@ $(document).ready(function () {
         toolbar = $('<div class="editor" id="wmd-button-bar" />').insertBefore(textarea.parent())
         preview = $('<div id="wmd-preview" />').insertAfter('.submit');
 
-    var converter = new Showdown.converter(), options = {};
+    var options = {};
 
     options.strings = {
         bold: '<?php _e('加粗'); ?> <strong> Ctrl+B',
@@ -55,13 +56,36 @@ $(document).ready(function () {
         help: '<?php _e('Markdown语法帮助'); ?>'
     };
 
-    var editor = new Markdown.Editor(converter, '', options),
+    var editor = new Markdown.Editor(marked, '', options),
         diffMatch = new diff_match_patch(), last = '', preview = $('#wmd-preview'),
         mark = '@mark' + Math.ceil(Math.random() * 100000000) + '@',
         span = '<span class="diff" />';
+    
+    // 设置markdown
+    marked.setOptions({
+        breaks      :   true
+    });
 
     // 自动跟随
-    converter.postConversion = function (html) {
+    editor.hooks.chain('postMarkdown', function (html) {
+        html = html.replace(/<\/?(\!doctype|html|head|body|link|title|input|select|button|textarea|style|noscript)[^>]*>/ig, function (all) {
+            return all.replace(/&/g, '&amp;')
+                .replace(/</g, '&lt;')
+                .replace(/>/g, '&gt;')
+                .replace(/'/g, '&#039;')
+                .replace(/"/g, '&quot;');
+        });
+
+        if (html.indexOf('<!--more-->') > 0) {
+            var parts = html.split(/\s*<\!\-\-more\-\->\s*/),
+                summary = parts.shift(),
+                details = parts.join('');
+
+            html = '<div class="summary">' + summary + '</div>'
+                + '<div class="details">' + details + '</div>';
+        }
+
+
         var diffs = diffMatch.diff_main(last, html);
         last = html;
 
@@ -110,7 +134,7 @@ $(document).ready(function () {
         }
 
         return html;
-    }
+    });
 
     editor.hooks.chain('onPreviewRefresh', function () {
         var diff = $('.diff', preview);
diff --git a/admin/js/markdown.js b/admin/js/markdown.js
deleted file mode 100644
index c36cadf6..00000000
--- a/admin/js/markdown.js
+++ /dev/null
@@ -1,5416 +0,0 @@
-//
-// showdown.js -- A javascript port of Markdown.
-//
-// Copyright (c) 2007 John Fraser.
-//
-// Original Markdown Copyright (c) 2004-2005 John Gruber
-//   <http://daringfireball.net/projects/markdown/>
-//
-// Redistributable under a BSD-style open source license.
-// See license.txt for more information.
-//
-// The full source distribution is at:
-//
-//              A A L
-//              T C A
-//              T K B
-//
-//   <http://www.attacklab.net/>
-//
-
-//
-// Wherever possible, Showdown is a straight, line-by-line port
-// of the Perl version of Markdown.
-//
-// This is not a normal parser design; it's basically just a
-// series of string substitutions.  It's hard to read and
-// maintain this way,  but keeping Showdown close to the original
-// design makes it easier to port new features.
-//
-// More importantly, Showdown behaves like markdown.pl in most
-// edge cases.  So web applications can do client-side preview
-// in Javascript, and then build identical HTML on the server.
-//
-// This port needs the new RegExp functionality of ECMA 262,
-// 3rd Edition (i.e. Javascript 1.5).  Most modern web browsers
-// should do fine.  Even with the new regular expression features,
-// We do a lot of work to emulate Perl's regex functionality.
-// The tricky changes in this file mostly have the "attacklab:"
-// label.  Major or self-explanatory changes don't.
-//
-// Smart diff tools like Araxis Merge will be able to match up
-// this file with markdown.pl in a useful way.  A little tweaking
-// helps: in a copy of markdown.pl, replace "#" with "//" and
-// replace "$text" with "text".  Be sure to ignore whitespace
-// and line endings.
-//
-
-
-//
-// Showdown usage:
-//
-//   var text = "Markdown *rocks*.";
-//
-//   var converter = new Showdown.converter();
-//   var html = converter.makeHtml(text);
-//
-//   alert(html);
-//
-// Note: move the sample code to the bottom of this
-// file before uncommenting it.
-//
-
-
-//
-// Showdown namespace
-//
-var Showdown = { extensions: {} };
-
-//
-// forEach
-//
-var forEach = Showdown.forEach = function(obj, callback) {
-    if (typeof obj.forEach === 'function') {
-        obj.forEach(callback);
-    } else {
-        var i, len = obj.length;
-        for (i = 0; i < len; i++) {
-            callback(obj[i], i, obj);
-        }
-    }
-};
-
-//
-// Standard extension naming
-//
-var stdExtName = function(s) {
-    return s.replace(/[_-]||\s/g, '').toLowerCase();
-};
-
-//
-// converter
-//
-// Wraps all "globals" so that the only thing
-// exposed is makeHtml().
-//
-Showdown.converter = function(converter_options) {
-
-//
-// Globals:
-//
-
-// Global hashes, used by various utility routines
-var g_urls;
-var g_titles;
-var g_html_blocks;
-
-// Used to track when we're inside an ordered or unordered list
-// (see _ProcessListItems() for details):
-var g_list_level = 0;
-
-// Global extensions
-var g_lang_extensions = [];
-var g_output_modifiers = [];
-
-
-//
-// Automatic Extension Loading (node only):
-//
-
-if (typeof module !== 'undefind' && typeof exports !== 'undefined' && typeof require !== 'undefind') {
-    var fs = require('fs');
-
-    if (fs) {
-        // Search extensions folder
-        var extensions = fs.readdirSync((__dirname || '.')+'/extensions').filter(function(file){
-            return ~file.indexOf('.js');
-        }).map(function(file){
-            return file.replace(/\.js$/, '');
-        });
-        // Load extensions into Showdown namespace
-        Showdown.forEach(extensions, function(ext){
-            var name = stdExtName(ext);
-            Showdown.extensions[name] = require('./extensions/' + ext);
-        });
-    }
-}
-
-this.postConversion = null;
-this.preConversion = null;
-var self = this;
-
-this.makeHtml = function(text) {
-//
-// Main function. The order in which other subs are called here is
-// essential. Link and image substitutions need to happen before
-// _EscapeSpecialCharsWithinTagAttributes(), so that any *'s or _'s in the <a>
-// and <img> tags get encoded.
-//
-
-    // Clear the global hashes. If we don't clear these, you get conflicts
-    // from other articles when generating a page which contains more than
-    // one article (e.g. an index page that shows the N most recent
-    // articles):
-    g_urls = {};
-    g_titles = {};
-    g_html_blocks = [];
-
-    if (self.preConversion) {
-        text = self.preConversion(text);
-    }
-
-    // attacklab: Replace ~ with ~T
-    // This lets us use tilde as an escape char to avoid md5 hashes
-    // The choice of character is arbitray; anything that isn't
-    // magic in Markdown will work.
-    text = text.replace(/~/g,"~T");
-
-    // attacklab: Replace $ with ~D
-    // RegExp interprets $ as a special character
-    // when it's in a replacement string
-    text = text.replace(/\$/g,"~D");
-
-    // Standardize line endings
-    text = text.replace(/\r\n/g,"\n"); // DOS to Unix
-    text = text.replace(/\r/g,"\n"); // Mac to Unix
-
-    // Make sure text begins and ends with a couple of newlines:
-    text = "\n\n" + text + "\n\n";
-
-    // Convert all tabs to spaces.
-    text = _Detab(text);
-
-    // Strip any lines consisting only of spaces and tabs.
-    // This makes subsequent regexen easier to write, because we can
-    // match consecutive blank lines with /\n+/ instead of something
-    // contorted like /[ \t]*\n+/ .
-    text = text.replace(/^[ \t]+$/mg,"");
-
-    // Run language extensions
-    Showdown.forEach(g_lang_extensions, function(x){
-        text = _ExecuteExtension(x, text);
-    });
-
-    // Handle github codeblocks prior to running HashHTML so that
-    // HTML contained within the codeblock gets escaped propertly
-    text = _DoGithubCodeBlocks(text);
-
-    // Turn block-level HTML blocks into hash entries
-    text = _HashHTMLBlocks(text);
-
-    // Strip link definitions, store in hashes.
-    text = _StripLinkDefinitions(text);
-
-    text = _RunBlockGamut(text);
-
-    text = _UnescapeSpecialChars(text);
-
-    // attacklab: Restore dollar signs
-    text = text.replace(/~D/g,"$$");
-
-    // attacklab: Restore tildes
-    text = text.replace(/~T/g,"~");
-
-    // Run output modifiers
-    Showdown.forEach(g_output_modifiers, function(x){
-        text = _ExecuteExtension(x, text);
-    });
-
-    text = text.replace(/<\/?(\!doctype|html|head|body|link|title|input|select|button|textarea|style|noscript)[^>]*>/ig, function (all) {
-        return all.replace(/&/g, '&amp;')
-            .replace(/</g, '&lt;')
-            .replace(/>/g, '&gt;')
-            .replace(/'/g, '&#039;')
-            .replace(/"/g, '&quot;');
-        return all;
-    });
-
-    if (text.indexOf('<!--more-->') > 0) {
-        var parts = text.split(/\s*<\!\-\-more\-\->\s*/),
-            summary = parts.shift(),
-            details = parts.join('');
-
-        text = '<div class="summary">' + summary + '</div>'
-            + '<div class="details">' + details + '</div>';
-    }
-
-    if (self.postConversion) {
-        text = self.postConversion(text);
-    }
-
-    return text;
-};
-//
-// Options:
-//
-
-// Parse extensions options into separate arrays
-if (converter_options && converter_options.extensions) {
-
-    // Iterate over each plugin
-    Showdown.forEach(converter_options.extensions, function(plugin){
-
-        // Assume it's a bundled plugin if a string is given
-        if (typeof plugin === 'string') {
-            plugin = Showdown.extensions[stdExtName(plugin)];
-        }
-
-        if (typeof plugin === 'function') {
-            // Iterate over each extension within that plugin
-            Showdown.forEach(plugin(self), function(ext){
-                // Sort extensions by type
-                if (ext.type) {
-                    if (ext.type === 'language' || ext.type === 'lang') {
-                        g_lang_extensions.push(ext);
-                    } else if (ext.type === 'output' || ext.type === 'html') {
-                        g_output_modifiers.push(ext);
-                    }
-                } else {
-                    // Assume language extension
-                    g_output_modifiers.push(ext);
-                }
-            });
-        } else {
-            throw "Extension '" + plugin + "' could not be loaded.  It was either not found or is not a valid extension.";
-        }
-    });
-}
-
-
-var _ExecuteExtension = function(ext, text) {
-    if (ext.regex) {
-        var re = new RegExp(ext.regex, 'g');
-        return text.replace(re, ext.replace);
-    } else if (ext.filter) {
-        return ext.filter(text);
-    }
-};
-
-var _StripLinkDefinitions = function(text) {
-//
-// Strips link definitions from text, stores the URLs and titles in
-// hash references.
-//
-
-    // Link defs are in the form: ^[id]: url "optional title"
-
-    /*
-        var text = text.replace(/
-                ^[ ]{0,3}\[(.+)\]:  // id = $1  attacklab: g_tab_width - 1
-                  [ \t]*
-                  \n?               // maybe *one* newline
-                  [ \t]*
-                <?(\S+?)>?          // url = $2
-                  [ \t]*
-                  \n?               // maybe one newline
-                  [ \t]*
-                (?:
-                  (\n*)             // any lines skipped = $3 attacklab: lookbehind removed
-                  ["(]
-                  (.+?)             // title = $4
-                  [")]
-                  [ \t]*
-                )?                  // title is optional
-                (?:\n+|$)
-              /gm,
-              function(){...});
-    */
-
-    // attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug
-    text += "~0";
-
-    text = text.replace(/^[ ]{0,3}\[(.+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+|(?=~0))/gm,
-        function (wholeMatch,m1,m2,m3,m4) {
-            m1 = m1.toLowerCase();
-            g_urls[m1] = _EncodeAmpsAndAngles(m2);  // Link IDs are case-insensitive
-            if (m3) {
-                // Oops, found blank lines, so it's not a title.
-                // Put back the parenthetical statement we stole.
-                return m3+m4;
-            } else if (m4) {
-                g_titles[m1] = m4.replace(/"/g,"&quot;");
-            }
-
-            // Completely remove the definition from the text
-            return "";
-        }
-    );
-
-    // attacklab: strip sentinel
-    text = text.replace(/~0/,"");
-
-    return text;
-}
-
-
-var _HashHTMLBlocks = function(text) {
-    // attacklab: Double up blank lines to reduce lookaround
-    text = text.replace(/\n/g,"\n\n");
-
-    // Hashify HTML blocks:
-    // We only want to do this for block-level HTML tags, such as headers,
-    // lists, and tables. That's because we still want to wrap <p>s around
-    // "paragraphs" that are wrapped in non-block-level tags, such as anchors,
-    // phrase emphasis, and spans. The list of tags we're looking for is
-    // hard-coded:
-    var block_tags_a = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del|style|section|header|footer|nav|article|aside";
-    var block_tags_b = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|style|section|header|footer|nav|article|aside";
-
-    // First, look for nested blocks, e.g.:
-    //   <div>
-    //     <div>
-    //     tags for inner block must be indented.
-    //     </div>
-    //   </div>
-    //
-    // The outermost tags must start at the left margin for this to match, and
-    // the inner nested divs must be indented.
-    // We need to do this before the next, more liberal match, because the next
-    // match will start at the first `<div>` and stop at the first `</div>`.
-
-    // attacklab: This regex can be expensive when it fails.
-    /*
-        var text = text.replace(/
-        (                       // save in $1
-            ^                   // start of line  (with /m)
-            <($block_tags_a)    // start tag = $2
-            \b                  // word break
-                                // attacklab: hack around khtml/pcre bug...
-            [^\r]*?\n           // any number of lines, minimally matching
-            </\2>               // the matching end tag
-            [ \t]*              // trailing spaces/tabs
-            (?=\n+)             // followed by a newline
-        )                       // attacklab: there are sentinel newlines at end of document
-        /gm,function(){...}};
-    */
-    text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del)\b[^\r]*?\n<\/\2>[ \t]*(?=\n+))/gm,hashElement);
-
-    //
-    // Now match more liberally, simply from `\n<tag>` to `</tag>\n`
-    //
-
-    /*
-        var text = text.replace(/
-        (                       // save in $1
-            ^                   // start of line  (with /m)
-            <($block_tags_b)    // start tag = $2
-            \b                  // word break
-                                // attacklab: hack around khtml/pcre bug...
-            [^\r]*?             // any number of lines, minimally matching
-            </\2>               // the matching end tag
-            [ \t]*              // trailing spaces/tabs
-            (?=\n+)             // followed by a newline
-        )                       // attacklab: there are sentinel newlines at end of document
-        /gm,function(){...}};
-    */
-    text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|style|section|header|footer|nav|article|aside)\b[^\r]*?<\/\2>[ \t]*(?=\n+)\n)/gm,hashElement);
-
-    // Special case just for <hr />. It was easier to make a special case than
-    // to make the other regex more complicated.
-
-    /*
-        text = text.replace(/
-        (                       // save in $1
-            \n\n                // Starting after a blank line
-            [ ]{0,3}
-            (<(hr)              // start tag = $2
-            \b                  // word break
-            ([^<>])*?           //
-            \/?>)               // the matching end tag
-            [ \t]*
-            (?=\n{2,})          // followed by a blank line
-        )
-        /g,hashElement);
-    */
-    text = text.replace(/(\n[ ]{0,3}(<(hr)\b([^<>])*?\/?>)[ \t]*(?=\n{2,}))/g,hashElement);
-
-    // Special case for standalone HTML comments:
-
-    /*
-        text = text.replace(/
-        (                       // save in $1
-            \n\n                // Starting after a blank line
-            [ ]{0,3}            // attacklab: g_tab_width - 1
-            <!
-            (--[^\r]*?--\s*)+
-            >
-            [ \t]*
-            (?=\n{2,})          // followed by a blank line
-        )
-        /g,hashElement);
-    */
-    text = text.replace(/(\n\n[ ]{0,3}<!(--[^\r]*?--\s*)+>[ \t]*(?=\n{2,}))/g,hashElement);
-
-    // PHP and ASP-style processor instructions (<?...?> and <%...%>)
-
-    /*
-        text = text.replace(/
-        (?:
-            \n\n                // Starting after a blank line
-        )
-        (                       // save in $1
-            [ ]{0,3}            // attacklab: g_tab_width - 1
-            (?:
-                <([?%])         // $2
-                [^\r]*?
-                \2>
-            )
-            [ \t]*
-            (?=\n{2,})          // followed by a blank line
-        )
-        /g,hashElement);
-    */
-    text = text.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g,hashElement);
-
-    // attacklab: Undo double lines (see comment at top of this function)
-    text = text.replace(/\n\n/g,"\n");
-    return text;
-}
-
-var hashElement = function(wholeMatch,m1) {
-    var blockText = m1;
-
-    // Undo double lines
-    blockText = blockText.replace(/\n\n/g,"\n");
-    blockText = blockText.replace(/^\n/,"");
-
-    // strip trailing blank lines
-    blockText = blockText.replace(/\n+$/g,"");
-
-    // Replace the element text with a marker ("~KxK" where x is its key)
-    blockText = "\n\n~K" + (g_html_blocks.push(blockText)-1) + "K\n\n";
-
-    return blockText;
-};
-
-var _RunBlockGamut = function(text) {
-//
-// These are all the transformations that form block-level
-// tags like paragraphs, headers, and list items.
-//
-    text = _DoHeaders(text);
-
-    // Do Horizontal Rules:
-    var key = hashBlock("<hr />");
-    text = text.replace(/^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$/gm,key);
-    text = text.replace(/^[ ]{0,2}([ ]?\-[ ]?){3,}[ \t]*$/gm,key);
-    text = text.replace(/^[ ]{0,2}([ ]?\_[ ]?){3,}[ \t]*$/gm,key);
-
-    text = _DoLists(text);
-    text = _DoCodeBlocks(text);
-    text = _DoBlockQuotes(text);
-
-    // We already ran _HashHTMLBlocks() before, in Markdown(), but that
-    // was to escape raw HTML in the original Markdown source. This time,
-    // we're escaping the markup we've just created, so that we don't wrap
-    // <p> tags around block-level tags.
-    text = _HashHTMLBlocks(text);
-    text = _FormParagraphs(text);
-
-    return text;
-};
-
-
-var _RunSpanGamut = function(text) {
-//
-// These are all the transformations that occur *within* block-level
-// tags like paragraphs, headers, and list items.
-//
-
-    text = _DoCodeSpans(text);
-    text = _EscapeSpecialCharsWithinTagAttributes(text);
-    text = _EncodeBackslashEscapes(text);
-
-    // Process anchor and image tags. Images must come first,
-    // because ![foo][f] looks like an anchor.
-    text = _DoImages(text);
-    text = _DoAnchors(text);
-
-    // Make links out of things like `<http://example.com/>`
-    // Must come after _DoAnchors(), because you can use < and >
-    // delimiters in inline links like [this](<url>).
-    text = _DoAutoLinks(text);
-    text = _EncodeAmpsAndAngles(text);
-    text = _DoItalicsAndBold(text);
-
-    // Do hard breaks:
-    text = text.replace(/  +\n/g," <br />\n");
-
-    return text;
-}
-
-var _EscapeSpecialCharsWithinTagAttributes = function(text) {
-//
-// Within tags -- meaning between < and > -- encode [\ ` * _] so they
-// don't conflict with their use in Markdown for code, italics and strong.
-//
-
-    // Build a regex to find HTML tags and comments.  See Friedl's
-    // "Mastering Regular Expressions", 2nd Ed., pp. 200-201.
-    var regex = /(<[a-z\/!$]("[^"]*"|'[^']*'|[^'">])*>|<!(--.*?--\s*)+>)/gi;
-
-    text = text.replace(regex, function(wholeMatch) {
-        var tag = wholeMatch.replace(/(.)<\/?code>(?=.)/g,"$1`");
-        tag = escapeCharacters(tag,"\\`*_");
-        return tag;
-    });
-
-    return text;
-}
-
-var _DoAnchors = function(text) {
-//
-// Turn Markdown link shortcuts into XHTML <a> tags.
-//
-    //
-    // First, handle reference-style links: [link text] [id]
-    //
-
-    /*
-        text = text.replace(/
-        (                           // wrap whole match in $1
-            \[
-            (
-                (?:
-                    \[[^\]]*\]      // allow brackets nested one level
-                    |
-                    [^\[]           // or anything else
-                )*
-            )
-            \]
-
-            [ ]?                    // one optional space
-            (?:\n[ ]*)?             // one optional newline followed by spaces
-
-            \[
-            (.*?)                   // id = $3
-            \]
-        )()()()()                   // pad remaining backreferences
-        /g,_DoAnchors_callback);
-    */
-    text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g,writeAnchorTag);
-
-    //
-    // Next, inline-style links: [link text](url "optional title")
-    //
-
-    /*
-        text = text.replace(/
-            (                       // wrap whole match in $1
-                \[
-                (
-                    (?:
-                        \[[^\]]*\]  // allow brackets nested one level
-                    |
-                    [^\[\]]         // or anything else
-                )
-            )
-            \]
-            \(                      // literal paren
-            [ \t]*
-            ()                      // no id, so leave $3 empty
-            <?(.*?)>?               // href = $4
-            [ \t]*
-            (                       // $5
-                (['"])              // quote char = $6
-                (.*?)               // Title = $7
-                \6                  // matching quote
-                [ \t]*              // ignore any spaces/tabs between closing quote and )
-            )?                      // title is optional
-            \)
-        )
-        /g,writeAnchorTag);
-    */
-    text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\]\([ \t]*()<?(.*?(?:\(.*?\).*?)?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,writeAnchorTag);
-
-    //
-    // Last, handle reference-style shortcuts: [link text]
-    // These must come last in case you've also got [link test][1]
-    // or [link test](/foo)
-    //
-
-    /*
-        text = text.replace(/
-        (                           // wrap whole match in $1
-            \[
-            ([^\[\]]+)              // link text = $2; can't contain '[' or ']'
-            \]
-        )()()()()()                 // pad rest of backreferences
-        /g, writeAnchorTag);
-    */
-    text = text.replace(/(\[([^\[\]]+)\])()()()()()/g, writeAnchorTag);
-
-    return text;
-}
-
-var writeAnchorTag = function(wholeMatch,m1,m2,m3,m4,m5,m6,m7) {
-    if (m7 == undefined) m7 = "";
-    var whole_match = m1;
-    var link_text   = m2;
-    var link_id  = m3.toLowerCase();
-    var url     = m4;
-    var title   = m7;
-
-    if (url == "") {
-        if (link_id == "") {
-            // lower-case and turn embedded newlines into spaces
-            link_id = link_text.toLowerCase().replace(/ ?\n/g," ");
-        }
-        url = "#"+link_id;
-
-        if (g_urls[link_id] != undefined) {
-            url = g_urls[link_id];
-            if (g_titles[link_id] != undefined) {
-                title = g_titles[link_id];
-            }
-        }
-        else {
-            if (whole_match.search(/\(\s*\)$/m)>-1) {
-                // Special case for explicit empty url
-                url = "";
-            } else {
-                return whole_match;
-            }
-        }
-    }
-
-    url = escapeCharacters(url,"*_");
-    var result = "<a href=\"" + url + "\"";
-
-    if (title != "") {
-        title = title.replace(/"/g,"&quot;");
-        title = escapeCharacters(title,"*_");
-        result +=  " title=\"" + title + "\"";
-    }
-
-    result += ">" + link_text + "</a>";
-
-    return result;
-}
-
-
-var _DoImages = function(text) {
-//
-// Turn Markdown image shortcuts into <img> tags.
-//
-
-    //
-    // First, handle reference-style labeled images: ![alt text][id]
-    //
-
-    /*
-        text = text.replace(/
-        (                       // wrap whole match in $1
-            !\[
-            (.*?)               // alt text = $2
-            \]
-
-            [ ]?                // one optional space
-            (?:\n[ ]*)?         // one optional newline followed by spaces
-
-            \[
-            (.*?)               // id = $3
-            \]
-        )()()()()               // pad rest of backreferences
-        /g,writeImageTag);
-    */
-    text = text.replace(/(!\[(.*?)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g,writeImageTag);
-
-    //
-    // Next, handle inline images:  ![alt text](url "optional title")
-    // Don't forget: encode * and _
-
-    /*
-        text = text.replace(/
-        (                       // wrap whole match in $1
-            !\[
-            (.*?)               // alt text = $2
-            \]
-            \s?                 // One optional whitespace character
-            \(                  // literal paren
-            [ \t]*
-            ()                  // no id, so leave $3 empty
-            <?(\S+?)>?          // src url = $4
-            [ \t]*
-            (                   // $5
-                (['"])          // quote char = $6
-                (.*?)           // title = $7
-                \6              // matching quote
-                [ \t]*
-            )?                  // title is optional
-        \)
-        )
-        /g,writeImageTag);
-    */
-    text = text.replace(/(!\[(.*?)\]\s?\([ \t]*()<?(\S+?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,writeImageTag);
-
-    return text;
-}
-
-var writeImageTag = function(wholeMatch,m1,m2,m3,m4,m5,m6,m7) {
-    var whole_match = m1;
-    var alt_text   = m2;
-    var link_id  = m3.toLowerCase();
-    var url     = m4;
-    var title   = m7;
-
-    if (!title) title = "";
-
-    if (url == "") {
-        if (link_id == "") {
-            // lower-case and turn embedded newlines into spaces
-            link_id = alt_text.toLowerCase().replace(/ ?\n/g," ");
-        }
-        url = "#"+link_id;
-
-        if (g_urls[link_id] != undefined) {
-            url = g_urls[link_id];
-            if (g_titles[link_id] != undefined) {
-                title = g_titles[link_id];
-            }
-        }
-        else {
-            return whole_match;
-        }
-    }
-
-    alt_text = alt_text.replace(/"/g,"&quot;");
-    url = escapeCharacters(url,"*_");
-    var result = "<img src=\"" + url + "\" alt=\"" + alt_text + "\"";
-
-    // attacklab: Markdown.pl adds empty title attributes to images.
-    // Replicate this bug.
-
-    //if (title != "") {
-        title = title.replace(/"/g,"&quot;");
-        title = escapeCharacters(title,"*_");
-        result +=  " title=\"" + title + "\"";
-    //}
-
-    result += " />";
-
-    return result;
-}
-
-
-var _DoHeaders = function(text) {
-
-    // Setext-style headers:
-    //  Header 1
-    //  ========
-    //
-    //  Header 2
-    //  --------
-    //
-    text = text.replace(/^(.+)[ \t]*\n=+[ \t]*\n+/gm,
-        function(wholeMatch,m1){return hashBlock('<h1 id="' + headerId(m1) + '">' + _RunSpanGamut(m1) + "</h1>");});
-
-    text = text.replace(/^(.+)[ \t]*\n-+[ \t]*\n+/gm,
-        function(matchFound,m1){return hashBlock('<h2 id="' + headerId(m1) + '">' + _RunSpanGamut(m1) + "</h2>");});
-
-    // atx-style headers:
-    //  # Header 1
-    //  ## Header 2
-    //  ## Header 2 with closing hashes ##
-    //  ...
-    //  ###### Header 6
-    //
-
-    /*
-        text = text.replace(/
-            ^(\#{1,6})              // $1 = string of #'s
-            [ \t]*
-            (.+?)                   // $2 = Header text
-            [ \t]*
-            \#*                     // optional closing #'s (not counted)
-            \n+
-        /gm, function() {...});
-    */
-
-    text = text.replace(/^(\#{1,6})[ \t]*(.+?)[ \t]*\#*\n+/gm,
-        function(wholeMatch,m1,m2) {
-            var h_level = m1.length;
-            return hashBlock("<h" + h_level + ' id="' + headerId(m2) + '">' + _RunSpanGamut(m2) + "</h" + h_level + ">");
-        });
-
-    function headerId(m) {
-        return m.replace(/[^\w]/g, '').toLowerCase();
-    }
-    return text;
-}
-
-// This declaration keeps Dojo compressor from outputting garbage:
-var _ProcessListItems;
-
-var _DoLists = function(text) {
-//
-// Form HTML ordered (numbered) and unordered (bulleted) lists.
-//
-
-    // attacklab: add sentinel to hack around khtml/safari bug:
-    // http://bugs.webkit.org/show_bug.cgi?id=11231
-    text += "~0";
-
-    // Re-usable pattern to match any entirel ul or ol list:
-
-    /*
-        var whole_list = /
-        (                                   // $1 = whole list
-            (                               // $2
-                [ ]{0,3}                    // attacklab: g_tab_width - 1
-                ([*+-]|\d+[.])              // $3 = first list item marker
-                [ \t]+
-            )
-            [^\r]+?
-            (                               // $4
-                ~0                          // sentinel for workaround; should be $
-            |
-                \n{2,}
-                (?=\S)
-                (?!                         // Negative lookahead for another list item marker
-                    [ \t]*
-                    (?:[*+-]|\d+[.])[ \t]+
-                )
-            )
-        )/g
-    */
-    var whole_list = /^(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm;
-
-    if (g_list_level) {
-        text = text.replace(whole_list,function(wholeMatch,m1,m2) {
-            var list = m1;
-            var list_type = (m2.search(/[*+-]/g)>-1) ? "ul" : "ol";
-
-            // Turn double returns into triple returns, so that we can make a
-            // paragraph for the last item in a list, if necessary:
-            list = list.replace(/\n{2,}/g,"\n\n\n");;
-            var result = _ProcessListItems(list);
-
-            // Trim any trailing whitespace, to put the closing `</$list_type>`
-            // up on the preceding line, to get it past the current stupid
-            // HTML block parser. This is a hack to work around the terrible
-            // hack that is the HTML block parser.
-            result = result.replace(/\s+$/,"");
-            result = "<"+list_type+">" + result + "</"+list_type+">\n";
-            return result;
-        });
-    } else {
-        whole_list = /(\n\n|^\n?)(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/g;
-        text = text.replace(whole_list,function(wholeMatch,m1,m2,m3) {
-            var runup = m1;
-            var list = m2;
-
-            var list_type = (m3.search(/[*+-]/g)>-1) ? "ul" : "ol";
-            // Turn double returns into triple returns, so that we can make a
-            // paragraph for the last item in a list, if necessary:
-            var list = list.replace(/\n{2,}/g,"\n\n\n");;
-            var result = _ProcessListItems(list);
-            result = runup + "<"+list_type+">\n" + result + "</"+list_type+">\n";
-            return result;
-        });
-    }
-
-    // attacklab: strip sentinel
-    text = text.replace(/~0/,"");
-
-    return text;
-}
-
-_ProcessListItems = function(list_str) {
-//
-//  Process the contents of a single ordered or unordered list, splitting it
-//  into individual list items.
-//
-    // The $g_list_level global keeps track of when we're inside a list.
-    // Each time we enter a list, we increment it; when we leave a list,
-    // we decrement. If it's zero, we're not in a list anymore.
-    //
-    // We do this because when we're not inside a list, we want to treat
-    // something like this:
-    //
-    //    I recommend upgrading to version
-    //    8. Oops, now this line is treated
-    //    as a sub-list.
-    //
-    // As a single paragraph, despite the fact that the second line starts
-    // with a digit-period-space sequence.
-    //
-    // Whereas when we're inside a list (or sub-list), that line will be
-    // treated as the start of a sub-list. What a kludge, huh? This is
-    // an aspect of Markdown's syntax that's hard to parse perfectly
-    // without resorting to mind-reading. Perhaps the solution is to
-    // change the syntax rules such that sub-lists must start with a
-    // starting cardinal number; e.g. "1." or "a.".
-
-    g_list_level++;
-
-    // trim trailing blank lines:
-    list_str = list_str.replace(/\n{2,}$/,"\n");
-
-    // attacklab: add sentinel to emulate \z
-    list_str += "~0";
-
-    /*
-        list_str = list_str.replace(/
-            (\n)?                           // leading line = $1
-            (^[ \t]*)                       // leading whitespace = $2
-            ([*+-]|\d+[.]) [ \t]+           // list marker = $3
-            ([^\r]+?                        // list item text   = $4
-            (\n{1,2}))
-            (?= \n* (~0 | \2 ([*+-]|\d+[.]) [ \t]+))
-        /gm, function(){...});
-    */
-    list_str = list_str.replace(/(\n)?(^[ \t]*)([*+-]|\d+[.])[ \t]+([^\r]+?(\n{1,2}))(?=\n*(~0|\2([*+-]|\d+[.])[ \t]+))/gm,
-        function(wholeMatch,m1,m2,m3,m4){
-            var item = m4;
-            var leading_line = m1;
-            var leading_space = m2;
-
-            if (leading_line || (item.search(/\n{2,}/)>-1)) {
-                item = _RunBlockGamut(_Outdent(item));
-            }
-            else {
-                // Recursion for sub-lists:
-                item = _DoLists(_Outdent(item));
-                item = item.replace(/\n$/,""); // chomp(item)
-                item = _RunSpanGamut(item);
-            }
-
-            return  "<li>" + item + "</li>\n";
-        }
-    );
-
-    // attacklab: strip sentinel
-    list_str = list_str.replace(/~0/g,"");
-
-    g_list_level--;
-    return list_str;
-}
-
-
-var _DoCodeBlocks = function(text) {
-//
-//  Process Markdown `<pre><code>` blocks.
-//
-
-    /*
-        text = text.replace(text,
-            /(?:\n\n|^)
-            (                               // $1 = the code block -- one or more lines, starting with a space/tab
-                (?:
-                    (?:[ ]{4}|\t)           // Lines must start with a tab or a tab-width of spaces - attacklab: g_tab_width
-                    .*\n+
-                )+
-            )
-            (\n*[ ]{0,3}[^ \t\n]|(?=~0))    // attacklab: g_tab_width
-        /g,function(){...});
-    */
-
-    // attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug
-    text += "~0";
-
-    text = text.replace(/(?:\n\n|^)((?:(?:[ ]{4}|\t).*\n+)+)(\n*[ ]{0,3}[^ \t\n]|(?=~0))/g,
-        function(wholeMatch,m1,m2) {
-            var codeblock = m1;
-            var nextChar = m2;
-
-            codeblock = _EncodeCode( _Outdent(codeblock));
-            codeblock = _Detab(codeblock);
-            codeblock = codeblock.replace(/^\n+/g,""); // trim leading newlines
-            codeblock = codeblock.replace(/\n+$/g,""); // trim trailing whitespace
-
-            codeblock = "<pre><code>" + codeblock + "\n</code></pre>";
-
-            return hashBlock(codeblock) + nextChar;
-        }
-    );
-
-    // attacklab: strip sentinel
-    text = text.replace(/~0/,"");
-
-    return text;
-};
-
-var _DoGithubCodeBlocks = function(text) {
-//
-//  Process Github-style code blocks
-//  Example:
-//  ```ruby
-//  def hello_world(x)
-//    puts "Hello, #{x}"
-//  end
-//  ```
-//
-
-
-    // attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug
-    text += "~0";
-
-    text = text.replace(/(?:^|\n)```(.*)\n([\s\S]*?)\n```/g,
-        function(wholeMatch,m1,m2) {
-            var language = m1;
-            var codeblock = m2;
-
-            codeblock = _EncodeCode(codeblock);
-            codeblock = _Detab(codeblock);
-            codeblock = codeblock.replace(/^\n+/g,""); // trim leading newlines
-            codeblock = codeblock.replace(/\n+$/g,""); // trim trailing whitespace
-
-            codeblock = "<pre><code" + (language ? " class=\"lang-" + language + '"' : "") + ">" + codeblock + "\n</code></pre>";
-
-            return hashBlock(codeblock);
-        }
-    );
-
-    // attacklab: strip sentinel
-    text = text.replace(/~0/,"");
-
-    return text;
-}
-
-var hashBlock = function(text) {
-    text = text.replace(/(^\n+|\n+$)/g,"");
-    return "\n\n~K" + (g_html_blocks.push(text)-1) + "K\n\n";
-}
-
-var _DoCodeSpans = function(text) {
-//
-//   *  Backtick quotes are used for <code></code> spans.
-//
-//   *  You can use multiple backticks as the delimiters if you want to
-//   include literal backticks in the code span. So, this input:
-//
-//       Just type ``foo `bar` baz`` at the prompt.
-//
-//     Will translate to:
-//
-//       <p>Just type <code>foo `bar` baz</code> at the prompt.</p>
-//
-//  There's no arbitrary limit to the number of backticks you
-//  can use as delimters. If you need three consecutive backticks
-//  in your code, use four for delimiters, etc.
-//
-//  *  You can use spaces to get literal backticks at the edges:
-//
-//       ... type `` `bar` `` ...
-//
-//     Turns to:
-//
-//       ... type <code>`bar`</code> ...
-//
-
-    /*
-        text = text.replace(/
-            (^|[^\\])                   // Character before opening ` can't be a backslash
-            (`+)                        // $2 = Opening run of `
-            (                           // $3 = The code block
-                [^\r]*?
-                [^`]                    // attacklab: work around lack of lookbehind
-            )
-            \2                          // Matching closer
-            (?!`)
-        /gm, function(){...});
-    */
-
-    text = text.replace(/(^|[^\\])(`+)([^\r]*?[^`])\2(?!`)/gm,
-        function(wholeMatch,m1,m2,m3,m4) {
-            var c = m3;
-            c = c.replace(/^([ \t]*)/g,""); // leading whitespace
-            c = c.replace(/[ \t]*$/g,"");   // trailing whitespace
-            c = _EncodeCode(c);
-            return m1+"<code>"+c+"</code>";
-        });
-
-    return text;
-}
-
-var _EncodeCode = function(text) {
-//
-// Encode/escape certain characters inside Markdown code runs.
-// The point is that in code, these characters are literals,
-// and lose their special Markdown meanings.
-//
-    // Encode all ampersands; HTML entities are not
-    // entities within a Markdown code span.
-    text = text.replace(/&/g,"&amp;");
-
-    // Do the angle bracket song and dance:
-    text = text.replace(/</g,"&lt;");
-    text = text.replace(/>/g,"&gt;");
-
-    // Now, escape characters that are magic in Markdown:
-    text = escapeCharacters(text,"\*_{}[]\\",false);
-
-// jj the line above breaks this:
-//---
-
-//* Item
-
-//   1. Subitem
-
-//            special char: *
-//---
-
-    return text;
-}
-
-
-var _DoItalicsAndBold = function(text) {
-
-    // <strong> must go first:
-    text = text.replace(/(\*\*|__)(?=\S)([^\r]*?\S[*_]*)\1/g,
-        "<strong>$2</strong>");
-
-    text = text.replace(/(\*|_)(?=\S)([^\r]*?\S)\1/g,
-        "<em>$2</em>");
-
-    return text;
-}
-
-
-var _DoBlockQuotes = function(text) {
-
-    /*
-        text = text.replace(/
-        (                               // Wrap whole match in $1
-            (
-                ^[ \t]*>[ \t]?          // '>' at the start of a line
-                .+\n                    // rest of the first line
-                (.+\n)*                 // subsequent consecutive lines
-                \n*                     // blanks
-            )+
-        )
-        /gm, function(){...});
-    */
-
-    text = text.replace(/((^[ \t]*>[ \t]?.+\n(.+\n)*\n*)+)/gm,
-        function(wholeMatch,m1) {
-            var bq = m1;
-
-            // attacklab: hack around Konqueror 3.5.4 bug:
-            // "----------bug".replace(/^-/g,"") == "bug"
-
-            bq = bq.replace(/^[ \t]*>[ \t]?/gm,"~0");   // trim one level of quoting
-
-            // attacklab: clean up hack
-            bq = bq.replace(/~0/g,"");
-
-            bq = bq.replace(/^[ \t]+$/gm,"");       // trim whitespace-only lines
-            bq = _RunBlockGamut(bq);                // recurse
-
-            bq = bq.replace(/(^|\n)/g,"$1  ");
-            // These leading spaces screw with <pre> content, so we need to fix that:
-            bq = bq.replace(
-                    /(\s*<pre>[^\r]+?<\/pre>)/gm,
-                function(wholeMatch,m1) {
-                    var pre = m1;
-                    // attacklab: hack around Konqueror 3.5.4 bug:
-                    pre = pre.replace(/^  /mg,"~0");
-                    pre = pre.replace(/~0/g,"");
-                    return pre;
-                });
-
-            return hashBlock("<blockquote>\n" + bq + "\n</blockquote>");
-        });
-    return text;
-}
-
-
-var _FormParagraphs = function(text) {
-//
-//  Params:
-//    $text - string to process with html <p> tags
-//
-
-    // Strip leading and trailing lines:
-    text = text.replace(/^\n+/g,"");
-    text = text.replace(/\n+$/g,"");
-
-    var grafs = text.split(/\n{2,}/g);
-    var grafsOut = [];
-
-    //
-    // Wrap <p> tags.
-    //
-    var end = grafs.length;
-    for (var i=0; i<end; i++) {
-        var str = grafs[i];
-
-        // if this is an HTML marker, copy it
-        if (str.search(/~K(\d+)K/g) >= 0) {
-            grafsOut.push(str);
-        }
-        else if (str.search(/\S/) >= 0) {
-            str = _RunSpanGamut(str);
-            str = str.replace(/^([ \t]*)/g,"<p>");
-            str += "</p>"
-            grafsOut.push(str);
-        }
-
-    }
-
-    //
-    // Unhashify HTML blocks
-    //
-    end = grafsOut.length;
-    for (var i=0; i<end; i++) {
-        // if this is a marker for an html block...
-        while (grafsOut[i].search(/~K(\d+)K/) >= 0) {
-            var blockText = g_html_blocks[RegExp.$1];
-            blockText = blockText.replace(/\$/g,"$$$$"); // Escape any dollar signs
-            grafsOut[i] = grafsOut[i].replace(/~K\d+K/,blockText);
-        }
-    }
-
-    return grafsOut.join("\n\n");
-}
-
-
-var _EncodeAmpsAndAngles = function(text) {
-// Smart processing for ampersands and angle brackets that need to be encoded.
-
-    // Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin:
-    //   http://bumppo.net/projects/amputator/
-    text = text.replace(/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/g,"&amp;");
-
-    // Encode naked <'s
-    text = text.replace(/<(?![a-z\/?\$!])/gi,"&lt;");
-
-    return text;
-}
-
-
-var _EncodeBackslashEscapes = function(text) {
-//
-//   Parameter:  String.
-//   Returns:   The string, with after processing the following backslash
-//             escape sequences.
-//
-
-    // attacklab: The polite way to do this is with the new
-    // escapeCharacters() function:
-    //
-    //  text = escapeCharacters(text,"\\",true);
-    //  text = escapeCharacters(text,"`*_{}[]()>#+-.!",true);
-    //
-    // ...but we're sidestepping its use of the (slow) RegExp constructor
-    // as an optimization for Firefox.  This function gets called a LOT.
-
-    text = text.replace(/\\(\\)/g,escapeCharacters_callback);
-    text = text.replace(/\\([`*_{}\[\]()>#+-.!])/g,escapeCharacters_callback);
-    return text;
-}
-
-
-var _handleTrailingParens = function(wholeMatch, lookbehind, protocol, link) {
-    if (lookbehind)
-        return wholeMatch;
-    if (link.charAt(link.length - 1) !== ")")
-        return "<" + protocol + link + ">";
-    var parens = link.match(/[()]/g);
-    var level = 0;
-    for (var i = 0; i < parens.length; i++) {
-        if (parens[i] === "(") {
-            if (level <= 0)
-                level = 1;
-            else
-                level++;
-        }
-        else {
-            level--;
-        }
-    }
-    var tail = "";
-    if (level < 0) {
-        var re = new RegExp("\\){1," + (-level) + "}$");
-        link = link.replace(re, function (trailingParens) {
-                tail = trailingParens;
-                return "";
-                });
-    }
-
-    // console.log(protocol, link, tail);
-
-    return "<" + protocol + link + ">" + tail;
-}
-
-var _DoAutoLinks = function(text) {
-
-    // text = text.replace(/<((https?|ftp|dict):[^'">\s]+)>/gi,"<a href=\"$1\">$1</a>");
-    text = text.replace(/(="|<)?\b(https?|ftp)(:\/\/[-A-Z0-9+&@#\/%?=~_|\[\]\(\)!:,\.;]*[-A-Z0-9+&@#\/%=~_|\[\])])(?=$|\W)/gi, _handleTrailingParens);
-    var replacer = function (wholematch, m1) { return "<a href=\"" + m1 + "\">" + m1 + "</a>"; }
-    text = text.replace(/<((https?|ftp):[^'">\s]+)>/gi, replacer);
-
-    // Email addresses: <address@domain.foo>
-
-    /*
-        text = text.replace(/
-            <
-            (?:mailto:)?
-            (
-                [-.\w]+
-                \@
-                [-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
-            )
-            >
-        /gi, _DoAutoLinks_callback());
-    */
-    text = text.replace(/<(?:mailto:)?([-.\w]+\@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)>/gi,
-        function(wholeMatch,m1) {
-            return _EncodeEmailAddress( _UnescapeSpecialChars(m1) );
-        }
-    );
-
-    return text;
-}
-
-
-var _EncodeEmailAddress = function(addr) {
-//
-//  Input: an email address, e.g. "foo@example.com"
-//
-//  Output: the email address as a mailto link, with each character
-//  of the address encoded as either a decimal or hex entity, in
-//  the hopes of foiling most address harvesting spam bots. E.g.:
-//
-//  <a href="&#x6D;&#97;&#105;&#108;&#x74;&#111;:&#102;&#111;&#111;&#64;&#101;
-//     x&#x61;&#109;&#x70;&#108;&#x65;&#x2E;&#99;&#111;&#109;">&#102;&#111;&#111;
-//     &#64;&#101;x&#x61;&#109;&#x70;&#108;&#x65;&#x2E;&#99;&#111;&#109;</a>
-//
-//  Based on a filter by Matthew Wickline, posted to the BBEdit-Talk
-//  mailing list: <http://tinyurl.com/yu7ue>
-//
-
-    var encode = [
-        function(ch){return "&#"+ch.charCodeAt(0)+";";},
-        function(ch){return "&#x"+ch.charCodeAt(0).toString(16)+";";},
-        function(ch){return ch;}
-    ];
-
-    addr = "mailto:" + addr;
-
-    addr = addr.replace(/./g, function(ch) {
-        if (ch == "@") {
-            // this *must* be encoded. I insist.
-            ch = encode[Math.floor(Math.random()*2)](ch);
-        } else if (ch !=":") {
-            // leave ':' alone (to spot mailto: later)
-            var r = Math.random();
-            // roughly 10% raw, 45% hex, 45% dec
-            ch =  (
-                    r > .9  ?   encode[2](ch)   :
-                    r > .45 ?   encode[1](ch)   :
-                                encode[0](ch)
-                );
-        }
-        return ch;
-    });
-
-    addr = "<a href=\"" + addr + "\">" + addr + "</a>";
-    addr = addr.replace(/">.+:/g,"\">"); // strip the mailto: from the visible part
-
-    return addr;
-}
-
-
-var _UnescapeSpecialChars = function(text) {
-//
-// Swap back in all the special characters we've hidden.
-//
-    text = text.replace(/~E(\d+)E/g,
-        function(wholeMatch,m1) {
-            var charCodeToReplace = parseInt(m1);
-            return String.fromCharCode(charCodeToReplace);
-        }
-    );
-    return text;
-}
-
-
-var _Outdent = function(text) {
-//
-// Remove one level of line-leading tabs or spaces
-//
-
-    // attacklab: hack around Konqueror 3.5.4 bug:
-    // "----------bug".replace(/^-/g,"") == "bug"
-
-    text = text.replace(/^(\t|[ ]{1,4})/gm,"~0"); // attacklab: g_tab_width
-
-    // attacklab: clean up hack
-    text = text.replace(/~0/g,"")
-
-    return text;
-}
-
-var _Detab = function(text) {
-// attacklab: Detab's completely rewritten for speed.
-// In perl we could fix it by anchoring the regexp with \G.
-// In javascript we're less fortunate.
-
-    // expand first n-1 tabs
-    text = text.replace(/\t(?=\t)/g,"    "); // attacklab: g_tab_width
-
-    // replace the nth with two sentinels
-    text = text.replace(/\t/g,"~A~B");
-
-    // use the sentinel to anchor our regex so it doesn't explode
-    text = text.replace(/~B(.+?)~A/g,
-        function(wholeMatch,m1,m2) {
-            var leadingText = m1;
-            var numSpaces = 4 - leadingText.length % 4;  // attacklab: g_tab_width
-
-            // there *must* be a better way to do this:
-            for (var i=0; i<numSpaces; i++) leadingText+=" ";
-
-            return leadingText;
-        }
-    );
-
-    // clean up sentinels
-    text = text.replace(/~A/g,"    ");  // attacklab: g_tab_width
-    text = text.replace(/~B/g,"");
-
-    return text;
-}
-
-
-//
-//  attacklab: Utility functions
-//
-
-
-var escapeCharacters = function(text, charsToEscape, afterBackslash) {
-    // First we have to escape the escape characters so that
-    // we can build a character class out of them
-    var regexString = "([" + charsToEscape.replace(/([\[\]\\])/g,"\\$1") + "])";
-
-    if (afterBackslash) {
-        regexString = "\\\\" + regexString;
-    }
-
-    var regex = new RegExp(regexString,"g");
-    text = text.replace(regex,escapeCharacters_callback);
-
-    return text;
-}
-
-
-var escapeCharacters_callback = function(wholeMatch,m1) {
-    var charCodeToEscape = m1.charCodeAt(0);
-    return "~E"+charCodeToEscape+"E";
-}
-
-} // end of Showdown.converter
-
-
-// export
-if (typeof module !== 'undefined') module.exports = Showdown;
-
-// stolen from AMD branch of underscore
-// AMD define happens at the end for compatibility with AMD loaders
-// that don't enforce next-turn semantics on modules.
-if (typeof define === 'function' && define.amd) {
-    define('showdown', function() {
-        return Showdown;
-    });
-}
-
-
-var Markdown;
-
-if (typeof exports === "object" && typeof require === "function") // we're in a CommonJS (e.g. Node.js) module
-    Markdown = exports;
-else
-    Markdown = {};
-
-// The following text is included for historical reasons, but should
-// be taken with a pinch of salt; it's not all true anymore.
-
-//
-// Wherever possible, Showdown is a straight, line-by-line port
-// of the Perl version of Markdown.
-//
-// This is not a normal parser design; it's basically just a
-// series of string substitutions.  It's hard to read and
-// maintain this way,  but keeping Showdown close to the original
-// design makes it easier to port new features.
-//
-// More importantly, Showdown behaves like markdown.pl in most
-// edge cases.  So web applications can do client-side preview
-// in Javascript, and then build identical HTML on the server.
-//
-// This port needs the new RegExp functionality of ECMA 262,
-// 3rd Edition (i.e. Javascript 1.5).  Most modern web browsers
-// should do fine.  Even with the new regular expression features,
-// We do a lot of work to emulate Perl's regex functionality.
-// The tricky changes in this file mostly have the "attacklab:"
-// label.  Major or self-explanatory changes don't.
-//
-// Smart diff tools like Araxis Merge will be able to match up
-// this file with markdown.pl in a useful way.  A little tweaking
-// helps: in a copy of markdown.pl, replace "#" with "//" and
-// replace "$text" with "text".  Be sure to ignore whitespace
-// and line endings.
-//
-
-
-//
-// Usage:
-//
-//   var text = "Markdown *rocks*.";
-//
-//   var converter = new Markdown.Converter();
-//   var html = converter.makeHtml(text);
-//
-//   alert(html);
-//
-// Note: move the sample code to the bottom of this
-// file before uncommenting it.
-//
-
-(function () {
-
-    function identity(x) { return x; }
-    function returnFalse(x) { return false; }
-
-    function HookCollection() { }
-
-    HookCollection.prototype = {
-
-        chain: function (hookname, func) {
-            var original = this[hookname];
-            if (!original)
-                throw new Error("unknown hook " + hookname);
-
-            if (original === identity)
-                this[hookname] = func;
-            else
-                this[hookname] = function (text) {
-                    var args = Array.prototype.slice.call(arguments, 0);
-                    args[0] = original.apply(null, args);
-                    return func.apply(null, args);
-                };
-        },
-        set: function (hookname, func) {
-            if (!this[hookname])
-                throw new Error("unknown hook " + hookname);
-            this[hookname] = func;
-        },
-        addNoop: function (hookname) {
-            this[hookname] = identity;
-        },
-        addFalse: function (hookname) {
-            this[hookname] = returnFalse;
-        }
-    };
-
-    Markdown.HookCollection = HookCollection;
-
-    // g_urls and g_titles allow arbitrary user-entered strings as keys. This
-    // caused an exception (and hence stopped the rendering) when the user entered
-    // e.g. [push] or [__proto__]. Adding a prefix to the actual key prevents this
-    // (since no builtin property starts with "s_"). See
-    // http://meta.stackoverflow.com/questions/64655/strange-wmd-bug
-    // (granted, switching from Array() to Object() alone would have left only __proto__
-    // to be a problem)
-    function SaveHash() { }
-    SaveHash.prototype = {
-        set: function (key, value) {
-            this["s_" + key] = value;
-        },
-        get: function (key) {
-            return this["s_" + key];
-        }
-    };
-
-    Markdown.Converter = function () {
-        var pluginHooks = this.hooks = new HookCollection();
-
-        // given a URL that was encountered by itself (without markup), should return the link text that's to be given to this link
-        pluginHooks.addNoop("plainLinkText");
-
-        // called with the orignal text as given to makeHtml. The result of this plugin hook is the actual markdown source that will be cooked
-        pluginHooks.addNoop("preConversion");
-
-        // called with the text once all normalizations have been completed (tabs to spaces, line endings, etc.), but before any conversions have
-        pluginHooks.addNoop("postNormalization");
-
-        // Called with the text before / after creating block elements like code blocks and lists. Note that this is called recursively
-        // with inner content, e.g. it's called with the full text, and then only with the content of a blockquote. The inner
-        // call will receive outdented text.
-        pluginHooks.addNoop("preBlockGamut");
-        pluginHooks.addNoop("postBlockGamut");
-
-        // called with the text of a single block element before / after the span-level conversions (bold, code spans, etc.) have been made
-        pluginHooks.addNoop("preSpanGamut");
-        pluginHooks.addNoop("postSpanGamut");
-
-        // called with the final cooked HTML code. The result of this plugin hook is the actual output of makeHtml
-        pluginHooks.addNoop("postConversion");
-
-        //
-        // Private state of the converter instance:
-        //
-
-        // Global hashes, used by various utility routines
-        var g_urls;
-        var g_titles;
-        var g_html_blocks;
-
-        // Used to track when we're inside an ordered or unordered list
-        // (see _ProcessListItems() for details):
-        var g_list_level;
-
-        this.makeHtml = function (text) {
-
-            //
-            // Main function. The order in which other subs are called here is
-            // essential. Link and image substitutions need to happen before
-            // _EscapeSpecialCharsWithinTagAttributes(), so that any *'s or _'s in the <a>
-            // and <img> tags get encoded.
-            //
-
-            // This will only happen if makeHtml on the same converter instance is called from a plugin hook.
-            // Don't do that.
-            if (g_urls)
-                throw new Error("Recursive call to converter.makeHtml");
-
-            // Create the private state objects.
-            g_urls = new SaveHash();
-            g_titles = new SaveHash();
-            g_html_blocks = [];
-            g_list_level = 0;
-
-            text = pluginHooks.preConversion(text);
-
-            // attacklab: Replace ~ with ~T
-            // This lets us use tilde as an escape char to avoid md5 hashes
-            // The choice of character is arbitray; anything that isn't
-            // magic in Markdown will work.
-            text = text.replace(/~/g, "~T");
-
-            // attacklab: Replace $ with ~D
-            // RegExp interprets $ as a special character
-            // when it's in a replacement string
-            text = text.replace(/\$/g, "~D");
-
-            // Standardize line endings
-            text = text.replace(/\r\n/g, "\n"); // DOS to Unix
-            text = text.replace(/\r/g, "\n"); // Mac to Unix
-
-            // Make sure text begins and ends with a couple of newlines:
-            text = "\n\n" + text + "\n\n";
-
-            // Convert all tabs to spaces.
-            text = _Detab(text);
-
-            // Strip any lines consisting only of spaces and tabs.
-            // This makes subsequent regexen easier to write, because we can
-            // match consecutive blank lines with /\n+/ instead of something
-            // contorted like /[ \t]*\n+/ .
-            text = text.replace(/^[ \t]+$/mg, "");
-
-            text = pluginHooks.postNormalization(text);
-
-            // Turn block-level HTML blocks into hash entries
-            text = _HashHTMLBlocks(text);
-
-            // Strip link definitions, store in hashes.
-            text = _StripLinkDefinitions(text);
-
-            text = _RunBlockGamut(text);
-
-            text = _UnescapeSpecialChars(text);
-
-            // attacklab: Restore dollar signs
-            text = text.replace(/~D/g, "$$");
-
-            // attacklab: Restore tildes
-            text = text.replace(/~T/g, "~");
-
-            text = pluginHooks.postConversion(text);
-
-            g_html_blocks = g_titles = g_urls = null;
-
-            return text;
-        };
-
-        function _StripLinkDefinitions(text) {
-            //
-            // Strips link definitions from text, stores the URLs and titles in
-            // hash references.
-            //
-
-            // Link defs are in the form: ^[id]: url "optional title"
-
-            /*
-            text = text.replace(/
-                ^[ ]{0,3}\[(.+)\]:  // id = $1  attacklab: g_tab_width - 1
-                [ \t]*
-                \n?                 // maybe *one* newline
-                [ \t]*
-                <?(\S+?)>?          // url = $2
-                (?=\s|$)            // lookahead for whitespace instead of the lookbehind removed below
-                [ \t]*
-                \n?                 // maybe one newline
-                [ \t]*
-                (                   // (potential) title = $3
-                    (\n*)           // any lines skipped = $4 attacklab: lookbehind removed
-                    [ \t]+
-                    ["(]
-                    (.+?)           // title = $5
-                    [")]
-                    [ \t]*
-                )?                  // title is optional
-                (?:\n+|$)
-            /gm, function(){...});
-            */
-
-            text = text.replace(/^[ ]{0,3}\[(.+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?(?=\s|$)[ \t]*\n?[ \t]*((\n*)["(](.+?)[")][ \t]*)?(?:\n+)/gm,
-                function (wholeMatch, m1, m2, m3, m4, m5) {
-                    m1 = m1.toLowerCase();
-                    g_urls.set(m1, _EncodeAmpsAndAngles(m2));  // Link IDs are case-insensitive
-                    if (m4) {
-                        // Oops, found blank lines, so it's not a title.
-                        // Put back the parenthetical statement we stole.
-                        return m3;
-                    } else if (m5) {
-                        g_titles.set(m1, m5.replace(/"/g, "&quot;"));
-                    }
-
-                    // Completely remove the definition from the text
-                    return "";
-                }
-            );
-
-            return text;
-        }
-
-        function _HashHTMLBlocks(text) {
-
-            // Hashify HTML blocks:
-            // We only want to do this for block-level HTML tags, such as headers,
-            // lists, and tables. That's because we still want to wrap <p>s around
-            // "paragraphs" that are wrapped in non-block-level tags, such as anchors,
-            // phrase emphasis, and spans. The list of tags we're looking for is
-            // hard-coded:
-            var block_tags_a = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del"
-            var block_tags_b = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math"
-
-            // First, look for nested blocks, e.g.:
-            //   <div>
-            //     <div>
-            //     tags for inner block must be indented.
-            //     </div>
-            //   </div>
-            //
-            // The outermost tags must start at the left margin for this to match, and
-            // the inner nested divs must be indented.
-            // We need to do this before the next, more liberal match, because the next
-            // match will start at the first `<div>` and stop at the first `</div>`.
-
-            // attacklab: This regex can be expensive when it fails.
-
-            /*
-            text = text.replace(/
-                (                       // save in $1
-                    ^                   // start of line  (with /m)
-                    <($block_tags_a)    // start tag = $2
-                    \b                  // word break
-                                        // attacklab: hack around khtml/pcre bug...
-                    [^\r]*?\n           // any number of lines, minimally matching
-                    </\2>               // the matching end tag
-                    [ \t]*              // trailing spaces/tabs
-                    (?=\n+)             // followed by a newline
-                )                       // attacklab: there are sentinel newlines at end of document
-            /gm,function(){...}};
-            */
-            text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del)\b[^\r]*?\n<\/\2>[ \t]*(?=\n+))/gm, hashElement);
-
-            //
-            // Now match more liberally, simply from `\n<tag>` to `</tag>\n`
-            //
-
-            /*
-            text = text.replace(/
-                (                       // save in $1
-                    ^                   // start of line  (with /m)
-                    <($block_tags_b)    // start tag = $2
-                    \b                  // word break
-                                        // attacklab: hack around khtml/pcre bug...
-                    [^\r]*?             // any number of lines, minimally matching
-                    .*</\2>             // the matching end tag
-                    [ \t]*              // trailing spaces/tabs
-                    (?=\n+)             // followed by a newline
-                )                       // attacklab: there are sentinel newlines at end of document
-            /gm,function(){...}};
-            */
-            text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math)\b[^\r]*?.*<\/\2>[ \t]*(?=\n+)\n)/gm, hashElement);
-
-            // Special case just for <hr />. It was easier to make a special case than
-            // to make the other regex more complicated.  
-
-            /*
-            text = text.replace(/
-                \n                  // Starting after a blank line
-                [ ]{0,3}
-                (                   // save in $1
-                    (<(hr)          // start tag = $2
-                        \b          // word break
-                        ([^<>])*?
-                    \/?>)           // the matching end tag
-                    [ \t]*
-                    (?=\n{2,})      // followed by a blank line
-                )
-            /g,hashElement);
-            */
-            text = text.replace(/\n[ ]{0,3}((<(hr)\b([^<>])*?\/?>)[ \t]*(?=\n{2,}))/g, hashElement);
-
-            // Special case for standalone HTML comments:
-
-            /*
-            text = text.replace(/
-                \n\n                                            // Starting after a blank line
-                [ ]{0,3}                                        // attacklab: g_tab_width - 1
-                (                                               // save in $1
-                    <!
-                    (--(?:|(?:[^>-]|-[^>])(?:[^-]|-[^-])*)--)   // see http://www.w3.org/TR/html-markup/syntax.html#comments and http://meta.stackoverflow.com/q/95256
-                    >
-                    [ \t]*
-                    (?=\n{2,})                                  // followed by a blank line
-                )
-            /g,hashElement);
-            */
-            text = text.replace(/\n\n[ ]{0,3}(<!(--(?:|(?:[^>-]|-[^>])(?:[^-]|-[^-])*)--)>[ \t]*(?=\n{2,}))/g, hashElement);
-
-            // PHP and ASP-style processor instructions (<?...?> and <%...%>)
-
-            /*
-            text = text.replace(/
-                (?:
-                    \n\n            // Starting after a blank line
-                )
-                (                   // save in $1
-                    [ ]{0,3}        // attacklab: g_tab_width - 1
-                    (?:
-                        <([?%])     // $2
-                        [^\r]*?
-                        \2>
-                    )
-                    [ \t]*
-                    (?=\n{2,})      // followed by a blank line
-                )
-            /g,hashElement);
-            */
-            text = text.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g, hashElement);
-
-            return text;
-        }
-
-        function hashElement(wholeMatch, m1) {
-            var blockText = m1;
-
-            // Undo double lines
-            blockText = blockText.replace(/^\n+/, "");
-
-            // strip trailing blank lines
-            blockText = blockText.replace(/\n+$/g, "");
-
-            // Replace the element text with a marker ("~KxK" where x is its key)
-            blockText = "\n\n~K" + (g_html_blocks.push(blockText) - 1) + "K\n\n";
-
-            return blockText;
-        }
-
-        var blockGamutHookCallback = function (t) { return _RunBlockGamut(t); }
-
-        function _RunBlockGamut(text, doNotUnhash) {
-            //
-            // These are all the transformations that form block-level
-            // tags like paragraphs, headers, and list items.
-            //
-
-            text = pluginHooks.preBlockGamut(text, blockGamutHookCallback);
-
-            text = _DoHeaders(text);
-
-            // Do Horizontal Rules:
-            var replacement = "<hr />\n";
-            text = text.replace(/^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$/gm, replacement);
-            text = text.replace(/^[ ]{0,2}([ ]?-[ ]?){3,}[ \t]*$/gm, replacement);
-            text = text.replace(/^[ ]{0,2}([ ]?_[ ]?){3,}[ \t]*$/gm, replacement);
-
-            text = _DoLists(text);
-            text = _DoCodeBlocks(text);
-            text = _DoBlockQuotes(text);
-
-            text = pluginHooks.postBlockGamut(text, blockGamutHookCallback);
-
-            // We already ran _HashHTMLBlocks() before, in Markdown(), but that
-            // was to escape raw HTML in the original Markdown source. This time,
-            // we're escaping the markup we've just created, so that we don't wrap
-            // <p> tags around block-level tags.
-            text = _HashHTMLBlocks(text);
-            text = _FormParagraphs(text, doNotUnhash);
-
-            return text;
-        }
-
-        function _RunSpanGamut(text) {
-            //
-            // These are all the transformations that occur *within* block-level
-            // tags like paragraphs, headers, and list items.
-            //
-
-            text = pluginHooks.preSpanGamut(text);
-
-            text = _DoCodeSpans(text);
-            text = _EscapeSpecialCharsWithinTagAttributes(text);
-            text = _EncodeBackslashEscapes(text);
-
-            // Process anchor and image tags. Images must come first,
-            // because ![foo][f] looks like an anchor.
-            text = _DoImages(text);
-            text = _DoAnchors(text);
-
-            // Make links out of things like `<http://example.com/>`
-            // Must come after _DoAnchors(), because you can use < and >
-            // delimiters in inline links like [this](<url>).
-            text = _DoAutoLinks(text);
-
-            text = text.replace(/~P/g, "://"); // put in place to prevent autolinking; reset now
-
-            text = _EncodeAmpsAndAngles(text);
-            text = _DoItalicsAndBold(text);
-
-            // Do hard breaks:
-            text = text.replace(/  +\n/g, " <br>\n");
-
-            text = pluginHooks.postSpanGamut(text);
-
-            return text;
-        }
-
-        function _EscapeSpecialCharsWithinTagAttributes(text) {
-            //
-            // Within tags -- meaning between < and > -- encode [\ ` * _] so they
-            // don't conflict with their use in Markdown for code, italics and strong.
-            //
-
-            // Build a regex to find HTML tags and comments.  See Friedl's 
-            // "Mastering Regular Expressions", 2nd Ed., pp. 200-201.
-
-            // SE: changed the comment part of the regex
-
-            var regex = /(<[a-z\/!$]("[^"]*"|'[^']*'|[^'">])*>|<!(--(?:|(?:[^>-]|-[^>])(?:[^-]|-[^-])*)--)>)/gi;
-
-            text = text.replace(regex, function (wholeMatch) {
-                var tag = wholeMatch.replace(/(.)<\/?code>(?=.)/g, "$1`");
-                tag = escapeCharacters(tag, wholeMatch.charAt(1) == "!" ? "\\`*_/" : "\\`*_"); // also escape slashes in comments to prevent autolinking there -- http://meta.stackoverflow.com/questions/95987
-                return tag;
-            });
-
-            return text;
-        }
-
-        function _DoAnchors(text) {
-            //
-            // Turn Markdown link shortcuts into XHTML <a> tags.
-            //
-            //
-            // First, handle reference-style links: [link text] [id]
-            //
-
-            /*
-            text = text.replace(/
-                (                           // wrap whole match in $1
-                    \[
-                    (
-                        (?:
-                            \[[^\]]*\]      // allow brackets nested one level
-                            |
-                            [^\[]           // or anything else
-                        )*
-                    )
-                    \]
-
-                    [ ]?                    // one optional space
-                    (?:\n[ ]*)?             // one optional newline followed by spaces
-
-                    \[
-                    (.*?)                   // id = $3
-                    \]
-                )
-                ()()()()                    // pad remaining backreferences
-            /g, writeAnchorTag);
-            */
-            text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g, writeAnchorTag);
-
-            //
-            // Next, inline-style links: [link text](url "optional title")
-            //
-
-            /*
-            text = text.replace(/
-                (                           // wrap whole match in $1
-                    \[
-                    (
-                        (?:
-                            \[[^\]]*\]      // allow brackets nested one level
-                            |
-                            [^\[\]]         // or anything else
-                        )*
-                    )
-                    \]
-                    \(                      // literal paren
-                    [ \t]*
-                    ()                      // no id, so leave $3 empty
-                    <?(                     // href = $4
-                        (?:
-                            \([^)]*\)       // allow one level of (correctly nested) parens (think MSDN)
-                            |
-                            [^()\s]
-                        )*?
-                    )>?
-                    [ \t]*
-                    (                       // $5
-                        (['"])              // quote char = $6
-                        (.*?)               // Title = $7
-                        \6                  // matching quote
-                        [ \t]*              // ignore any spaces/tabs between closing quote and )
-                    )?                      // title is optional
-                    \)
-                )
-            /g, writeAnchorTag);
-            */
-
-            text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\]\([ \t]*()<?((?:\([^)]*\)|[^()\s])*?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g, writeAnchorTag);
-
-            //
-            // Last, handle reference-style shortcuts: [link text]
-            // These must come last in case you've also got [link test][1]
-            // or [link test](/foo)
-            //
-
-            /*
-            text = text.replace(/
-                (                   // wrap whole match in $1
-                    \[
-                    ([^\[\]]+)      // link text = $2; can't contain '[' or ']'
-                    \]
-                )
-                ()()()()()          // pad rest of backreferences
-            /g, writeAnchorTag);
-            */
-            text = text.replace(/(\[([^\[\]]+)\])()()()()()/g, writeAnchorTag);
-
-            return text;
-        }
-
-        function writeAnchorTag(wholeMatch, m1, m2, m3, m4, m5, m6, m7) {
-            if (m7 == undefined) m7 = "";
-            var whole_match = m1;
-            var link_text = m2.replace(/:\/\//g, "~P"); // to prevent auto-linking withing the link. will be converted back after the auto-linker runs
-            var link_id = m3.toLowerCase();
-            var url = m4;
-            var title = m7;
-
-            if (url == "") {
-                if (link_id == "") {
-                    // lower-case and turn embedded newlines into spaces
-                    link_id = link_text.toLowerCase().replace(/ ?\n/g, " ");
-                }
-                url = "#" + link_id;
-
-                if (g_urls.get(link_id) != undefined) {
-                    url = g_urls.get(link_id);
-                    if (g_titles.get(link_id) != undefined) {
-                        title = g_titles.get(link_id);
-                    }
-                }
-                else {
-                    if (whole_match.search(/\(\s*\)$/m) > -1) {
-                        // Special case for explicit empty url
-                        url = "";
-                    } else {
-                        return whole_match;
-                    }
-                }
-            }
-            url = encodeProblemUrlChars(url);
-            url = escapeCharacters(url, "*_");
-            var result = "<a href=\"" + url + "\"";
-
-            if (title != "") {
-                title = attributeEncode(title);
-                title = escapeCharacters(title, "*_");
-                result += " title=\"" + title + "\"";
-            }
-
-            result += ">" + link_text + "</a>";
-
-            return result;
-        }
-
-        function _DoImages(text) {
-            //
-            // Turn Markdown image shortcuts into <img> tags.
-            //
-
-            //
-            // First, handle reference-style labeled images: ![alt text][id]
-            //
-
-            /*
-            text = text.replace(/
-                (                   // wrap whole match in $1
-                    !\[
-                    (.*?)           // alt text = $2
-                    \]
-
-                    [ ]?            // one optional space
-                    (?:\n[ ]*)?     // one optional newline followed by spaces
-
-                    \[
-                    (.*?)           // id = $3
-                    \]
-                )
-                ()()()()            // pad rest of backreferences
-            /g, writeImageTag);
-            */
-            text = text.replace(/(!\[(.*?)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g, writeImageTag);
-
-            //
-            // Next, handle inline images:  ![alt text](url "optional title")
-            // Don't forget: encode * and _
-
-            /*
-            text = text.replace(/
-                (                   // wrap whole match in $1
-                    !\[
-                    (.*?)           // alt text = $2
-                    \]
-                    \s?             // One optional whitespace character
-                    \(              // literal paren
-                    [ \t]*
-                    ()              // no id, so leave $3 empty
-                    <?(\S+?)>?      // src url = $4
-                    [ \t]*
-                    (               // $5
-                        (['"])      // quote char = $6
-                        (.*?)       // title = $7
-                        \6          // matching quote
-                        [ \t]*
-                    )?              // title is optional
-                    \)
-                )
-            /g, writeImageTag);
-            */
-            text = text.replace(/(!\[(.*?)\]\s?\([ \t]*()<?(\S+?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g, writeImageTag);
-
-            return text;
-        }
-
-        function attributeEncode(text) {
-            // unconditionally replace angle brackets here -- what ends up in an attribute (e.g. alt or title)
-            // never makes sense to have verbatim HTML in it (and the sanitizer would totally break it)
-            return text.replace(/>/g, "&gt;").replace(/</g, "&lt;").replace(/"/g, "&quot;");
-        }
-
-        function writeImageTag(wholeMatch, m1, m2, m3, m4, m5, m6, m7) {
-            var whole_match = m1;
-            var alt_text = m2;
-            var link_id = m3.toLowerCase();
-            var url = m4;
-            var title = m7;
-
-            if (!title) title = "";
-
-            if (url == "") {
-                if (link_id == "") {
-                    // lower-case and turn embedded newlines into spaces
-                    link_id = alt_text.toLowerCase().replace(/ ?\n/g, " ");
-                }
-                url = "#" + link_id;
-
-                if (g_urls.get(link_id) != undefined) {
-                    url = g_urls.get(link_id);
-                    if (g_titles.get(link_id) != undefined) {
-                        title = g_titles.get(link_id);
-                    }
-                }
-                else {
-                    return whole_match;
-                }
-            }
-
-            alt_text = escapeCharacters(attributeEncode(alt_text), "*_[]()");
-            url = escapeCharacters(url, "*_");
-            var result = "<img src=\"" + url + "\" alt=\"" + alt_text + "\"";
-
-            // attacklab: Markdown.pl adds empty title attributes to images.
-            // Replicate this bug.
-
-            //if (title != "") {
-            title = attributeEncode(title);
-            title = escapeCharacters(title, "*_");
-            result += " title=\"" + title + "\"";
-            //}
-
-            result += " />";
-
-            return result;
-        }
-
-        function _DoHeaders(text) {
-
-            // Setext-style headers:
-            //  Header 1
-            //  ========
-            //  
-            //  Header 2
-            //  --------
-            //
-            text = text.replace(/^(.+)[ \t]*\n=+[ \t]*\n+/gm,
-                function (wholeMatch, m1) { return "<h1>" + _RunSpanGamut(m1) + "</h1>\n\n"; }
-            );
-
-            text = text.replace(/^(.+)[ \t]*\n-+[ \t]*\n+/gm,
-                function (matchFound, m1) { return "<h2>" + _RunSpanGamut(m1) + "</h2>\n\n"; }
-            );
-
-            // atx-style headers:
-            //  # Header 1
-            //  ## Header 2
-            //  ## Header 2 with closing hashes ##
-            //  ...
-            //  ###### Header 6
-            //
-
-            /*
-            text = text.replace(/
-                ^(\#{1,6})      // $1 = string of #'s
-                [ \t]*
-                (.+?)           // $2 = Header text
-                [ \t]*
-                \#*             // optional closing #'s (not counted)
-                \n+
-            /gm, function() {...});
-            */
-
-            text = text.replace(/^(\#{1,6})[ \t]*(.+?)[ \t]*\#*\n+/gm,
-                function (wholeMatch, m1, m2) {
-                    var h_level = m1.length;
-                    return "<h" + h_level + ">" + _RunSpanGamut(m2) + "</h" + h_level + ">\n\n";
-                }
-            );
-
-            return text;
-        }
-
-        function _DoLists(text) {
-            //
-            // Form HTML ordered (numbered) and unordered (bulleted) lists.
-            //
-
-            // attacklab: add sentinel to hack around khtml/safari bug:
-            // http://bugs.webkit.org/show_bug.cgi?id=11231
-            text += "~0";
-
-            // Re-usable pattern to match any entirel ul or ol list:
-
-            /*
-            var whole_list = /
-                (                                   // $1 = whole list
-                    (                               // $2
-                        [ ]{0,3}                    // attacklab: g_tab_width - 1
-                        ([*+-]|\d+[.])              // $3 = first list item marker
-                        [ \t]+
-                    )
-                    [^\r]+?
-                    (                               // $4
-                        ~0                          // sentinel for workaround; should be $
-                        |
-                        \n{2,}
-                        (?=\S)
-                        (?!                         // Negative lookahead for another list item marker
-                            [ \t]*
-                            (?:[*+-]|\d+[.])[ \t]+
-                        )
-                    )
-                )
-            /g
-            */
-            var whole_list = /^(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm;
-
-            if (g_list_level) {
-                text = text.replace(whole_list, function (wholeMatch, m1, m2) {
-                    var list = m1;
-                    var list_type = (m2.search(/[*+-]/g) > -1) ? "ul" : "ol";
-
-                    var result = _ProcessListItems(list, list_type);
-
-                    // Trim any trailing whitespace, to put the closing `</$list_type>`
-                    // up on the preceding line, to get it past the current stupid
-                    // HTML block parser. This is a hack to work around the terrible
-                    // hack that is the HTML block parser.
-                    result = result.replace(/\s+$/, "");
-                    result = "<" + list_type + ">" + result + "</" + list_type + ">\n";
-                    return result;
-                });
-            } else {
-                whole_list = /(\n\n|^\n?)(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/g;
-                text = text.replace(whole_list, function (wholeMatch, m1, m2, m3) {
-                    var runup = m1;
-                    var list = m2;
-
-                    var list_type = (m3.search(/[*+-]/g) > -1) ? "ul" : "ol";
-                    var result = _ProcessListItems(list, list_type);
-                    result = runup + "<" + list_type + ">\n" + result + "</" + list_type + ">\n";
-                    return result;
-                });
-            }
-
-            // attacklab: strip sentinel
-            text = text.replace(/~0/, "");
-
-            return text;
-        }
-
-        var _listItemMarkers = { ol: "\\d+[.]", ul: "[*+-]" };
-
-        function _ProcessListItems(list_str, list_type) {
-            //
-            //  Process the contents of a single ordered or unordered list, splitting it
-            //  into individual list items.
-            //
-            //  list_type is either "ul" or "ol".
-
-            // The $g_list_level global keeps track of when we're inside a list.
-            // Each time we enter a list, we increment it; when we leave a list,
-            // we decrement. If it's zero, we're not in a list anymore.
-            //
-            // We do this because when we're not inside a list, we want to treat
-            // something like this:
-            //
-            //    I recommend upgrading to version
-            //    8. Oops, now this line is treated
-            //    as a sub-list.
-            //
-            // As a single paragraph, despite the fact that the second line starts
-            // with a digit-period-space sequence.
-            //
-            // Whereas when we're inside a list (or sub-list), that line will be
-            // treated as the start of a sub-list. What a kludge, huh? This is
-            // an aspect of Markdown's syntax that's hard to parse perfectly
-            // without resorting to mind-reading. Perhaps the solution is to
-            // change the syntax rules such that sub-lists must start with a
-            // starting cardinal number; e.g. "1." or "a.".
-
-            g_list_level++;
-
-            // trim trailing blank lines:
-            list_str = list_str.replace(/\n{2,}$/, "\n");
-
-            // attacklab: add sentinel to emulate \z
-            list_str += "~0";
-
-            // In the original attacklab showdown, list_type was not given to this function, and anything
-            // that matched /[*+-]|\d+[.]/ would just create the next <li>, causing this mismatch:
-            //
-            //  Markdown          rendered by WMD        rendered by MarkdownSharp
-            //  ------------------------------------------------------------------
-            //  1. first          1. first               1. first
-            //  2. second         2. second              2. second
-            //  - third           3. third                   * third
-            //
-            // We changed this to behave identical to MarkdownSharp. This is the constructed RegEx,
-            // with {MARKER} being one of \d+[.] or [*+-], depending on list_type:
-
-            /*
-            list_str = list_str.replace(/
-                (^[ \t]*)                       // leading whitespace = $1
-                ({MARKER}) [ \t]+               // list marker = $2
-                ([^\r]+?                        // list item text   = $3
-                    (\n+)
-                )
-                (?=
-                    (~0 | \2 ({MARKER}) [ \t]+)
-                )
-            /gm, function(){...});
-            */
-
-            var marker = _listItemMarkers[list_type];
-            var re = new RegExp("(^[ \\t]*)(" + marker + ")[ \\t]+([^\\r]+?(\\n+))(?=(~0|\\1(" + marker + ")[ \\t]+))", "gm");
-            var last_item_had_a_double_newline = false;
-            list_str = list_str.replace(re,
-                function (wholeMatch, m1, m2, m3) {
-                    var item = m3;
-                    var leading_space = m1;
-                    var ends_with_double_newline = /\n\n$/.test(item);
-                    var contains_double_newline = ends_with_double_newline || item.search(/\n{2,}/) > -1;
-
-                    if (contains_double_newline || last_item_had_a_double_newline) {
-                        item = _RunBlockGamut(_Outdent(item), /* doNotUnhash = */true);
-                    }
-                    else {
-                        // Recursion for sub-lists:
-                        item = _DoLists(_Outdent(item));
-                        item = item.replace(/\n$/, ""); // chomp(item)
-                        item = _RunSpanGamut(item);
-                    }
-                    last_item_had_a_double_newline = ends_with_double_newline;
-                    return "<li>" + item + "</li>\n";
-                }
-            );
-
-            // attacklab: strip sentinel
-            list_str = list_str.replace(/~0/g, "");
-
-            g_list_level--;
-            return list_str;
-        }
-
-        function _DoCodeBlocks(text) {
-            //
-            //  Process Markdown `<pre><code>` blocks.
-            //  
-
-            /*
-            text = text.replace(/
-                (?:\n\n|^)
-                (                               // $1 = the code block -- one or more lines, starting with a space/tab
-                    (?:
-                        (?:[ ]{4}|\t)           // Lines must start with a tab or a tab-width of spaces - attacklab: g_tab_width
-                        .*\n+
-                    )+
-                )
-                (\n*[ ]{0,3}[^ \t\n]|(?=~0))    // attacklab: g_tab_width
-            /g ,function(){...});
-            */
-
-            // attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug
-            text += "~0";
-
-            text = text.replace(/(?:\n\n|^\n?)((?:(?:[ ]{4}|\t).*\n+)+)(\n*[ ]{0,3}[^ \t\n]|(?=~0))/g,
-                function (wholeMatch, m1, m2) {
-                    var codeblock = m1;
-                    var nextChar = m2;
-
-                    codeblock = _EncodeCode(_Outdent(codeblock));
-                    codeblock = _Detab(codeblock);
-                    codeblock = codeblock.replace(/^\n+/g, ""); // trim leading newlines
-                    codeblock = codeblock.replace(/\n+$/g, ""); // trim trailing whitespace
-
-                    codeblock = "<pre><code>" + codeblock + "\n</code></pre>";
-
-                    return "\n\n" + codeblock + "\n\n" + nextChar;
-                }
-            );
-
-            // attacklab: strip sentinel
-            text = text.replace(/~0/, "");
-
-            return text;
-        }
-
-        function hashBlock(text) {
-            text = text.replace(/(^\n+|\n+$)/g, "");
-            return "\n\n~K" + (g_html_blocks.push(text) - 1) + "K\n\n";
-        }
-
-        function _DoCodeSpans(text) {
-            //
-            // * Backtick quotes are used for <code></code> spans.
-            // 
-            // * You can use multiple backticks as the delimiters if you want to
-            //   include literal backticks in the code span. So, this input:
-            //     
-            //      Just type ``foo `bar` baz`` at the prompt.
-            //     
-            //   Will translate to:
-            //     
-            //      <p>Just type <code>foo `bar` baz</code> at the prompt.</p>
-            //     
-            //   There's no arbitrary limit to the number of backticks you
-            //   can use as delimters. If you need three consecutive backticks
-            //   in your code, use four for delimiters, etc.
-            //
-            // * You can use spaces to get literal backticks at the edges:
-            //     
-            //      ... type `` `bar` `` ...
-            //     
-            //   Turns to:
-            //     
-            //      ... type <code>`bar`</code> ...
-            //
-
-            /*
-            text = text.replace(/
-                (^|[^\\])       // Character before opening ` can't be a backslash
-                (`+)            // $2 = Opening run of `
-                (               // $3 = The code block
-                    [^\r]*?
-                    [^`]        // attacklab: work around lack of lookbehind
-                )
-                \2              // Matching closer
-                (?!`)
-            /gm, function(){...});
-            */
-
-            text = text.replace(/(^|[^\\])(`+)([^\r]*?[^`])\2(?!`)/gm,
-                function (wholeMatch, m1, m2, m3, m4) {
-                    var c = m3;
-                    c = c.replace(/^([ \t]*)/g, ""); // leading whitespace
-                    c = c.replace(/[ \t]*$/g, ""); // trailing whitespace
-                    c = _EncodeCode(c);
-                    c = c.replace(/:\/\//g, "~P"); // to prevent auto-linking. Not necessary in code *blocks*, but in code spans. Will be converted back after the auto-linker runs.
-                    return m1 + "<code>" + c + "</code>";
-                }
-            );
-
-            return text;
-        }
-
-        function _EncodeCode(text) {
-            //
-            // Encode/escape certain characters inside Markdown code runs.
-            // The point is that in code, these characters are literals,
-            // and lose their special Markdown meanings.
-            //
-            // Encode all ampersands; HTML entities are not
-            // entities within a Markdown code span.
-            text = text.replace(/&/g, "&amp;");
-
-            // Do the angle bracket song and dance:
-            text = text.replace(/</g, "&lt;");
-            text = text.replace(/>/g, "&gt;");
-
-            // Now, escape characters that are magic in Markdown:
-            text = escapeCharacters(text, "\*_{}[]\\", false);
-
-            // jj the line above breaks this:
-            //---
-
-            //* Item
-
-            //   1. Subitem
-
-            //            special char: *
-            //---
-
-            return text;
-        }
-
-        function _DoItalicsAndBold(text) {
-
-            // <strong> must go first:
-            text = text.replace(/([\W_]|^)(\*\*|__)(?=\S)([^\r]*?\S[\*_]*)\2([\W_]|$)/g,
-            "$1<strong>$3</strong>$4");
-
-            text = text.replace(/([\W_]|^)(\*|_)(?=\S)([^\r\*_]*?\S)\2([\W_]|$)/g,
-            "$1<em>$3</em>$4");
-
-            return text;
-        }
-
-        function _DoBlockQuotes(text) {
-
-            /*
-            text = text.replace(/
-                (                           // Wrap whole match in $1
-                    (
-                        ^[ \t]*>[ \t]?      // '>' at the start of a line
-                        .+\n                // rest of the first line
-                        (.+\n)*             // subsequent consecutive lines
-                        \n*                 // blanks
-                    )+
-                )
-            /gm, function(){...});
-            */
-
-            text = text.replace(/((^[ \t]*>[ \t]?.+\n(.+\n)*\n*)+)/gm,
-                function (wholeMatch, m1) {
-                    var bq = m1;
-
-                    // attacklab: hack around Konqueror 3.5.4 bug:
-                    // "----------bug".replace(/^-/g,"") == "bug"
-
-                    bq = bq.replace(/^[ \t]*>[ \t]?/gm, "~0"); // trim one level of quoting
-
-                    // attacklab: clean up hack
-                    bq = bq.replace(/~0/g, "");
-
-                    bq = bq.replace(/^[ \t]+$/gm, "");     // trim whitespace-only lines
-                    bq = _RunBlockGamut(bq);             // recurse
-
-                    bq = bq.replace(/(^|\n)/g, "$1  ");
-                    // These leading spaces screw with <pre> content, so we need to fix that:
-                    bq = bq.replace(
-                            /(\s*<pre>[^\r]+?<\/pre>)/gm,
-                        function (wholeMatch, m1) {
-                            var pre = m1;
-                            // attacklab: hack around Konqueror 3.5.4 bug:
-                            pre = pre.replace(/^  /mg, "~0");
-                            pre = pre.replace(/~0/g, "");
-                            return pre;
-                        });
-
-                    return hashBlock("<blockquote>\n" + bq + "\n</blockquote>");
-                }
-            );
-            return text;
-        }
-
-        function _FormParagraphs(text, doNotUnhash) {
-            //
-            //  Params:
-            //    $text - string to process with html <p> tags
-            //
-
-            // Strip leading and trailing lines:
-            text = text.replace(/^\n+/g, "");
-            text = text.replace(/\n+$/g, "");
-
-            var grafs = text.split(/\n{2,}/g);
-            var grafsOut = [];
-
-            var markerRe = /~K(\d+)K/;
-
-            //
-            // Wrap <p> tags.
-            //
-            var end = grafs.length;
-            for (var i = 0; i < end; i++) {
-                var str = grafs[i];
-
-                // if this is an HTML marker, copy it
-                if (markerRe.test(str)) {
-                    grafsOut.push(str);
-                }
-                else if (/\S/.test(str)) {
-                    str = _RunSpanGamut(str);
-                    str = str.replace(/^([ \t]*)/g, "<p>");
-                    str += "</p>"
-                    grafsOut.push(str);
-                }
-
-            }
-            //
-            // Unhashify HTML blocks
-            //
-            if (!doNotUnhash) {
-                end = grafsOut.length;
-                for (var i = 0; i < end; i++) {
-                    var foundAny = true;
-                    while (foundAny) { // we may need several runs, since the data may be nested
-                        foundAny = false;
-                        grafsOut[i] = grafsOut[i].replace(/~K(\d+)K/g, function (wholeMatch, id) {
-                            foundAny = true;
-                            return g_html_blocks[id];
-                        });
-                    }
-                }
-            }
-            return grafsOut.join("\n\n");
-        }
-
-        function _EncodeAmpsAndAngles(text) {
-            // Smart processing for ampersands and angle brackets that need to be encoded.
-
-            // Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin:
-            //   http://bumppo.net/projects/amputator/
-            text = text.replace(/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/g, "&amp;");
-
-            // Encode naked <'s
-            text = text.replace(/<(?![a-z\/?!]|~D)/gi, "&lt;");
-
-            return text;
-        }
-
-        function _EncodeBackslashEscapes(text) {
-            //
-            //   Parameter:  String.
-            //   Returns:    The string, with after processing the following backslash
-            //               escape sequences.
-            //
-
-            // attacklab: The polite way to do this is with the new
-            // escapeCharacters() function:
-            //
-            //     text = escapeCharacters(text,"\\",true);
-            //     text = escapeCharacters(text,"`*_{}[]()>#+-.!",true);
-            //
-            // ...but we're sidestepping its use of the (slow) RegExp constructor
-            // as an optimization for Firefox.  This function gets called a LOT.
-
-            text = text.replace(/\\(\\)/g, escapeCharacters_callback);
-            text = text.replace(/\\([`*_{}\[\]()>#+-.!])/g, escapeCharacters_callback);
-            return text;
-        }
-
-        function handleTrailingParens(wholeMatch, lookbehind, protocol, link) {
-            if (lookbehind)
-                return wholeMatch;
-            if (link.charAt(link.length - 1) !== ")")
-                return "<" + protocol + link + ">";
-            var parens = link.match(/[()]/g);
-            var level = 0;
-            for (var i = 0; i < parens.length; i++) {
-                if (parens[i] === "(") {
-                    if (level <= 0)
-                        level = 1;
-                    else
-                        level++;
-                }
-                else {
-                    level--;
-                }
-            }
-            var tail = "";
-            if (level < 0) {
-                var re = new RegExp("\\){1," + (-level) + "}$");
-                link = link.replace(re, function (trailingParens) {
-                    tail = trailingParens;
-                    return "";
-                });
-            }
-
-            return "<" + protocol + link + ">" + tail;
-        }
-
-        function _DoAutoLinks(text) {
-
-            // note that at this point, all other URL in the text are already hyperlinked as <a href=""></a>
-            // *except* for the <http://www.foo.com> case
-
-            // automatically add < and > around unadorned raw hyperlinks
-            // must be preceded by a non-word character (and not by =" or <) and followed by non-word/EOF character
-            // simulating the lookbehind in a consuming way is okay here, since a URL can neither and with a " nor
-            // with a <, so there is no risk of overlapping matches.
-            text = text.replace(/(="|<)?\b(https?|ftp)(:\/\/[-A-Z0-9+&@#\/%?=~_|\[\]\(\)!:,\.;]*[-A-Z0-9+&@#\/%=~_|\[\])])(?=$|\W)/gi, handleTrailingParens);
-
-            //  autolink anything like <http://example.com>
-
-            var replacer = function (wholematch, m1) { return "<a href=\"" + m1 + "\">" + pluginHooks.plainLinkText(m1) + "</a>"; }
-            text = text.replace(/<((https?|ftp):[^'">\s]+)>/gi, replacer);
-
-            // Email addresses: <address@domain.foo>
-            /*
-            text = text.replace(/
-                <
-                (?:mailto:)?
-                (
-                    [-.\w]+
-                    \@
-                    [-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
-                )
-                >
-            /gi, _DoAutoLinks_callback());
-            */
-
-            /* disabling email autolinking, since we don't do that on the server, either
-            text = text.replace(/<(?:mailto:)?([-.\w]+\@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)>/gi,
-                function(wholeMatch,m1) {
-                    return _EncodeEmailAddress( _UnescapeSpecialChars(m1) );
-                }
-            );
-            */
-            return text;
-        }
-
-        function _UnescapeSpecialChars(text) {
-            //
-            // Swap back in all the special characters we've hidden.
-            //
-            text = text.replace(/~E(\d+)E/g,
-                function (wholeMatch, m1) {
-                    var charCodeToReplace = parseInt(m1);
-                    return String.fromCharCode(charCodeToReplace);
-                }
-            );
-            return text;
-        }
-
-        function _Outdent(text) {
-            //
-            // Remove one level of line-leading tabs or spaces
-            //
-
-            // attacklab: hack around Konqueror 3.5.4 bug:
-            // "----------bug".replace(/^-/g,"") == "bug"
-
-            text = text.replace(/^(\t|[ ]{1,4})/gm, "~0"); // attacklab: g_tab_width
-
-            // attacklab: clean up hack
-            text = text.replace(/~0/g, "")
-
-            return text;
-        }
-
-        function _Detab(text) {
-            if (!/\t/.test(text))
-                return text;
-
-            var spaces = ["    ", "   ", "  ", " "],
-            skew = 0,
-            v;
-
-            return text.replace(/[\n\t]/g, function (match, offset) {
-                if (match === "\n") {
-                    skew = offset + 1;
-                    return match;
-                }
-                v = (offset - skew) % 4;
-                skew = offset + 1;
-                return spaces[v];
-            });
-        }
-
-        //
-        //  attacklab: Utility functions
-        //
-
-        var _problemUrlChars = /(?:["'*()[\]:]|~D)/g;
-
-        // hex-encodes some unusual "problem" chars in URLs to avoid URL detection problems 
-        function encodeProblemUrlChars(url) {
-            if (!url)
-                return "";
-
-            var len = url.length;
-
-            return url.replace(_problemUrlChars, function (match, offset) {
-                if (match == "~D") // escape for dollar
-                    return "%24";
-                if (match == ":") {
-                    if (offset == len - 1 || /[0-9\/]/.test(url.charAt(offset + 1)))
-                        return ":"
-                }
-                return "%" + match.charCodeAt(0).toString(16);
-            });
-        }
-
-
-        function escapeCharacters(text, charsToEscape, afterBackslash) {
-            // First we have to escape the escape characters so that
-            // we can build a character class out of them
-            var regexString = "([" + charsToEscape.replace(/([\[\]\\])/g, "\\$1") + "])";
-
-            if (afterBackslash) {
-                regexString = "\\\\" + regexString;
-            }
-
-            var regex = new RegExp(regexString, "g");
-            text = text.replace(regex, escapeCharacters_callback);
-
-            return text;
-        }
-
-
-        function escapeCharacters_callback(wholeMatch, m1) {
-            var charCodeToEscape = m1.charCodeAt(0);
-            return "~E" + charCodeToEscape + "E";
-        }
-
-    }; // end of the Markdown.Converter constructor
-
-})();
-
-(function () {
-    var output, Converter;
-    if (typeof exports === "object" && typeof require === "function") { // we're in a CommonJS (e.g. Node.js) module
-        output = exports;
-        Converter = require("./Markdown.Converter").Converter;
-    } else {
-        output = window.Markdown;
-        Converter = output.Converter;
-    }
-
-    output.getSanitizingConverter = function () {
-        var converter = new Converter();
-        converter.hooks.chain("postConversion", sanitizeHtml);
-        converter.hooks.chain("postConversion", balanceTags);
-        return converter;
-    }
-
-    function sanitizeHtml(html) {
-        return html.replace(/<[^>]*>?/gi, sanitizeTag);
-    }
-
-    // (tags that can be opened/closed) | (tags that stand alone)
-    var basic_tag_whitelist = /^(<\/?(b|blockquote|code|del|dd|dl|dt|em|h1|h2|h3|i|kbd|li|ol|p|pre|s|sup|sub|strong|strike|ul)>|<(br|hr)\s?\/?>)$/i;
-    // <a href="url..." optional title>|</a>
-    var a_white = /^(<a\shref="((https?|ftp):\/\/|\/)[-A-Za-z0-9+&@#\/%?=~_|!:,.;\(\)]+"(\stitle="[^"<>]+")?\s?>|<\/a>)$/i;
-
-    // <img src="url..." optional width  optional height  optional alt  optional title
-    var img_white = /^(<img\ssrc="(https?:\/\/|\/)[-A-Za-z0-9+&@#\/%?=~_|!:,.;\(\)]+"(\swidth="\d{1,3}")?(\sheight="\d{1,3}")?(\salt="[^"<>]*")?(\stitle="[^"<>]*")?\s?\/?>)$/i;
-
-    function sanitizeTag(tag) {
-        if (tag.match(basic_tag_whitelist) || tag.match(a_white) || tag.match(img_white))
-            return tag;
-        else
-            return "";
-    }
-
-    /// <summary>
-    /// attempt to balance HTML tags in the html string
-    /// by removing any unmatched opening or closing tags
-    /// IMPORTANT: we *assume* HTML has *already* been 
-    /// sanitized and is safe/sane before balancing!
-    /// 
-    /// adapted from CODESNIPPET: A8591DBA-D1D3-11DE-947C-BA5556D89593
-    /// </summary>
-    function balanceTags(html) {
-
-        if (html == "")
-            return "";
-
-        var re = /<\/?\w+[^>]*(\s|$|>)/g;
-        // convert everything to lower case; this makes
-        // our case insensitive comparisons easier
-        var tags = html.toLowerCase().match(re);
-
-        // no HTML tags present? nothing to do; exit now
-        var tagcount = (tags || []).length;
-        if (tagcount == 0)
-            return html;
-
-        var tagname, tag;
-        var ignoredtags = "<p><img><br><li><hr>";
-        var match;
-        var tagpaired = [];
-        var tagremove = [];
-        var needsRemoval = false;
-
-        // loop through matched tags in forward order
-        for (var ctag = 0; ctag < tagcount; ctag++) {
-            tagname = tags[ctag].replace(/<\/?(\w+).*/, "$1");
-            // skip any already paired tags
-            // and skip tags in our ignore list; assume they're self-closed
-            if (tagpaired[ctag] || ignoredtags.search("<" + tagname + ">") > -1)
-                continue;
-
-            tag = tags[ctag];
-            match = -1;
-
-            if (!/^<\//.test(tag)) {
-                // this is an opening tag
-                // search forwards (next tags), look for closing tags
-                for (var ntag = ctag + 1; ntag < tagcount; ntag++) {
-                    if (!tagpaired[ntag] && tags[ntag] == "</" + tagname + ">") {
-                        match = ntag;
-                        break;
-                    }
-                }
-            }
-
-            if (match == -1)
-                needsRemoval = tagremove[ctag] = true; // mark for removal
-            else
-                tagpaired[match] = true; // mark paired
-        }
-
-        if (!needsRemoval)
-            return html;
-
-        // delete all orphaned tags from the string
-
-        var ctag = 0;
-        html = html.replace(re, function (match) {
-            var res = tagremove[ctag] ? "" : match;
-            ctag++;
-            return res;
-        });
-        return html;
-    }
-})();
-
-// needs Markdown.Converter.js at the moment
-
-(function () {
-
-    var util = {},
-        position = {},
-        ui = {},
-        doc = window.document,
-        re = window.RegExp,
-        nav = window.navigator,
-        SETTINGS = { lineLength: 72 },
-
-    // Used to work around some browser bugs where we can't use feature testing.
-        uaSniffed = {
-            isIE: /msie/.test(nav.userAgent.toLowerCase()),
-            isIE_5or6: /msie 6/.test(nav.userAgent.toLowerCase()) || /msie 5/.test(nav.userAgent.toLowerCase()),
-            isOpera: /opera/.test(nav.userAgent.toLowerCase())
-        };
-
-    var defaultsStrings = {
-        bold: "Strong <strong> Ctrl+B",
-        boldexample: "strong text",
-
-        italic: "Emphasis <em> Ctrl+I",
-        italicexample: "emphasized text",
-
-        link: "Hyperlink <a> Ctrl+L",
-        linkdescription: "enter link description here",
-        linkdialog: "<p><b>Insert Hyperlink</b></p><p>http://example.com/ \"optional title\"</p>",
-        linkname: null,
-
-        quote: "Blockquote <blockquote> Ctrl+Q",
-        quoteexample: "Blockquote",
-
-        code: "Code Sample <pre><code> Ctrl+K",
-        codeexample: "enter code here",
-
-        image: "Image <img> Ctrl+G",
-        imagedescription: "enter image description here",
-        imagedialog: "<p><b>Insert Image</b></p><p>http://example.com/images/diagram.jpg \"optional title\"<br>Need <a href='http://www.google.com/search?q=free+image+hosting' target='_blank'>free image hosting?</a></p>",
-        imagename: null,
-
-        olist: "Numbered List <ol> Ctrl+O",
-        ulist: "Bulleted List <ul> Ctrl+U",
-        litem: "List item",
-
-        heading: "Heading <h1>/<h2> Ctrl+H",
-        headingexample: "Heading",
-        more: "More contents <!--more--> Ctrl+M",
-
-        fullscreen: 'FullScreen Ctrl+J',
-        exitFullscreen: 'Exit FullScreen Ctrl+E',
-        fullscreenUnsupport: 'Sorry, the browser dont support fullscreen api',
-
-        hr: "Horizontal Rule <hr> Ctrl+R",
-
-        undo: "Undo - Ctrl+Z",
-        redo: "Redo - Ctrl+Y",
-        redomac: "Redo - Ctrl+Shift+Z",
-
-        ok: "OK",
-        cancel: "Cancel",
-
-        help: "Markdown Editing Help"
-    };
-
-
-    // -------------------------------------------------------------------
-    //  YOUR CHANGES GO HERE
-    //
-    // I've tried to localize the things you are likely to change to
-    // this area.
-    // -------------------------------------------------------------------
-
-    // The default text that appears in the dialog input box when entering
-    // links.
-    var imageDefaultText = "http://";
-    var linkDefaultText = "http://";
-
-    // -------------------------------------------------------------------
-    //  END OF YOUR CHANGES
-    // -------------------------------------------------------------------
-
-    // options, if given, can have the following properties:
-    //   options.helpButton = { handler: yourEventHandler }
-    //   options.strings = { italicexample: "slanted text" }
-    // `yourEventHandler` is the click handler for the help button.
-    // If `options.helpButton` isn't given, not help button is created.
-    // `options.strings` can have any or all of the same properties as
-    // `defaultStrings` above, so you can just override some string displayed
-    // to the user on a case-by-case basis, or translate all strings to
-    // a different language.
-    //
-    // For backwards compatibility reasons, the `options` argument can also
-    // be just the `helpButton` object, and `strings.help` can also be set via
-    // `helpButton.title`. This should be considered legacy.
-    //
-    // The constructed editor object has the methods:
-    // - getConverter() returns the markdown converter object that was passed to the constructor
-    // - run() actually starts the editor; should be called after all necessary plugins are registered. Calling this more than once is a no-op.
-    // - refreshPreview() forces the preview to be updated. This method is only available after run() was called.
-    Markdown.Editor = function (markdownConverter, idPostfix, options) {
-
-        options = options || {};
-
-        if (typeof options.handler === "function") { //backwards compatible behavior
-            options = { helpButton: options };
-        }
-        options.strings = options.strings || {};
-        if (options.helpButton) {
-            options.strings.help = options.strings.help || options.helpButton.title;
-        }
-        var getString = function (identifier) {
-            var string = options.strings[identifier] || defaultsStrings[identifier];
-
-            if ('imagename' == identifier || 'linkname' == identifier) {
-                options.strings[identifier] = null;
-            }
-
-            return string;
-        }
-
-        idPostfix = idPostfix || "";
-
-        var hooks = this.hooks = new Markdown.HookCollection();
-        hooks.addNoop("onPreviewRefresh");       // called with no arguments after the preview has been refreshed
-        hooks.addNoop("postBlockquoteCreation"); // called with the user's selection *after* the blockquote was created; should return the actual to-be-inserted text
-        hooks.addFalse("insertImageDialog");     /* called with one parameter: a callback to be called with the URL of the image. If the application creates
-                                                  * its own image insertion dialog, this hook should return true, and the callback should be called with the chosen
-                                                  * image url (or null if the user cancelled). If this hook returns false, the default dialog will be used.
-                                                  */
-        hooks.addFalse("insertLinkDialog");     /* called with one parameter: a callback to be called with the URL of the image. If the application creates
-                                                  * its own image insertion dialog, this hook should return true, and the callback should be called with the chosen
-                                                  * image url (or null if the user cancelled). If this hook returns false, the default dialog will be used.
-                                                  */
-        hooks.addNoop("enterFullScreen");
-        hooks.addNoop("enterFakeFullScreen");
-        hooks.addNoop("exitFullScreen");
-
-        this.getConverter = function () { return markdownConverter; }
-
-        var that = this,
-            panels;
-
-        this.run = function () {
-            if (panels)
-                return; // already initialized
-
-            panels = new PanelCollection(idPostfix);
-            var commandManager = new CommandManager(hooks, getString);
-            var previewManager = new PreviewManager(markdownConverter, panels, function () { hooks.onPreviewRefresh(); });
-            var undoManager, uiManager;
-
-            if (!/\?noundo/.test(doc.location.href)) {
-                undoManager = new UndoManager(function () {
-                    previewManager.refresh();
-                    if (uiManager) // not available on the first call
-                        uiManager.setUndoRedoButtonStates();
-                }, panels);
-                this.textOperation = function (f) {
-                    undoManager.setCommandMode();
-                    f();
-                    that.refreshPreview();
-                }
-            }
-            
-            fullScreenManager = new FullScreenManager(hooks, getString);
-            uiManager = new UIManager(idPostfix, panels, undoManager, previewManager, commandManager, fullScreenManager, options.helpButton, getString);
-            uiManager.setUndoRedoButtonStates();
-
-            var forceRefresh = that.refreshPreview = function () { previewManager.refresh(true); };
-
-            forceRefresh();
-        };
-
-    }
-
-    // before: contains all the text in the input box BEFORE the selection.
-    // after: contains all the text in the input box AFTER the selection.
-    function Chunks() { }
-
-    // startRegex: a regular expression to find the start tag
-    // endRegex: a regular expresssion to find the end tag
-    Chunks.prototype.findTags = function (startRegex, endRegex) {
-
-        var chunkObj = this;
-        var regex;
-
-        if (startRegex) {
-
-            regex = util.extendRegExp(startRegex, "", "$");
-
-            this.before = this.before.replace(regex,
-                function (match) {
-                    chunkObj.startTag = chunkObj.startTag + match;
-                    return "";
-                });
-
-            regex = util.extendRegExp(startRegex, "^", "");
-
-            this.selection = this.selection.replace(regex,
-                function (match) {
-                    chunkObj.startTag = chunkObj.startTag + match;
-                    return "";
-                });
-        }
-
-        if (endRegex) {
-
-            regex = util.extendRegExp(endRegex, "", "$");
-
-            this.selection = this.selection.replace(regex,
-                function (match) {
-                    chunkObj.endTag = match + chunkObj.endTag;
-                    return "";
-                });
-
-            regex = util.extendRegExp(endRegex, "^", "");
-
-            this.after = this.after.replace(regex,
-                function (match) {
-                    chunkObj.endTag = match + chunkObj.endTag;
-                    return "";
-                });
-        }
-    };
-
-    // If remove is false, the whitespace is transferred
-    // to the before/after regions.
-    //
-    // If remove is true, the whitespace disappears.
-    Chunks.prototype.trimWhitespace = function (remove) {
-        var beforeReplacer, afterReplacer, that = this;
-        if (remove) {
-            beforeReplacer = afterReplacer = "";
-        } else {
-            beforeReplacer = function (s) { that.before += s; return ""; }
-            afterReplacer = function (s) { that.after = s + that.after; return ""; }
-        }
-
-        this.selection = this.selection.replace(/^(\s*)/, beforeReplacer).replace(/(\s*)$/, afterReplacer);
-    };
-
-
-    Chunks.prototype.skipLines = function (nLinesBefore, nLinesAfter, findExtraNewlines) {
-
-        if (nLinesBefore === undefined) {
-            nLinesBefore = 1;
-        }
-
-        if (nLinesAfter === undefined) {
-            nLinesAfter = 1;
-        }
-
-        nLinesBefore++;
-        nLinesAfter++;
-
-        var regexText;
-        var replacementText;
-
-        // chrome bug ... documented at: http://meta.stackoverflow.com/questions/63307/blockquote-glitch-in-editor-in-chrome-6-and-7/65985#65985
-        if (navigator.userAgent.match(/Chrome/)) {
-            "X".match(/()./);
-        }
-
-        this.selection = this.selection.replace(/(^\n*)/, "");
-
-        this.startTag = this.startTag + re.$1;
-
-        this.selection = this.selection.replace(/(\n*$)/, "");
-        this.endTag = this.endTag + re.$1;
-        this.startTag = this.startTag.replace(/(^\n*)/, "");
-        this.before = this.before + re.$1;
-        this.endTag = this.endTag.replace(/(\n*$)/, "");
-        this.after = this.after + re.$1;
-
-        if (this.before) {
-
-            regexText = replacementText = "";
-
-            while (nLinesBefore--) {
-                regexText += "\\n?";
-                replacementText += "\n";
-            }
-
-            if (findExtraNewlines) {
-                regexText = "\\n*";
-            }
-            this.before = this.before.replace(new re(regexText + "$", ""), replacementText);
-        }
-
-        if (this.after) {
-
-            regexText = replacementText = "";
-
-            while (nLinesAfter--) {
-                regexText += "\\n?";
-                replacementText += "\n";
-            }
-            if (findExtraNewlines) {
-                regexText = "\\n*";
-            }
-
-            this.after = this.after.replace(new re(regexText, ""), replacementText);
-        }
-    };
-
-    // end of Chunks
-
-    // A collection of the important regions on the page.
-    // Cached so we don't have to keep traversing the DOM.
-    // Also holds ieCachedRange and ieCachedScrollTop, where necessary; working around
-    // this issue:
-    // Internet explorer has problems with CSS sprite buttons that use HTML
-    // lists.  When you click on the background image "button", IE will
-    // select the non-existent link text and discard the selection in the
-    // textarea.  The solution to this is to cache the textarea selection
-    // on the button's mousedown event and set a flag.  In the part of the
-    // code where we need to grab the selection, we check for the flag
-    // and, if it's set, use the cached area instead of querying the
-    // textarea.
-    //
-    // This ONLY affects Internet Explorer (tested on versions 6, 7
-    // and 8) and ONLY on button clicks.  Keyboard shortcuts work
-    // normally since the focus never leaves the textarea.
-    function PanelCollection(postfix) {
-        this.buttonBar = doc.getElementById("wmd-button-bar" + postfix);
-        this.preview = doc.getElementById("wmd-preview" + postfix);
-        this.input = doc.getElementById("text");
-    };
-
-    // Returns true if the DOM element is visible, false if it's hidden.
-    // Checks if display is anything other than none.
-    util.isVisible = function (elem) {
-
-        if (window.getComputedStyle) {
-            // Most browsers
-            return window.getComputedStyle(elem, null).getPropertyValue("display") !== "none";
-        }
-        else if (elem.currentStyle) {
-            // IE
-            return elem.currentStyle["display"] !== "none";
-        }
-    };
-
-
-    // Adds a listener callback to a DOM element which is fired on a specified
-    // event.
-    util.addEvent = function (elem, event, listener) {
-        if (elem.attachEvent) {
-            // IE only.  The "on" is mandatory.
-            elem.attachEvent("on" + event, listener);
-        }
-        else {
-            // Other browsers.
-            elem.addEventListener(event, listener, false);
-        }
-    };
-
-
-    // Removes a listener callback from a DOM element which is fired on a specified
-    // event.
-    util.removeEvent = function (elem, event, listener) {
-        if (elem.detachEvent) {
-            // IE only.  The "on" is mandatory.
-            elem.detachEvent("on" + event, listener);
-        }
-        else {
-            // Other browsers.
-            elem.removeEventListener(event, listener, false);
-        }
-    };
-
-    // Converts \r\n and \r to \n.
-    util.fixEolChars = function (text) {
-        text = text.replace(/\r\n/g, "\n");
-        text = text.replace(/\r/g, "\n");
-        return text;
-    };
-
-    // Extends a regular expression.  Returns a new RegExp
-    // using pre + regex + post as the expression.
-    // Used in a few functions where we have a base
-    // expression and we want to pre- or append some
-    // conditions to it (e.g. adding "$" to the end).
-    // The flags are unchanged.
-    //
-    // regex is a RegExp, pre and post are strings.
-    util.extendRegExp = function (regex, pre, post) {
-
-        if (pre === null || pre === undefined) {
-            pre = "";
-        }
-        if (post === null || post === undefined) {
-            post = "";
-        }
-
-        var pattern = regex.toString();
-        var flags;
-
-        // Replace the flags with empty space and store them.
-        pattern = pattern.replace(/\/([gim]*)$/, function (wholeMatch, flagsPart) {
-            flags = flagsPart;
-            return "";
-        });
-
-        // Remove the slash delimiters on the regular expression.
-        pattern = pattern.replace(/(^\/|\/$)/g, "");
-        pattern = pre + pattern + post;
-
-        return new re(pattern, flags);
-    }
-
-    // UNFINISHED
-    // The assignment in the while loop makes jslint cranky.
-    // I'll change it to a better loop later.
-    position.getTop = function (elem, isInner) {
-        var result = elem.offsetTop;
-        if (!isInner) {
-            while (elem = elem.offsetParent) {
-                result += elem.offsetTop;
-            }
-        }
-        return result;
-    };
-
-    position.getHeight = function (elem) {
-        return elem.offsetHeight || elem.scrollHeight;
-    };
-
-    position.getWidth = function (elem) {
-        return elem.offsetWidth || elem.scrollWidth;
-    };
-
-    position.getPageSize = function () {
-
-        var scrollWidth, scrollHeight;
-        var innerWidth, innerHeight;
-
-        // It's not very clear which blocks work with which browsers.
-        if (self.innerHeight && self.scrollMaxY) {
-            scrollWidth = doc.body.scrollWidth;
-            scrollHeight = self.innerHeight + self.scrollMaxY;
-        }
-        else if (doc.body.scrollHeight > doc.body.offsetHeight) {
-            scrollWidth = doc.body.scrollWidth;
-            scrollHeight = doc.body.scrollHeight;
-        }
-        else {
-            scrollWidth = doc.body.offsetWidth;
-            scrollHeight = doc.body.offsetHeight;
-        }
-
-        if (self.innerHeight) {
-            // Non-IE browser
-            innerWidth = self.innerWidth;
-            innerHeight = self.innerHeight;
-        }
-        else if (doc.documentElement && doc.documentElement.clientHeight) {
-            // Some versions of IE (IE 6 w/ a DOCTYPE declaration)
-            innerWidth = doc.documentElement.clientWidth;
-            innerHeight = doc.documentElement.clientHeight;
-        }
-        else if (doc.body) {
-            // Other versions of IE
-            innerWidth = doc.body.clientWidth;
-            innerHeight = doc.body.clientHeight;
-        }
-
-        var maxWidth = Math.max(scrollWidth, innerWidth);
-        var maxHeight = Math.max(scrollHeight, innerHeight);
-        return [maxWidth, maxHeight, innerWidth, innerHeight];
-    };
-
-    // Handles pushing and popping TextareaStates for undo/redo commands.
-    // I should rename the stack variables to list.
-    function UndoManager(callback, panels) {
-
-        var undoObj = this;
-        var undoStack = []; // A stack of undo states
-        var stackPtr = 0; // The index of the current state
-        var mode = "none";
-        var lastState; // The last state
-        var timer; // The setTimeout handle for cancelling the timer
-        var inputStateObj;
-
-        // Set the mode for later logic steps.
-        var setMode = function (newMode, noSave) {
-            if (mode != newMode) {
-                mode = newMode;
-                if (!noSave) {
-                    saveState();
-                }
-            }
-
-            if (!uaSniffed.isIE || mode != "moving") {
-                timer = setTimeout(refreshState, 1);
-            }
-            else {
-                inputStateObj = null;
-            }
-        };
-
-        var refreshState = function (isInitialState) {
-            inputStateObj = new TextareaState(panels, isInitialState);
-            timer = undefined;
-        };
-
-        this.setCommandMode = function () {
-            mode = "command";
-            saveState();
-            timer = setTimeout(refreshState, 0);
-        };
-
-        this.canUndo = function () {
-            return stackPtr > 1;
-        };
-
-        this.canRedo = function () {
-            if (undoStack[stackPtr + 1]) {
-                return true;
-            }
-            return false;
-        };
-
-        // Removes the last state and restores it.
-        this.undo = function () {
-
-            if (undoObj.canUndo()) {
-                if (lastState) {
-                    // What about setting state -1 to null or checking for undefined?
-                    lastState.restore();
-                    lastState = null;
-                }
-                else {
-                    undoStack[stackPtr] = new TextareaState(panels);
-                    undoStack[--stackPtr].restore();
-
-                    if (callback) {
-                        callback();
-                    }
-                }
-            }
-
-            mode = "none";
-            panels.input.focus();
-            refreshState();
-        };
-
-        // Redo an action.
-        this.redo = function () {
-
-            if (undoObj.canRedo()) {
-
-                undoStack[++stackPtr].restore();
-
-                if (callback) {
-                    callback();
-                }
-            }
-
-            mode = "none";
-            panels.input.focus();
-            refreshState();
-        };
-
-        // Push the input area state to the stack.
-        var saveState = function () {
-            var currState = inputStateObj || new TextareaState(panels);
-
-            if (!currState) {
-                return false;
-            }
-            if (mode == "moving") {
-                if (!lastState) {
-                    lastState = currState;
-                }
-                return;
-            }
-            if (lastState) {
-                if (undoStack[stackPtr - 1].text != lastState.text) {
-                    undoStack[stackPtr++] = lastState;
-                }
-                lastState = null;
-            }
-            undoStack[stackPtr++] = currState;
-            undoStack[stackPtr + 1] = null;
-            if (callback) {
-                callback();
-            }
-        };
-
-        var handleCtrlYZ = function (event) {
-
-            var handled = false;
-
-            if ((event.ctrlKey || event.metaKey) && !event.altKey) {
-
-                // IE and Opera do not support charCode.
-                var keyCode = event.charCode || event.keyCode;
-                var keyCodeChar = String.fromCharCode(keyCode);
-
-                switch (keyCodeChar.toLowerCase()) {
-
-                    case "y":
-                        undoObj.redo();
-                        handled = true;
-                        break;
-
-                    case "z":
-                        if (!event.shiftKey) {
-                            undoObj.undo();
-                        }
-                        else {
-                            undoObj.redo();
-                        }
-                        handled = true;
-                        break;
-                }
-            }
-
-            if (handled) {
-                if (event.preventDefault) {
-                    event.preventDefault();
-                }
-                if (window.event) {
-                    window.event.returnValue = false;
-                }
-                return;
-            }
-        };
-
-        // Set the mode depending on what is going on in the input area.
-        var handleModeChange = function (event) {
-
-            if (!event.ctrlKey && !event.metaKey) {
-
-                var keyCode = event.keyCode;
-
-                if ((keyCode >= 33 && keyCode <= 40) || (keyCode >= 63232 && keyCode <= 63235)) {
-                    // 33 - 40: page up/dn and arrow keys
-                    // 63232 - 63235: page up/dn and arrow keys on safari
-                    setMode("moving");
-                }
-                else if (keyCode == 8 || keyCode == 46 || keyCode == 127) {
-                    // 8: backspace
-                    // 46: delete
-                    // 127: delete
-                    setMode("deleting");
-                }
-                else if (keyCode == 13) {
-                    // 13: Enter
-                    setMode("newlines");
-                }
-                else if (keyCode == 27) {
-                    // 27: escape
-                    setMode("escape");
-                }
-                else if ((keyCode < 16 || keyCode > 20) && keyCode != 91) {
-                    // 16-20 are shift, etc.
-                    // 91: left window key
-                    // I think this might be a little messed up since there are
-                    // a lot of nonprinting keys above 20.
-                    setMode("typing");
-                }
-            }
-        };
-
-        var setEventHandlers = function () {
-            util.addEvent(panels.input, "keypress", function (event) {
-                // keyCode 89: y
-                // keyCode 90: z
-                if ((event.ctrlKey || event.metaKey) && !event.altKey && (event.keyCode == 89 || event.keyCode == 90)) {
-                    event.preventDefault();
-                }
-            });
-
-            var handlePaste = function () {
-                if (uaSniffed.isIE || (inputStateObj && inputStateObj.text != panels.input.value)) {
-                    if (timer == undefined) {
-                        mode = "paste";
-                        saveState();
-                        refreshState();
-                    }
-                }
-            };
-
-            util.addEvent(panels.input, "keydown", handleCtrlYZ);
-            util.addEvent(panels.input, "keydown", handleModeChange);
-            util.addEvent(panels.input, "mousedown", function () {
-                setMode("moving");
-            });
-
-            panels.input.onpaste = handlePaste;
-            panels.input.ondrop = handlePaste;
-        };
-
-        var init = function () {
-            setEventHandlers();
-            refreshState(true);
-            saveState();
-        };
-
-        init();
-    }
-
-    // end of UndoManager
-
-    // The input textarea state/contents.
-    // This is used to implement undo/redo by the undo manager.
-    function TextareaState(panels, isInitialState) {
-
-        // Aliases
-        var stateObj = this;
-        var inputArea = panels.input;
-        this.init = function () {
-            if (!util.isVisible(inputArea)) {
-                return;
-            }
-            if (!isInitialState && doc.activeElement && doc.activeElement !== inputArea) { // this happens when tabbing out of the input box
-                return;
-            }
-
-            this.setInputAreaSelectionStartEnd();
-            this.scrollTop = inputArea.scrollTop;
-            if (!this.text && inputArea.selectionStart || inputArea.selectionStart === 0) {
-                this.text = inputArea.value;
-            }
-
-        }
-
-        // Sets the selected text in the input box after we've performed an
-        // operation.
-        this.setInputAreaSelection = function () {
-
-            if (!util.isVisible(inputArea)) {
-                return;
-            }
-
-            if (inputArea.selectionStart !== undefined && !uaSniffed.isOpera) {
-
-                inputArea.focus();
-                inputArea.selectionStart = stateObj.start;
-                inputArea.selectionEnd = stateObj.end;
-                inputArea.scrollTop = stateObj.scrollTop;
-            }
-            else if (doc.selection) {
-
-                if (doc.activeElement && doc.activeElement !== inputArea) {
-                    return;
-                }
-
-                inputArea.focus();
-                var range = inputArea.createTextRange();
-                range.moveStart("character", -inputArea.value.length);
-                range.moveEnd("character", -inputArea.value.length);
-                range.moveEnd("character", stateObj.end);
-                range.moveStart("character", stateObj.start);
-                range.select();
-            }
-        };
-
-        this.setInputAreaSelectionStartEnd = function () {
-
-            if (!panels.ieCachedRange && (inputArea.selectionStart || inputArea.selectionStart === 0)) {
-
-                stateObj.start = inputArea.selectionStart;
-                stateObj.end = inputArea.selectionEnd;
-            }
-            else if (doc.selection) {
-
-                stateObj.text = util.fixEolChars(inputArea.value);
-
-                // IE loses the selection in the textarea when buttons are
-                // clicked.  On IE we cache the selection. Here, if something is cached,
-                // we take it.
-                var range = panels.ieCachedRange || doc.selection.createRange();
-
-                var fixedRange = util.fixEolChars(range.text);
-                var marker = "\x07";
-                var markedRange = marker + fixedRange + marker;
-                range.text = markedRange;
-                var inputText = util.fixEolChars(inputArea.value);
-
-                range.moveStart("character", -markedRange.length);
-                range.text = fixedRange;
-
-                stateObj.start = inputText.indexOf(marker);
-                stateObj.end = inputText.lastIndexOf(marker) - marker.length;
-
-                var len = stateObj.text.length - util.fixEolChars(inputArea.value).length;
-
-                if (len) {
-                    range.moveStart("character", -fixedRange.length);
-                    while (len--) {
-                        fixedRange += "\n";
-                        stateObj.end += 1;
-                    }
-                    range.text = fixedRange;
-                }
-
-                if (panels.ieCachedRange)
-                    stateObj.scrollTop = panels.ieCachedScrollTop; // this is set alongside with ieCachedRange
-
-                panels.ieCachedRange = null;
-
-                this.setInputAreaSelection();
-            }
-        };
-
-        // Restore this state into the input area.
-        this.restore = function () {
-
-            if (stateObj.text != undefined && stateObj.text != inputArea.value) {
-                inputArea.value = stateObj.text;
-            }
-            this.setInputAreaSelection();
-            inputArea.scrollTop = stateObj.scrollTop;
-        };
-
-        // Gets a collection of HTML chunks from the inptut textarea.
-        this.getChunks = function () {
-
-            var chunk = new Chunks();
-            chunk.before = util.fixEolChars(stateObj.text.substring(0, stateObj.start));
-            chunk.startTag = "";
-            chunk.selection = util.fixEolChars(stateObj.text.substring(stateObj.start, stateObj.end));
-            chunk.endTag = "";
-            chunk.after = util.fixEolChars(stateObj.text.substring(stateObj.end));
-            chunk.scrollTop = stateObj.scrollTop;
-
-            return chunk;
-        };
-
-        // Sets the TextareaState properties given a chunk of markdown.
-        this.setChunks = function (chunk) {
-
-            chunk.before = chunk.before + chunk.startTag;
-            chunk.after = chunk.endTag + chunk.after;
-
-            this.start = chunk.before.length;
-            this.end = chunk.before.length + chunk.selection.length;
-            this.text = chunk.before + chunk.selection + chunk.after;
-            this.scrollTop = chunk.scrollTop;
-        };
-        this.init();
-    };
-
-    function PreviewManager(converter, panels, previewRefreshCallback) {
-
-        var managerObj = this;
-        var timeout;
-        var elapsedTime;
-        var oldInputText;
-        var maxDelay = 3000;
-        var startType = "delayed"; // The other legal value is "manual"
-
-        // Adds event listeners to elements
-        var setupEvents = function (inputElem, listener) {
-
-            util.addEvent(inputElem, "input", listener);
-            inputElem.onpaste = listener;
-            inputElem.ondrop = listener;
-
-            util.addEvent(inputElem, "keypress", listener);
-            util.addEvent(inputElem, "keydown", listener);
-        };
-
-        var getDocScrollTop = function () {
-
-            var result = 0;
-
-            if (window.innerHeight) {
-                result = window.pageYOffset;
-            }
-            else
-                if (doc.documentElement && doc.documentElement.scrollTop) {
-                    result = doc.documentElement.scrollTop;
-                }
-                else
-                    if (doc.body) {
-                        result = doc.body.scrollTop;
-                    }
-
-            return result;
-        };
-
-        var makePreviewHtml = function () {
-
-            // If there is no registered preview panel
-            // there is nothing to do.
-            if (!panels.preview)
-                return;
-
-
-            var text = panels.input.value;
-            if (text && text == oldInputText) {
-                return; // Input text hasn't changed.
-            }
-            else {
-                oldInputText = text;
-            }
-
-            var prevTime = new Date().getTime();
-
-            text = converter.makeHtml(text);
-
-            // Calculate the processing time of the HTML creation.
-            // It's used as the delay time in the event listener.
-            var currTime = new Date().getTime();
-            elapsedTime = currTime - prevTime;
-
-            pushPreviewHtml(text);
-        };
-
-        // setTimeout is already used.  Used as an event listener.
-        var applyTimeout = function () {
-
-            if (timeout) {
-                clearTimeout(timeout);
-                timeout = undefined;
-            }
-
-            if (startType !== "manual") {
-
-                var delay = 0;
-
-                if (startType === "delayed") {
-                    delay = elapsedTime;
-                }
-
-                if (delay > maxDelay) {
-                    delay = maxDelay;
-                }
-                timeout = setTimeout(makePreviewHtml, delay);
-            }
-        };
-
-        var getScaleFactor = function (panel) {
-            if (panel.scrollHeight <= panel.clientHeight) {
-                return 1;
-            }
-            return panel.scrollTop / (panel.scrollHeight - panel.clientHeight);
-        };
-
-        var setPanelScrollTops = function () {
-            if (panels.preview) {
-                panels.preview.scrollTop = (panels.preview.scrollHeight - panels.preview.clientHeight) * getScaleFactor(panels.preview);
-            }
-        };
-
-        this.refresh = function (requiresRefresh) {
-
-            if (requiresRefresh) {
-                oldInputText = "";
-                makePreviewHtml();
-            }
-            else {
-                applyTimeout();
-            }
-        };
-
-        this.processingTime = function () {
-            return elapsedTime;
-        };
-
-        var isFirstTimeFilled = true;
-
-        // IE doesn't let you use innerHTML if the element is contained somewhere in a table
-        // (which is the case for inline editing) -- in that case, detach the element, set the
-        // value, and reattach. Yes, that *is* ridiculous.
-        var ieSafePreviewSet = function (text) {
-            var preview = panels.preview;
-            var parent = preview.parentNode;
-            var sibling = preview.nextSibling;
-            parent.removeChild(preview);
-            preview.innerHTML = text;
-            if (!sibling)
-                parent.appendChild(preview);
-            else
-                parent.insertBefore(preview, sibling);
-        }
-
-        var nonSuckyBrowserPreviewSet = function (text) {
-            panels.preview.innerHTML = text;
-        }
-
-        var previewSetter;
-
-        var previewSet = function (text) {
-            if (previewSetter)
-                return previewSetter(text);
-
-            try {
-                nonSuckyBrowserPreviewSet(text);
-                previewSetter = nonSuckyBrowserPreviewSet;
-            } catch (e) {
-                previewSetter = ieSafePreviewSet;
-                previewSetter(text);
-            }
-        };
-
-        var pushPreviewHtml = function (text) {
-
-            var emptyTop = position.getTop(panels.input) - getDocScrollTop();
-
-            if (panels.preview) {
-                previewSet(text);
-                previewRefreshCallback();
-            }
-
-            setPanelScrollTops();
-
-            if (isFirstTimeFilled) {
-                isFirstTimeFilled = false;
-                return;
-            }
-
-            var fullTop = position.getTop(panels.input) - getDocScrollTop();
-
-            if (uaSniffed.isIE) {
-                setTimeout(function () {
-                    window.scrollBy(0, fullTop - emptyTop);
-                }, 0);
-            }
-            else {
-                window.scrollBy(0, fullTop - emptyTop);
-            }
-        };
-
-        var init = function () {
-
-            setupEvents(panels.input, applyTimeout);
-            makePreviewHtml();
-
-            if (panels.preview) {
-                panels.preview.scrollTop = 0;
-            }
-        };
-
-        init();
-    };
-
-    // Creates the background behind the hyperlink text entry box.
-    // And download dialog
-    // Most of this has been moved to CSS but the div creation and
-    // browser-specific hacks remain here.
-    ui.createBackground = function () {
-
-        var background = doc.createElement("div"),
-            style = background.style;
-
-        background.className = "wmd-prompt-background";
-
-        style.position = "absolute";
-        style.top = "0";
-
-        style.zIndex = "1000";
-
-        if (uaSniffed.isIE) {
-            style.filter = "alpha(opacity=50)";
-        }
-        else {
-            style.opacity = "0.5";
-        }
-
-        var pageSize = position.getPageSize();
-        style.height = pageSize[1] + "px";
-
-        if (uaSniffed.isIE) {
-            style.left = doc.documentElement.scrollLeft;
-            style.width = doc.documentElement.clientWidth;
-        }
-        else {
-            style.left = "0";
-            style.width = "100%";
-        }
-
-        doc.body.appendChild(background);
-        return background;
-    };
-
-    // This simulates a modal dialog box and asks for the URL when you
-    // click the hyperlink or image buttons.
-    //
-    // text: The html for the input box.
-    // defaultInputText: The default value that appears in the input box.
-    // callback: The function which is executed when the prompt is dismissed, either via OK or Cancel.
-    //      It receives a single argument; either the entered text (if OK was chosen) or null (if Cancel
-    //      was chosen).
-    ui.prompt = function (text, defaultInputText, callback, ok, cancel) {
-
-        // These variables need to be declared at this level since they are used
-        // in multiple functions.
-        var dialog;         // The dialog box.
-        var input;         // The text box where you enter the hyperlink.
-
-
-        if (defaultInputText === undefined) {
-            defaultInputText = "";
-        }
-
-        // Used as a keydown event handler. Esc dismisses the prompt.
-        // Key code 27 is ESC.
-        var checkEscape = function (key) {
-            var code = (key.charCode || key.keyCode);
-            if (code === 27) {
-                close(true);
-            }
-        };
-
-        // Dismisses the hyperlink input box.
-        // isCancel is true if we don't care about the input text.
-        // isCancel is false if we are going to keep the text.
-        var close = function (isCancel) {
-            util.removeEvent(doc.body, "keydown", checkEscape);
-            var text = input.value;
-
-            if (isCancel) {
-                text = null;
-            }
-            else {
-                // Fixes common pasting errors.
-                text = text.replace(/^http:\/\/(https?|ftp):\/\//, '$1://');
-                if (!/^(?:https?|ftp):\/\//.test(text))
-                    text = 'http://' + text;
-            }
-
-            dialog.parentNode.removeChild(dialog);
-
-            callback(text);
-            return false;
-        };
-
-
-
-        // Create the text input box form/window.
-        var createDialog = function () {
-
-            // The main dialog box.
-            dialog = doc.createElement("div");
-            dialog.className = "wmd-prompt-dialog";
-            /*
-            dialog.style.padding = "10px;";
-            dialog.style.position = "fixed";
-            dialog.style.width = "400px";
-            dialog.style.zIndex = "1001";
-            */
-
-            // The dialog text.
-            var question = doc.createElement("div");
-            question.innerHTML = text;
-            // question.style.padding = "5px";
-            dialog.appendChild(question);
-
-            // The web form container for the text box and buttons.
-            var form = doc.createElement("form"),
-                style = form.style;
-            form.onsubmit = function () { return close(false); };
-            /*
-            style.padding = "0";
-            style.margin = "0";
-            style.cssFloat = "left";
-            style.width = "100%";
-            style.textAlign = "center";
-            style.position = "relative";
-            */
-            dialog.appendChild(form);
-
-            // The input text box
-            input = doc.createElement("input");
-            input.type = "text";
-            input.value = defaultInputText;
-            /*
-            style = input.style;
-            style.display = "block";
-            style.width = "80%";
-            style.marginLeft = style.marginRight = "auto";
-            */
-            form.appendChild(input);
-
-            // The ok button
-            var okButton = doc.createElement("button");
-            okButton.type = "button";
-            okButton.className = "btn-s primary";
-            okButton.onclick = function () { return close(false); };
-            okButton.innerHTML = ok;
-            /*
-            style = okButton.style;
-            style.margin = "10px";
-            style.display = "inline";
-            style.width = "7em";
-            */
-
-            // The cancel button
-            var cancelButton = doc.createElement("button");
-            cancelButton.type = "button";
-            cancelButton.className = "btn-s";
-            cancelButton.onclick = function () { return close(true); };
-            cancelButton.innerHTML = cancel;
-            /*
-            style = cancelButton.style;
-            style.margin = "10px";
-            style.display = "inline";
-            style.width = "7em";
-            */
-
-            form.appendChild(okButton);
-            form.appendChild(cancelButton);
-
-            util.addEvent(doc.body, "keydown", checkEscape);
-            /*
-            dialog.style.top = "50%";
-            dialog.style.left = "50%";
-            dialog.style.display = "block";
-            if (uaSniffed.isIE_5or6) {
-                dialog.style.position = "absolute";
-                dialog.style.top = doc.documentElement.scrollTop + 200 + "px";
-                dialog.style.left = "50%";
-            }
-            */
-            doc.body.appendChild(dialog);
-
-            // This has to be done AFTER adding the dialog to the form if you
-            // want it to be centered.
-            /*
-            dialog.style.marginTop = -(position.getHeight(dialog) / 2) + "px";
-            dialog.style.marginLeft = -(position.getWidth(dialog) / 2) + "px";
-            */
-
-        };
-
-        // Why is this in a zero-length timeout?
-        // Is it working around a browser bug?
-        setTimeout(function () {
-
-            createDialog();
-
-            var defTextLen = defaultInputText.length;
-            if (input.selectionStart !== undefined) {
-                input.selectionStart = 0;
-                input.selectionEnd = defTextLen;
-            }
-            else if (input.createTextRange) {
-                var range = input.createTextRange();
-                range.collapse(false);
-                range.moveStart("character", -defTextLen);
-                range.moveEnd("character", defTextLen);
-                range.select();
-            }
-
-            input.focus();
-        }, 0);
-    };
-
-    function UIManager(postfix, panels, undoManager, previewManager, commandManager, fullScreenManager, helpOptions, getString) {
-
-        var inputBox = panels.input,
-            buttons = {}; // buttons.undo, buttons.link, etc. The actual DOM elements.
-
-        makeSpritedButtonRow();
-
-        var keyEvent = "keydown";
-        if (uaSniffed.isOpera) {
-            keyEvent = "keypress";
-        }
-
-        util.addEvent(inputBox, keyEvent, function (key) {
-            // Check to see if we have a button key and, if so execute the callback.
-            if ((key.ctrlKey || key.metaKey) && !key.altKey && !key.shiftKey) {
-
-                var keyCode = key.charCode || key.keyCode;
-                var keyCodeStr = String.fromCharCode(keyCode).toLowerCase();
-
-                switch (keyCodeStr) {
-                    case "b":
-                        doClick(buttons.bold);
-                        break;
-                    case "i":
-                        doClick(buttons.italic);
-                        break;
-                    case "l":
-                        doClick(buttons.link);
-                        break;
-                    case "q":
-                        doClick(buttons.quote);
-                        break;
-                    case "k":
-                        doClick(buttons.code);
-                        break;
-                    case "g":
-                        doClick(buttons.image);
-                        break;
-                    case "o":
-                        doClick(buttons.olist);
-                        break;
-                    case "u":
-                        doClick(buttons.ulist);
-                        break;
-                    case 'm':
-                        doClick(buttons.more);
-                        break;
-                    case 'j':
-                        doClick(buttons.fullscreen);
-                        break;
-                    case 'e':
-                        doClick(buttons.exitFullscreen);
-                        break;
-                    case "h":
-                        doClick(buttons.heading);
-                        break;
-                    case "r":
-                        doClick(buttons.hr);
-                        break;
-                    case "y":
-                        doClick(buttons.redo);
-                        break;
-                    case "z":
-                        if (key.shiftKey) {
-                            doClick(buttons.redo);
-                        }
-                        else {
-                            doClick(buttons.undo);
-                        }
-                        break;
-                    default:
-                        return;
-                }
-
-
-                if (key.preventDefault) {
-                    key.preventDefault();
-                }
-
-                if (window.event) {
-                    window.event.returnValue = false;
-                }
-            }else if(key.keyCode==9){
-                var tab = {};
-                tab.textOp = bindCommand("doTab");
-                doClick(tab);
-
-                if (key.preventDefault) {
-                    key.preventDefault();
-                }
-                if (window.event) {
-                    window.event.returnValue = false;
-                }
-            }
-        });
-
-        // Auto-indent on shift-enter
-        util.addEvent(inputBox, "keyup", function (key) {
-            if (key.shiftKey && !key.ctrlKey && !key.metaKey) {
-                var keyCode = key.charCode || key.keyCode;
-                // Character 13 is Enter
-                if (keyCode === 13) {
-                    var fakeButton = {};
-                    fakeButton.textOp = bindCommand("doAutoindent");
-                    doClick(fakeButton);
-                }
-            }
-        });
-
-        // special handler because IE clears the context of the textbox on ESC
-        if (uaSniffed.isIE) {
-            util.addEvent(inputBox, "keydown", function (key) {
-                var code = key.keyCode;
-                if (code === 27) {
-                    return false;
-                }
-            });
-        }
-
-
-        // Perform the button's action.
-        function doClick(button) {
-
-            inputBox.focus();
-
-            if (button.textOp) {
-
-                if (undoManager) {
-                    undoManager.setCommandMode();
-                }
-
-                var state = new TextareaState(panels);
-
-                if (!state) {
-                    return;
-                }
-
-                var chunks = state.getChunks();
-
-                // Some commands launch a "modal" prompt dialog.  Javascript
-                // can't really make a modal dialog box and the WMD code
-                // will continue to execute while the dialog is displayed.
-                // This prevents the dialog pattern I'm used to and means
-                // I can't do something like this:
-                //
-                // var link = CreateLinkDialog();
-                // makeMarkdownLink(link);
-                //
-                // Instead of this straightforward method of handling a
-                // dialog I have to pass any code which would execute
-                // after the dialog is dismissed (e.g. link creation)
-                // in a function parameter.
-                //
-                // Yes this is awkward and I think it sucks, but there's
-                // no real workaround.  Only the image and link code
-                // create dialogs and require the function pointers.
-                var fixupInputArea = function () {
-
-                    inputBox.focus();
-
-                    if (chunks) {
-                        state.setChunks(chunks);
-                    }
-
-                    state.restore();
-                    previewManager.refresh();
-                };
-
-                var noCleanup = button.textOp(chunks, fixupInputArea);
-
-                if (!noCleanup) {
-                    fixupInputArea();
-                }
-
-            }
-
-            if (button.execute) {
-                button.execute(undoManager);
-            }
-        };
-
-        function setupButton(button, isEnabled) {
-
-            var normalYShift = "0px";
-            var disabledYShift = "-20px";
-            var highlightYShift = "-40px";
-            var image = button.getElementsByTagName("span")[0];
-            if (isEnabled) {
-                image.style.backgroundPosition = button.XShift + " " + normalYShift;
-                button.onmouseover = function () {
-                    image.style.backgroundPosition = this.XShift + " " + highlightYShift;
-                };
-
-                button.onmouseout = function () {
-                    image.style.backgroundPosition = this.XShift + " " + normalYShift;
-                };
-
-                // IE tries to select the background image "button" text (it's
-                // implemented in a list item) so we have to cache the selection
-                // on mousedown.
-                if (uaSniffed.isIE) {
-                    button.onmousedown = function () {
-                        if (doc.activeElement && doc.activeElement !== panels.input) { // we're not even in the input box, so there's no selection
-                            return;
-                        }
-                        panels.ieCachedRange = document.selection.createRange();
-                        panels.ieCachedScrollTop = panels.input.scrollTop;
-                    };
-                }
-
-                if (!button.isHelp) {
-                    button.onclick = function () {
-                        if (this.onmouseout) {
-                            this.onmouseout();
-                        }
-                        doClick(this);
-                        return false;
-                    }
-                }
-            }
-            else {
-                image.style.backgroundPosition = button.XShift + " " + disabledYShift;
-                button.onmouseover = button.onmouseout = button.onclick = function () { };
-            }
-        }
-
-        function bindCommand(method) {
-            if (typeof method === "string")
-                method = commandManager[method];
-            return function () { method.apply(commandManager, arguments); }
-        }
-
-        function makeSpritedButtonRow() {
-
-            var buttonBar = panels.buttonBar;
-
-            var normalYShift = "0px";
-            var disabledYShift = "-20px";
-            var highlightYShift = "-40px";
-
-            var buttonRow = document.createElement("ul");
-            buttonRow.id = "wmd-button-row" + postfix;
-            buttonRow.className = 'wmd-button-row';
-            buttonRow = buttonBar.appendChild(buttonRow);
-            var xPosition = 0;
-            var makeButton = function (id, title, XShift, textOp) {
-                var button = document.createElement("li");
-                button.className = "wmd-button";
-                button.style.left = xPosition + "px";
-                xPosition += 25;
-                var buttonImage = document.createElement("span");
-                button.id = id + postfix;
-                button.appendChild(buttonImage);
-                button.title = title;
-                button.XShift = XShift;
-                if (textOp)
-                    button.textOp = textOp;
-                setupButton(button, true);
-                buttonRow.appendChild(button);
-                return button;
-            };
-            var makeSpacer = function (num) {
-                var spacer = document.createElement("li");
-                spacer.className = "wmd-spacer wmd-spacer" + num;
-                spacer.id = "wmd-spacer" + num + postfix;
-                buttonRow.appendChild(spacer);
-                xPosition += 25;
-            }
-
-            buttons.bold = makeButton("wmd-bold-button", getString("bold"), "0px", bindCommand("doBold"));
-            buttons.italic = makeButton("wmd-italic-button", getString("italic"), "-20px", bindCommand("doItalic"));
-            makeSpacer(1);
-            buttons.link = makeButton("wmd-link-button", getString("link"), "-40px", bindCommand(function (chunk, postProcessing) {
-                return this.doLinkOrImage(chunk, postProcessing, false);
-            }));
-            buttons.quote = makeButton("wmd-quote-button", getString("quote"), "-60px", bindCommand("doBlockquote"));
-            buttons.code = makeButton("wmd-code-button", getString("code"), "-80px", bindCommand("doCode"));
-            buttons.image = makeButton("wmd-image-button", getString("image"), "-100px", bindCommand(function (chunk, postProcessing) {
-                return this.doLinkOrImage(chunk, postProcessing, true);
-            }));
-            makeSpacer(2);
-            buttons.olist = makeButton("wmd-olist-button", getString("olist"), "-120px", bindCommand(function (chunk, postProcessing) {
-                this.doList(chunk, postProcessing, true);
-            }));
-            buttons.ulist = makeButton("wmd-ulist-button", getString("ulist"), "-140px", bindCommand(function (chunk, postProcessing) {
-                this.doList(chunk, postProcessing, false);
-            }));
-            buttons.heading = makeButton("wmd-heading-button", getString("heading"), "-160px", bindCommand("doHeading"));
-            buttons.hr = makeButton("wmd-hr-button", getString("hr"), "-180px", bindCommand("doHorizontalRule"));
-            buttons.more = makeButton("wmd-more-button", getString("more"), "-280px", bindCommand("doMore"));
-            makeSpacer(3);
-            buttons.undo = makeButton("wmd-undo-button", getString("undo"), "-200px", null);
-            buttons.undo.execute = function (manager) { if (manager) manager.undo(); };
-
-            var redoTitle = /win/.test(nav.platform.toLowerCase()) ?
-                getString("redo") :
-                getString("redomac"); // mac and other non-Windows platforms
-
-            buttons.redo = makeButton("wmd-redo-button", redoTitle, "-220px", null);
-            buttons.redo.execute = function (manager) { if (manager) manager.redo(); };
-            buttons.fullscreen = makeButton("wmd-fullscreen-button", getString("fullscreen"), "-240px", null);
-            buttons.fullscreen.execute = function () { fullScreenManager.doFullScreen(buttons, true); };
-            buttons.exitFullscreen = makeButton("wmd-exit-fullscreen-button", getString("exitFullscreen"), "-260px", null);
-            buttons.exitFullscreen.style.display = 'none';
-            buttons.exitFullscreen.execute = function () { fullScreenManager.doFullScreen(buttons, false); };
-
-            if (helpOptions) {
-                var helpButton = document.createElement("li");
-                var helpButtonImage = document.createElement("span");
-                helpButton.appendChild(helpButtonImage);
-                helpButton.className = "wmd-button wmd-help-button";
-                helpButton.id = "wmd-help-button" + postfix;
-                helpButton.XShift = "-300px";
-                helpButton.isHelp = true;
-                helpButton.style.right = "0px";
-                helpButton.title = getString("help");
-                helpButton.onclick = helpOptions.handler;
-
-                setupButton(helpButton, true);
-                buttonRow.appendChild(helpButton);
-                buttons.help = helpButton;
-            }
-
-            setUndoRedoButtonStates();
-        }
-
-        function setUndoRedoButtonStates() {
-            if (undoManager) {
-                setupButton(buttons.undo, undoManager.canUndo());
-                setupButton(buttons.redo, undoManager.canRedo());
-            }
-        };
-
-        this.setUndoRedoButtonStates = setUndoRedoButtonStates;
-
-    }
-
-    function CommandManager(pluginHooks, getString) {
-        this.hooks = pluginHooks;
-        this.getString = getString;
-    }
-
-    var commandProto = CommandManager.prototype;
-
-    // The markdown symbols - 4 spaces = code, > = blockquote, etc.
-    commandProto.prefixes = "(?:\\s{4,}|\\s*>|\\s*-\\s+|\\s*\\d+\\.|=|\\+|-|_|\\*|#|\\s*\\[[^\n]]+\\]:)";
-
-    // Remove markdown symbols from the chunk selection.
-    commandProto.unwrap = function (chunk) {
-        var txt = new re("([^\\n])\\n(?!(\\n|" + this.prefixes + "))", "g");
-        chunk.selection = chunk.selection.replace(txt, "$1 $2");
-    };
-
-    commandProto.wrap = function (chunk, len) {
-        this.unwrap(chunk);
-        var regex = new re("(.{1," + len + "})( +|$\\n?)", "gm"),
-            that = this;
-
-        chunk.selection = chunk.selection.replace(regex, function (line, marked) {
-            if (new re("^" + that.prefixes, "").test(line)) {
-                return line;
-            }
-            return marked + "\n";
-        });
-
-        chunk.selection = chunk.selection.replace(/\s+$/, "");
-    };
-
-    commandProto.doBold = function (chunk, postProcessing) {
-        return this.doBorI(chunk, postProcessing, 2, this.getString("boldexample"));
-    };
-
-    commandProto.doItalic = function (chunk, postProcessing) {
-        return this.doBorI(chunk, postProcessing, 1, this.getString("italicexample"));
-    };
-
-    // chunk: The selected region that will be enclosed with */**
-    // nStars: 1 for italics, 2 for bold
-    // insertText: If you just click the button without highlighting text, this gets inserted
-    commandProto.doBorI = function (chunk, postProcessing, nStars, insertText) {
-
-        // Get rid of whitespace and fixup newlines.
-        chunk.trimWhitespace();
-        chunk.selection = chunk.selection.replace(/\n{2,}/g, "\n");
-
-        // Look for stars before and after.  Is the chunk already marked up?
-        // note that these regex matches cannot fail
-        var starsBefore = /(\**$)/.exec(chunk.before)[0];
-        var starsAfter = /(^\**)/.exec(chunk.after)[0];
-
-        var prevStars = Math.min(starsBefore.length, starsAfter.length);
-
-        // Remove stars if we have to since the button acts as a toggle.
-        if ((prevStars >= nStars) && (prevStars != 2 || nStars != 1)) {
-            chunk.before = chunk.before.replace(re("[*]{" + nStars + "}$", ""), "");
-            chunk.after = chunk.after.replace(re("^[*]{" + nStars + "}", ""), "");
-        }
-        else if (!chunk.selection && starsAfter) {
-            // It's not really clear why this code is necessary.  It just moves
-            // some arbitrary stuff around.
-            chunk.after = chunk.after.replace(/^([*_]*)/, "");
-            chunk.before = chunk.before.replace(/(\s?)$/, "");
-            var whitespace = re.$1;
-            chunk.before = chunk.before + starsAfter + whitespace;
-        }
-        else {
-
-            // In most cases, if you don't have any selected text and click the button
-            // you'll get a selected, marked up region with the default text inserted.
-            if (!chunk.selection && !starsAfter) {
-                chunk.selection = insertText;
-            }
-
-            // Add the true markup.
-            var markup = nStars <= 1 ? "*" : "**"; // shouldn't the test be = ?
-            chunk.before = chunk.before + markup;
-            chunk.after = markup + chunk.after;
-        }
-
-        return;
-    };
-
-    commandProto.stripLinkDefs = function (text, defsToAdd) {
-
-        text = text.replace(/^[ ]{0,3}\[(\d+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+|$)/gm,
-            function (totalMatch, id, link, newlines, title) {
-                defsToAdd[id] = totalMatch.replace(/\s*$/, "");
-                if (newlines) {
-                    // Strip the title and return that separately.
-                    defsToAdd[id] = totalMatch.replace(/["(](.+?)[")]$/, "");
-                    return newlines + title;
-                }
-                return "";
-            });
-
-        return text;
-    };
-
-    commandProto.addLinkDef = function (chunk, linkDef) {
-
-        var refNumber = 0; // The current reference number
-        var defsToAdd = {}; //
-        // Start with a clean slate by removing all previous link definitions.
-        chunk.before = this.stripLinkDefs(chunk.before, defsToAdd);
-        chunk.selection = this.stripLinkDefs(chunk.selection, defsToAdd);
-        chunk.after = this.stripLinkDefs(chunk.after, defsToAdd);
-
-        var defs = "";
-        var regex = /(\[)((?:\[[^\]]*\]|[^\[\]])*)(\][ ]?(?:\n[ ]*)?\[)(\d+)(\])/g;
-
-        var addDefNumber = function (def) {
-            refNumber++;
-            def = def.replace(/^[ ]{0,3}\[(\d+)\]:/, "  [" + refNumber + "]:");
-            defs += "\n" + def;
-        };
-
-        // note that
-        // a) the recursive call to getLink cannot go infinite, because by definition
-        //    of regex, inner is always a proper substring of wholeMatch, and
-        // b) more than one level of nesting is neither supported by the regex
-        //    nor making a lot of sense (the only use case for nesting is a linked image)
-        var getLink = function (wholeMatch, before, inner, afterInner, id, end) {
-            inner = inner.replace(regex, getLink);
-            if (defsToAdd[id]) {
-                addDefNumber(defsToAdd[id]);
-                return before + inner + afterInner + refNumber + end;
-            }
-            return wholeMatch;
-        };
-
-        chunk.before = chunk.before.replace(regex, getLink);
-
-        if (linkDef) {
-            addDefNumber(linkDef);
-        }
-        else {
-            chunk.selection = chunk.selection.replace(regex, getLink);
-        }
-
-        var refOut = refNumber;
-
-        chunk.after = chunk.after.replace(regex, getLink);
-
-        if (chunk.after) {
-            chunk.after = chunk.after.replace(/\n*$/, "");
-        }
-        if (!chunk.after) {
-            chunk.selection = chunk.selection.replace(/\n*$/, "");
-        }
-
-        chunk.after += "\n\n" + defs;
-
-        return refOut;
-    };
-
-    // takes the line as entered into the add link/as image dialog and makes
-    // sure the URL and the optinal title are "nice".
-    function properlyEncoded(linkdef) {
-        return linkdef.replace(/^\s*(.*?)(?:\s+"(.+)")?\s*$/, function (wholematch, link, title) {
-            link = link.replace(/\?.*$/, function (querypart) {
-                return querypart.replace(/\+/g, " "); // in the query string, a plus and a space are identical
-            });
-            link = decodeURIComponent(link); // unencode first, to prevent double encoding
-            link = encodeURI(link).replace(/'/g, '%27').replace(/\(/g, '%28').replace(/\)/g, '%29');
-            link = link.replace(/\?.*$/, function (querypart) {
-                return querypart.replace(/\+/g, "%2b"); // since we replaced plus with spaces in the query part, all pluses that now appear where originally encoded
-            });
-            if (title) {
-                title = title.trim ? title.trim() : title.replace(/^\s*/, "").replace(/\s*$/, "");
-                title = title.replace(/"/g, "quot;").replace(/\(/g, "&#40;").replace(/\)/g, "&#41;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
-            }
-            return title ? link + ' "' + title + '"' : link;
-        });
-    }
-
-    commandProto.doLinkOrImage = function (chunk, postProcessing, isImage) {
-
-        chunk.trimWhitespace();
-        chunk.findTags(/\s*!?\[/, /\][ ]?(?:\n[ ]*)?(\[.*?\])?/);
-        var background;
-
-        if (chunk.endTag.length > 1 && chunk.startTag.length > 0) {
-
-            chunk.startTag = chunk.startTag.replace(/!?\[/, "");
-            chunk.endTag = "";
-            this.addLinkDef(chunk, null);
-
-        }
-        else {
-
-            // We're moving start and end tag back into the selection, since (as we're in the else block) we're not
-            // *removing* a link, but *adding* one, so whatever findTags() found is now back to being part of the
-            // link text. linkEnteredCallback takes care of escaping any brackets.
-            chunk.selection = chunk.startTag + chunk.selection + chunk.endTag;
-            chunk.startTag = chunk.endTag = "";
-
-            if (/\n\n/.test(chunk.selection)) {
-                this.addLinkDef(chunk, null);
-                return;
-            }
-            var that = this;
-            // The function to be executed when you enter a link and press OK or Cancel.
-            // Marks up the link and adds the ref.
-            var linkEnteredCallback = function (link) {
-
-                background.parentNode.removeChild(background);
-
-                if (link !== null) {
-                    // (                          $1
-                    //     [^\\]                  anything that's not a backslash
-                    //     (?:\\\\)*              an even number (this includes zero) of backslashes
-                    // )
-                    // (?=                        followed by
-                    //     [[\]]                  an opening or closing bracket
-                    // )
-                    //
-                    // In other words, a non-escaped bracket. These have to be escaped now to make sure they
-                    // don't count as the end of the link or similar.
-                    // Note that the actual bracket has to be a lookahead, because (in case of to subsequent brackets),
-                    // the bracket in one match may be the "not a backslash" character in the next match, so it
-                    // should not be consumed by the first match.
-                    // The "prepend a space and finally remove it" steps makes sure there is a "not a backslash" at the
-                    // start of the string, so this also works if the selection begins with a bracket. We cannot solve
-                    // this by anchoring with ^, because in the case that the selection starts with two brackets, this
-                    // would mean a zero-width match at the start. Since zero-width matches advance the string position,
-                    // the first bracket could then not act as the "not a backslash" for the second.
-                    chunk.selection = (" " + chunk.selection).replace(/([^\\](?:\\\\)*)(?=[[\]])/g, "$1\\").substr(1);
-
-                    var linkDef = " [999]: " + properlyEncoded(link);
-
-                    var num = that.addLinkDef(chunk, linkDef);
-                    chunk.startTag = isImage ? "![" : "[";
-                    chunk.endTag = "][" + num + "]";
-
-                    if (!chunk.selection) {
-                        if (isImage) {
-                            var imagename = that.getString("imagename");
-                            if (!!imagename) {
-                                imagename = imagename.replace(/_/g, '\\_');
-                            }
-
-                            chunk.selection = imagename || that.getString("imagedescription");
-                        }
-                        else {
-                            var linkname = that.getString("linkname");
-                            if (!!linkname) {
-                                linkname = linkname.replace(/_/g, '\\_');
-                            }
-
-                            chunk.selection = linkname || that.getString("linkdescription");
-                        }
-                    }
-                }
-                postProcessing();
-            };
-
-            background = ui.createBackground();
-
-            if (isImage) {
-                if (!this.hooks.insertImageDialog(linkEnteredCallback))
-                    ui.prompt(this.getString("imagedialog"), imageDefaultText, linkEnteredCallback, this.getString("ok"), this.getString("cancel"));
-            }
-            else {
-                if (!this.hooks.insertLinkDialog(linkEnteredCallback))
-                    ui.prompt(this.getString("linkdialog"), linkDefaultText, linkEnteredCallback, this.getString("ok"), this.getString("cancel"));
-            }
-            return true;
-        }
-    };
-
-    // When making a list, hitting shift-enter will put your cursor on the next line
-    // at the current indent level.
-    commandProto.doAutoindent = function (chunk, postProcessing) {
-
-        var commandMgr = this,
-            fakeSelection = false;
-
-        chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}([*+-]|\d+[.])[ \t]*\n$/, "\n\n");
-        chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}>[ \t]*\n$/, "\n\n");
-        chunk.before = chunk.before.replace(/(\n|^)[ \t]+\n$/, "\n\n");
-
-        // There's no selection, end the cursor wasn't at the end of the line:
-        // The user wants to split the current list item / code line / blockquote line
-        // (for the latter it doesn't really matter) in two. Temporarily select the
-        // (rest of the) line to achieve this.
-        if (!chunk.selection && !/^[ \t]*(?:\n|$)/.test(chunk.after)) {
-            chunk.after = chunk.after.replace(/^[^\n]*/, function (wholeMatch) {
-                chunk.selection = wholeMatch;
-                return "";
-            });
-            fakeSelection = true;
-        }
-
-        if (/(\n|^)[ ]{0,3}([*+-]|\d+[.])[ \t]+.*\n$/.test(chunk.before)) {
-            if (commandMgr.doList) {
-                commandMgr.doList(chunk);
-            }
-        }
-        if (/(\n|^)[ ]{0,3}>[ \t]+.*\n$/.test(chunk.before)) {
-            if (commandMgr.doBlockquote) {
-                commandMgr.doBlockquote(chunk);
-            }
-        }
-        if (/(\n|^)(\t|[ ]{4,}).*\n$/.test(chunk.before)) {
-            if (commandMgr.doCode) {
-                commandMgr.doCode(chunk);
-            }
-        }
-
-        if (fakeSelection) {
-            chunk.after = chunk.selection + chunk.after;
-            chunk.selection = "";
-        }
-    };
-
-    commandProto.doBlockquote = function (chunk, postProcessing) {
-
-        chunk.selection = chunk.selection.replace(/^(\n*)([^\r]+?)(\n*)$/,
-            function (totalMatch, newlinesBefore, text, newlinesAfter) {
-                chunk.before += newlinesBefore;
-                chunk.after = newlinesAfter + chunk.after;
-                return text;
-            });
-
-        chunk.before = chunk.before.replace(/(>[ \t]*)$/,
-            function (totalMatch, blankLine) {
-                chunk.selection = blankLine + chunk.selection;
-                return "";
-            });
-
-        chunk.selection = chunk.selection.replace(/^(\s|>)+$/, "");
-        chunk.selection = chunk.selection || this.getString("quoteexample");
-
-        // The original code uses a regular expression to find out how much of the
-        // text *directly before* the selection already was a blockquote:
-
-        /*
-        if (chunk.before) {
-        chunk.before = chunk.before.replace(/\n?$/, "\n");
-        }
-        chunk.before = chunk.before.replace(/(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*$)/,
-        function (totalMatch) {
-        chunk.startTag = totalMatch;
-        return "";
-        });
-        */
-
-        // This comes down to:
-        // Go backwards as many lines a possible, such that each line
-        //  a) starts with ">", or
-        //  b) is almost empty, except for whitespace, or
-        //  c) is preceeded by an unbroken chain of non-empty lines
-        //     leading up to a line that starts with ">" and at least one more character
-        // and in addition
-        //  d) at least one line fulfills a)
-        //
-        // Since this is essentially a backwards-moving regex, it's susceptible to
-        // catstrophic backtracking and can cause the browser to hang;
-        // see e.g. http://meta.stackoverflow.com/questions/9807.
-        //
-        // Hence we replaced this by a simple state machine that just goes through the
-        // lines and checks for a), b), and c).
-
-        var match = "",
-            leftOver = "",
-            line;
-        if (chunk.before) {
-            var lines = chunk.before.replace(/\n$/, "").split("\n");
-            var inChain = false;
-            for (var i = 0; i < lines.length; i++) {
-                var good = false;
-                line = lines[i];
-                inChain = inChain && line.length > 0; // c) any non-empty line continues the chain
-                if (/^>/.test(line)) {                // a)
-                    good = true;
-                    if (!inChain && line.length > 1)  // c) any line that starts with ">" and has at least one more character starts the chain
-                        inChain = true;
-                } else if (/^[ \t]*$/.test(line)) {   // b)
-                    good = true;
-                } else {
-                    good = inChain;                   // c) the line is not empty and does not start with ">", so it matches if and only if we're in the chain
-                }
-                if (good) {
-                    match += line + "\n";
-                } else {
-                    leftOver += match + line;
-                    match = "\n";
-                }
-            }
-            if (!/(^|\n)>/.test(match)) {             // d)
-                leftOver += match;
-                match = "";
-            }
-        }
-
-        chunk.startTag = match;
-        chunk.before = leftOver;
-
-        // end of change
-
-        if (chunk.after) {
-            chunk.after = chunk.after.replace(/^\n?/, "\n");
-        }
-
-        chunk.after = chunk.after.replace(/^(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*)/,
-            function (totalMatch) {
-                chunk.endTag = totalMatch;
-                return "";
-            }
-        );
-
-        var replaceBlanksInTags = function (useBracket) {
-
-            var replacement = useBracket ? "> " : "";
-
-            if (chunk.startTag) {
-                chunk.startTag = chunk.startTag.replace(/\n((>|\s)*)\n$/,
-                    function (totalMatch, markdown) {
-                        return "\n" + markdown.replace(/^[ ]{0,3}>?[ \t]*$/gm, replacement) + "\n";
-                    });
-            }
-            if (chunk.endTag) {
-                chunk.endTag = chunk.endTag.replace(/^\n((>|\s)*)\n/,
-                    function (totalMatch, markdown) {
-                        return "\n" + markdown.replace(/^[ ]{0,3}>?[ \t]*$/gm, replacement) + "\n";
-                    });
-            }
-        };
-
-        if (/^(?![ ]{0,3}>)/m.test(chunk.selection)) {
-            this.wrap(chunk, SETTINGS.lineLength - 2);
-            chunk.selection = chunk.selection.replace(/^/gm, "> ");
-            replaceBlanksInTags(true);
-            chunk.skipLines();
-        } else {
-            chunk.selection = chunk.selection.replace(/^[ ]{0,3}> ?/gm, "");
-            this.unwrap(chunk);
-            replaceBlanksInTags(false);
-
-            if (!/^(\n|^)[ ]{0,3}>/.test(chunk.selection) && chunk.startTag) {
-                chunk.startTag = chunk.startTag.replace(/\n{0,2}$/, "\n\n");
-            }
-
-            if (!/(\n|^)[ ]{0,3}>.*$/.test(chunk.selection) && chunk.endTag) {
-                chunk.endTag = chunk.endTag.replace(/^\n{0,2}/, "\n\n");
-            }
-        }
-
-        chunk.selection = this.hooks.postBlockquoteCreation(chunk.selection);
-
-        if (!/\n/.test(chunk.selection)) {
-            chunk.selection = chunk.selection.replace(/^(> *)/,
-            function (wholeMatch, blanks) {
-                chunk.startTag += blanks;
-                return "";
-            });
-        }
-    };
-
-    commandProto.doCode = function (chunk, postProcessing) {
-
-        var hasTextBefore = /\S[ ]*$/.test(chunk.before);
-        var hasTextAfter = /^[ ]*\S/.test(chunk.after);
-
-        // Use 'four space' markdown if the selection is on its own
-        // line or is multiline.
-        if ((!hasTextAfter && !hasTextBefore) || /\n/.test(chunk.selection)) {
-
-            chunk.before = chunk.before.replace(/[ ]{4}$/,
-                function (totalMatch) {
-                    chunk.selection = totalMatch + chunk.selection;
-                    return "";
-                });
-
-            var nLinesBack = 1;
-            var nLinesForward = 1;
-
-            if (/(\n|^)(\t|[ ]{4,}).*\n$/.test(chunk.before)) {
-                nLinesBack = 0;
-            }
-            if (/^\n(\t|[ ]{4,})/.test(chunk.after)) {
-                nLinesForward = 0;
-            }
-
-            chunk.skipLines(nLinesBack, nLinesForward);
-
-            if (!chunk.selection) {
-                chunk.startTag = "    ";
-                chunk.selection = this.getString("codeexample");
-            }
-            else {
-                if (/^[ ]{0,3}\S/m.test(chunk.selection)) {
-                    if (/\n/.test(chunk.selection))
-                        chunk.selection = chunk.selection.replace(/^/gm, "    ");
-                    else // if it's not multiline, do not select the four added spaces; this is more consistent with the doList behavior
-                        chunk.before += "    ";
-                }
-                else {
-                    chunk.selection = chunk.selection.replace(/^(?:[ ]{4}|[ ]{0,3}\t)/gm, "");
-                }
-            }
-        }
-        else {
-            // Use backticks (`) to delimit the code block.
-
-            chunk.trimWhitespace();
-            chunk.findTags(/`/, /`/);
-
-            if (!chunk.startTag && !chunk.endTag) {
-                chunk.startTag = chunk.endTag = "`";
-                if (!chunk.selection) {
-                    chunk.selection = this.getString("codeexample");
-                }
-            }
-            else if (chunk.endTag && !chunk.startTag) {
-                chunk.before += chunk.endTag;
-                chunk.endTag = "";
-            }
-            else {
-                chunk.startTag = chunk.endTag = "";
-            }
-        }
-    };
-
-    commandProto.doList = function (chunk, postProcessing, isNumberedList) {
-
-        // These are identical except at the very beginning and end.
-        // Should probably use the regex extension function to make this clearer.
-        var previousItemsRegex = /(\n|^)(([ ]{0,3}([*+-]|\d+[.])[ \t]+.*)(\n.+|\n{2,}([*+-].*|\d+[.])[ \t]+.*|\n{2,}[ \t]+\S.*)*)\n*$/;
-        var nextItemsRegex = /^\n*(([ ]{0,3}([*+-]|\d+[.])[ \t]+.*)(\n.+|\n{2,}([*+-].*|\d+[.])[ \t]+.*|\n{2,}[ \t]+\S.*)*)\n*/;
-
-        // The default bullet is a dash but others are possible.
-        // This has nothing to do with the particular HTML bullet,
-        // it's just a markdown bullet.
-        var bullet = "-";
-
-        // The number in a numbered list.
-        var num = 1;
-
-        // Get the item prefix - e.g. " 1. " for a numbered list, " - " for a bulleted list.
-        var getItemPrefix = function () {
-            var prefix;
-            if (isNumberedList) {
-                prefix = " " + num + ". ";
-                num++;
-            }
-            else {
-                prefix = " " + bullet + " ";
-            }
-            return prefix;
-        };
-
-        // Fixes the prefixes of the other list items.
-        var getPrefixedItem = function (itemText) {
-
-            // The numbering flag is unset when called by autoindent.
-            if (isNumberedList === undefined) {
-                isNumberedList = /^\s*\d/.test(itemText);
-            }
-
-            // Renumber/bullet the list element.
-            itemText = itemText.replace(/^[ ]{0,3}([*+-]|\d+[.])\s/gm,
-                function (_) {
-                    return getItemPrefix();
-                });
-
-            return itemText;
-        };
-
-        chunk.findTags(/(\n|^)*[ ]{0,3}([*+-]|\d+[.])\s+/, null);
-
-        if (chunk.before && !/\n$/.test(chunk.before) && !/^\n/.test(chunk.startTag)) {
-            chunk.before += chunk.startTag;
-            chunk.startTag = "";
-        }
-
-        if (chunk.startTag) {
-
-            var hasDigits = /\d+[.]/.test(chunk.startTag);
-            chunk.startTag = "";
-            chunk.selection = chunk.selection.replace(/\n[ ]{4}/g, "\n");
-            this.unwrap(chunk);
-            chunk.skipLines();
-
-            if (hasDigits) {
-                // Have to renumber the bullet points if this is a numbered list.
-                chunk.after = chunk.after.replace(nextItemsRegex, getPrefixedItem);
-            }
-            if (isNumberedList == hasDigits) {
-                return;
-            }
-        }
-
-        var nLinesUp = 1;
-
-        chunk.before = chunk.before.replace(previousItemsRegex,
-            function (itemText) {
-                if (/^\s*([*+-])/.test(itemText)) {
-                    bullet = re.$1;
-                }
-                nLinesUp = /[^\n]\n\n[^\n]/.test(itemText) ? 1 : 0;
-                return getPrefixedItem(itemText);
-            });
-
-        if (!chunk.selection) {
-            chunk.selection = this.getString("litem");
-        }
-
-        var prefix = getItemPrefix();
-
-        var nLinesDown = 1;
-
-        chunk.after = chunk.after.replace(nextItemsRegex,
-            function (itemText) {
-                nLinesDown = /[^\n]\n\n[^\n]/.test(itemText) ? 1 : 0;
-                return getPrefixedItem(itemText);
-            });
-
-        chunk.trimWhitespace(true);
-        chunk.skipLines(nLinesUp, nLinesDown, true);
-        chunk.startTag = prefix;
-        var spaces = prefix.replace(/./g, " ");
-        this.wrap(chunk, SETTINGS.lineLength - spaces.length);
-        chunk.selection = chunk.selection.replace(/\n/g, "\n" + spaces);
-
-    };
-
-    commandProto.doHeading = function (chunk, postProcessing) {
-
-        // Remove leading/trailing whitespace and reduce internal spaces to single spaces.
-        chunk.selection = chunk.selection.replace(/\s+/g, " ");
-        chunk.selection = chunk.selection.replace(/(^\s+|\s+$)/g, "");
-
-        // If we clicked the button with no selected text, we just
-        // make a level 2 hash header around some default text.
-        if (!chunk.selection) {
-            chunk.startTag = "## ";
-            chunk.selection = this.getString("headingexample");
-            chunk.endTag = " ##";
-            return;
-        }
-
-        var headerLevel = 0;     // The existing header level of the selected text.
-
-        // Remove any existing hash heading markdown and save the header level.
-        chunk.findTags(/#+[ ]*/, /[ ]*#+/);
-        if (/#+/.test(chunk.startTag)) {
-            headerLevel = re.lastMatch.length;
-        }
-        chunk.startTag = chunk.endTag = "";
-
-        // Try to get the current header level by looking for - and = in the line
-        // below the selection.
-        chunk.findTags(null, /\s?(-+|=+)/);
-        if (/=+/.test(chunk.endTag)) {
-            headerLevel = 1;
-        }
-        if (/-+/.test(chunk.endTag)) {
-            headerLevel = 2;
-        }
-
-        // Skip to the next line so we can create the header markdown.
-        chunk.startTag = chunk.endTag = "";
-        chunk.skipLines(1, 1);
-
-        // We make a level 2 header if there is no current header.
-        // If there is a header level, we substract one from the header level.
-        // If it's already a level 1 header, it's removed.
-        var headerLevelToCreate = headerLevel == 0 ? 2 : headerLevel - 1;
-
-        if (headerLevelToCreate > 0) {
-
-            // The button only creates level 1 and 2 underline headers.
-            // Why not have it iterate over hash header levels?  Wouldn't that be easier and cleaner?
-            var headerChar = headerLevelToCreate >= 2 ? "-" : "=";
-            var len = chunk.selection.length;
-            if (len > SETTINGS.lineLength) {
-                len = SETTINGS.lineLength;
-            }
-            chunk.endTag = "\n";
-            while (len--) {
-                chunk.endTag += headerChar;
-            }
-        }
-    };
-
-    commandProto.doHorizontalRule = function (chunk, postProcessing) {
-        chunk.startTag = "----------\n";
-        chunk.selection = "";
-        chunk.skipLines(2, 1, true);
-    }
-
-    commandProto.doMore = function (chunk, postProcessing) {
-        chunk.startTag = "<!--more-->\n\n";
-        chunk.selection = "";
-        chunk.skipLines(2, 0, true);
-    }
-
-    commandProto.doTab = function (chunk, postProcessing) {
-        chunk.startTag = "    ";
-        chunk.selection = "";
-    }
-
-    function FullScreenManager (hooks, getString) {
-        this.fullScreenBind = false;
-        this.hooks = hooks;
-        this.getString = getString;
-        this.isFakeFullScreen = false;
-    }
-
-    function getFullScreenAdapter () {
-        var selector = {
-            fullScreenChange : ['onfullscreenchange', 'onwebkitfullscreenchange', 'onmozfullscreenchange', 'onmsfullscreenchange'],
-            requestFullscreen : ['requestFullscreen', 'webkitRequestFullScreen', 'mozRequestFullScreen', 'msRequestFullScreen'],
-            cancelFullscreen : ['cancelFullscreen', 'exitFullScreen', 'webkitCancelFullScreen', 'mozCancelFullScreen', 'msCancelFullScreen']
-        }, adapter = {};
-
-        for (var name in selector) {
-            var len = selector[name].length, found = false;
-
-            for (var i = 0; i < len; i ++) {
-                var method = selector[name][i];
-
-                if ('undefined' != typeof(document[method]) || 'undefined' != typeof(document.body[method])) {
-                    adapter[name] = method;
-                    found = true;
-                    break;
-                }
-            }
-
-            if (!found) {
-                return false;
-            }
-        }
-
-        return adapter;
-    };
-
-    function isFullScreen () {
-        return document.fullScreen || 
-            document.mozFullScreen || 
-            document.webkitIsFullScreen ||
-            document.msIsFullScreen;
-    };
-
-    // fullscreen
-    FullScreenManager.prototype.doFullScreen = function (buttons, enter) {
-        var adapter = getFullScreenAdapter(), self = this;
-
-        if (!adapter) {
-            alert(self.getString('fullscreenUnsupport'));
-            return false;
-        }
-
-        if (!this.fullScreenBind) {
-            util.addEvent(document, adapter.fullScreenChange.substring(2), function () {
-                if (!isFullScreen()) {
-                    buttons.fullscreen.style.display = '';
-                    buttons.exitFullscreen.style.display = 'none';
-                    self.hooks.exitFullScreen();
-                } else {
-                    buttons.fullscreen.style.display = 'none';
-                    buttons.exitFullscreen.style.display = '';
-                    self.hooks.enterFullScreen();
-                }
-            });
-
-            this.fullScreenBind = true;
-        }
-
-        if (enter) {
-            if (self.isFakeFullScreen) {
-                document.body[adapter.requestFullscreen]('webkitRequestFullScreen' == adapter.requestFullscreen 
-                    ? Element.ALLOW_KEYBOARD_INPUT : null);
-                self.isFakeFullScreen = false;
-            } else if (!isFullScreen()) {
-                buttons.exitFullscreen.style.display = '';
-                self.hooks.enterFakeFullScreen();
-                self.isFakeFullScreen = true;
-            }
-        } else {
-            if (self.isFakeFullScreen) {
-                buttons.exitFullscreen.style.display = 'none';
-                self.hooks.exitFullScreen();
-            } else if (isFullScreen()) {
-                document[adapter.cancelFullscreen]();
-            }
-            
-            self.isFakeFullScreen = false;
-        }
-    };
-})();
diff --git a/admin/js/marked.js b/admin/js/marked.js
new file mode 100644
index 00000000..8fce0a2f
--- /dev/null
+++ b/admin/js/marked.js
@@ -0,0 +1,1168 @@
+/**
+ * marked - a markdown parser
+ * Copyright (c) 2011-2013, Christopher Jeffrey. (MIT Licensed)
+ * https://github.com/chjj/marked
+ */
+
+;(function() {
+
+/**
+ * Block-Level Grammar
+ */
+
+var block = {
+  newline: /^\n+/,
+  code: /^( {4}[^\n]+\n*)+/,
+  fences: noop,
+  hr: /^( *[-*_]){3,} *(?:\n+|$)/,
+  heading: /^ *(#{1,6}) *([^\n]+?) *#* *(?:\n+|$)/,
+  nptable: noop,
+  lheading: /^([^\n]+)\n *(=|-){2,} *(?:\n+|$)/,
+  blockquote: /^( *>[^\n]+(\n[^\n]+)*\n*)+/,
+  list: /^( *)(bull) [\s\S]+?(?:hr|\n{2,}(?! )(?!\1bull )\n*|\s*$)/,
+  html: /^ *(?:comment|closed|closing) *(?:\n{2,}|\s*$)/,
+  def: /^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +["(]([^\n]+)[")])? *(?:\n+|$)/,
+  table: noop,
+  paragraph: /^((?:[^\n]+\n?(?!hr|heading|lheading|blockquote|tag|def))+)\n*/,
+  text: /^[^\n]+/
+};
+
+block.bullet = /(?:[*+-]|\d+\.)/;
+block.item = /^( *)(bull) [^\n]*(?:\n(?!\1bull )[^\n]*)*/;
+block.item = replace(block.item, 'gm')
+  (/bull/g, block.bullet)
+  ();
+
+block.list = replace(block.list)
+  (/bull/g, block.bullet)
+  ('hr', /\n+(?=(?: *[-*_]){3,} *(?:\n+|$))/)
+  ();
+
+block._tag = '(?!(?:'
+  + 'a|em|strong|small|s|cite|q|dfn|abbr|data|time|code'
+  + '|var|samp|kbd|sub|sup|i|b|u|mark|ruby|rt|rp|bdi|bdo'
+  + '|span|br|wbr|ins|del|img)\\b)\\w+(?!:/|@)\\b';
+
+block.html = replace(block.html)
+  ('comment', /<!--[\s\S]*?-->/)
+  ('closed', /<(tag)[\s\S]+?<\/\1>/)
+  ('closing', /<tag(?:"[^"]*"|'[^']*'|[^'">])*?>/)
+  (/tag/g, block._tag)
+  ();
+
+block.paragraph = replace(block.paragraph)
+  ('hr', block.hr)
+  ('heading', block.heading)
+  ('lheading', block.lheading)
+  ('blockquote', block.blockquote)
+  ('tag', '<' + block._tag)
+  ('def', block.def)
+  ();
+
+/**
+ * Normal Block Grammar
+ */
+
+block.normal = merge({}, block);
+
+/**
+ * GFM Block Grammar
+ */
+
+block.gfm = merge({}, block.normal, {
+  fences: /^ *(`{3,}|~{3,}) *(\S+)? *\n([\s\S]+?)\s*\1 *(?:\n+|$)/,
+  paragraph: /^/
+});
+
+block.gfm.paragraph = replace(block.paragraph)
+  ('(?!', '(?!'
+    + block.gfm.fences.source.replace('\\1', '\\2') + '|'
+    + block.list.source.replace('\\1', '\\3') + '|')
+  ();
+
+/**
+ * GFM + Tables Block Grammar
+ */
+
+block.tables = merge({}, block.gfm, {
+  nptable: /^ *(\S.*\|.*)\n *([-:]+ *\|[-| :]*)\n((?:.*\|.*(?:\n|$))*)\n*/,
+  table: /^ *\|(.+)\n *\|( *[-:]+[-| :]*)\n((?: *\|.*(?:\n|$))*)\n*/
+});
+
+/**
+ * Block Lexer
+ */
+
+function Lexer(options) {
+  this.tokens = [];
+  this.tokens.links = {};
+  this.options = options || marked.defaults;
+  this.rules = block.normal;
+
+  if (this.options.gfm) {
+    if (this.options.tables) {
+      this.rules = block.tables;
+    } else {
+      this.rules = block.gfm;
+    }
+  }
+}
+
+/**
+ * Expose Block Rules
+ */
+
+Lexer.rules = block;
+
+/**
+ * Static Lex Method
+ */
+
+Lexer.lex = function(src, options) {
+  var lexer = new Lexer(options);
+  return lexer.lex(src);
+};
+
+/**
+ * Preprocessing
+ */
+
+Lexer.prototype.lex = function(src) {
+  src = src
+    .replace(/\r\n|\r/g, '\n')
+    .replace(/\t/g, '    ')
+    .replace(/\u00a0/g, ' ')
+    .replace(/\u2424/g, '\n');
+
+  return this.token(src, true);
+};
+
+/**
+ * Lexing
+ */
+
+Lexer.prototype.token = function(src, top) {
+  var src = src.replace(/^ +$/gm, '')
+    , next
+    , loose
+    , cap
+    , bull
+    , b
+    , item
+    , space
+    , i
+    , l;
+
+  while (src) {
+    // newline
+    if (cap = this.rules.newline.exec(src)) {
+      src = src.substring(cap[0].length);
+      if (cap[0].length > 1) {
+        this.tokens.push({
+          type: 'space'
+        });
+      }
+    }
+
+    // code
+    if (cap = this.rules.code.exec(src)) {
+      src = src.substring(cap[0].length);
+      cap = cap[0].replace(/^ {4}/gm, '');
+      this.tokens.push({
+        type: 'code',
+        text: !this.options.pedantic
+          ? cap.replace(/\n+$/, '')
+          : cap
+      });
+      continue;
+    }
+
+    // fences (gfm)
+    if (cap = this.rules.fences.exec(src)) {
+      src = src.substring(cap[0].length);
+      this.tokens.push({
+        type: 'code',
+        lang: cap[2],
+        text: cap[3]
+      });
+      continue;
+    }
+
+    // heading
+    if (cap = this.rules.heading.exec(src)) {
+      src = src.substring(cap[0].length);
+      this.tokens.push({
+        type: 'heading',
+        depth: cap[1].length,
+        text: cap[2]
+      });
+      continue;
+    }
+
+    // table no leading pipe (gfm)
+    if (top && (cap = this.rules.nptable.exec(src))) {
+      src = src.substring(cap[0].length);
+
+      item = {
+        type: 'table',
+        header: cap[1].replace(/^ *| *\| *$/g, '').split(/ *\| */),
+        align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
+        cells: cap[3].replace(/\n$/, '').split('\n')
+      };
+
+      for (i = 0; i < item.align.length; i++) {
+        if (/^ *-+: *$/.test(item.align[i])) {
+          item.align[i] = 'right';
+        } else if (/^ *:-+: *$/.test(item.align[i])) {
+          item.align[i] = 'center';
+        } else if (/^ *:-+ *$/.test(item.align[i])) {
+          item.align[i] = 'left';
+        } else {
+          item.align[i] = null;
+        }
+      }
+
+      for (i = 0; i < item.cells.length; i++) {
+        item.cells[i] = item.cells[i].split(/ *\| */);
+      }
+
+      this.tokens.push(item);
+
+      continue;
+    }
+
+    // lheading
+    if (cap = this.rules.lheading.exec(src)) {
+      src = src.substring(cap[0].length);
+      this.tokens.push({
+        type: 'heading',
+        depth: cap[2] === '=' ? 1 : 2,
+        text: cap[1]
+      });
+      continue;
+    }
+
+    // hr
+    if (cap = this.rules.hr.exec(src)) {
+      src = src.substring(cap[0].length);
+      this.tokens.push({
+        type: 'hr'
+      });
+      continue;
+    }
+
+    // blockquote
+    if (cap = this.rules.blockquote.exec(src)) {
+      src = src.substring(cap[0].length);
+
+      this.tokens.push({
+        type: 'blockquote_start'
+      });
+
+      cap = cap[0].replace(/^ *> ?/gm, '');
+
+      // Pass `top` to keep the current
+      // "toplevel" state. This is exactly
+      // how markdown.pl works.
+      this.token(cap, top);
+
+      this.tokens.push({
+        type: 'blockquote_end'
+      });
+
+      continue;
+    }
+
+    // list
+    if (cap = this.rules.list.exec(src)) {
+      src = src.substring(cap[0].length);
+      bull = cap[2];
+
+      this.tokens.push({
+        type: 'list_start',
+        ordered: bull.length > 1
+      });
+
+      // Get each top-level item.
+      cap = cap[0].match(this.rules.item);
+
+      next = false;
+      l = cap.length;
+      i = 0;
+
+      for (; i < l; i++) {
+        item = cap[i];
+
+        // Remove the list item's bullet
+        // so it is seen as the next token.
+        space = item.length;
+        item = item.replace(/^ *([*+-]|\d+\.) +/, '');
+
+        // Outdent whatever the
+        // list item contains. Hacky.
+        if (~item.indexOf('\n ')) {
+          space -= item.length;
+          item = !this.options.pedantic
+            ? item.replace(new RegExp('^ {1,' + space + '}', 'gm'), '')
+            : item.replace(/^ {1,4}/gm, '');
+        }
+
+        // Determine whether the next list item belongs here.
+        // Backpedal if it does not belong in this list.
+        if (this.options.smartLists && i !== l - 1) {
+          b = block.bullet.exec(cap[i + 1])[0];
+          if (bull !== b && !(bull.length > 1 && b.length > 1)) {
+            src = cap.slice(i + 1).join('\n') + src;
+            i = l - 1;
+          }
+        }
+
+        // Determine whether item is loose or not.
+        // Use: /(^|\n)(?! )[^\n]+\n\n(?!\s*$)/
+        // for discount behavior.
+        loose = next || /\n\n(?!\s*$)/.test(item);
+        if (i !== l - 1) {
+          next = item.charAt(item.length - 1) === '\n';
+          if (!loose) loose = next;
+        }
+
+        this.tokens.push({
+          type: loose
+            ? 'loose_item_start'
+            : 'list_item_start'
+        });
+
+        // Recurse.
+        this.token(item, false);
+
+        this.tokens.push({
+          type: 'list_item_end'
+        });
+      }
+
+      this.tokens.push({
+        type: 'list_end'
+      });
+
+      continue;
+    }
+
+    // html
+    if (cap = this.rules.html.exec(src)) {
+      src = src.substring(cap[0].length);
+      this.tokens.push({
+        type: this.options.sanitize
+          ? 'paragraph'
+          : 'html',
+        pre: cap[1] === 'pre' || cap[1] === 'script' || cap[1] === 'style',
+        text: cap[0]
+      });
+      continue;
+    }
+
+    // def
+    if (top && (cap = this.rules.def.exec(src))) {
+      src = src.substring(cap[0].length);
+      this.tokens.links[cap[1].toLowerCase()] = {
+        href: cap[2],
+        title: cap[3]
+      };
+      continue;
+    }
+
+    // table (gfm)
+    if (top && (cap = this.rules.table.exec(src))) {
+      src = src.substring(cap[0].length);
+
+      item = {
+        type: 'table',
+        header: cap[1].replace(/^ *| *\| *$/g, '').split(/ *\| */),
+        align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
+        cells: cap[3].replace(/(?: *\| *)?\n$/, '').split('\n')
+      };
+
+      for (i = 0; i < item.align.length; i++) {
+        if (/^ *-+: *$/.test(item.align[i])) {
+          item.align[i] = 'right';
+        } else if (/^ *:-+: *$/.test(item.align[i])) {
+          item.align[i] = 'center';
+        } else if (/^ *:-+ *$/.test(item.align[i])) {
+          item.align[i] = 'left';
+        } else {
+          item.align[i] = null;
+        }
+      }
+
+      for (i = 0; i < item.cells.length; i++) {
+        item.cells[i] = item.cells[i]
+          .replace(/^ *\| *| *\| *$/g, '')
+          .split(/ *\| */);
+      }
+
+      this.tokens.push(item);
+
+      continue;
+    }
+
+    // top-level paragraph
+    if (top && (cap = this.rules.paragraph.exec(src))) {
+      src = src.substring(cap[0].length);
+      this.tokens.push({
+        type: 'paragraph',
+        text: cap[1].charAt(cap[1].length - 1) === '\n'
+          ? cap[1].slice(0, -1)
+          : cap[1]
+      });
+      continue;
+    }
+
+    // text
+    if (cap = this.rules.text.exec(src)) {
+      // Top-level should never reach here.
+      src = src.substring(cap[0].length);
+      this.tokens.push({
+        type: 'text',
+        text: cap[0]
+      });
+      continue;
+    }
+
+    if (src) {
+      throw new
+        Error('Infinite loop on byte: ' + src.charCodeAt(0));
+    }
+  }
+
+  return this.tokens;
+};
+
+/**
+ * Inline-Level Grammar
+ */
+
+var inline = {
+  escape: /^\\([\\`*{}\[\]()#+\-.!_>])/,
+  autolink: /^<([^ >]+(@|:\/)[^ >]+)>/,
+  url: noop,
+  tag: /^<!--[\s\S]*?-->|^<\/?\w+(?:"[^"]*"|'[^']*'|[^'">])*?>/,
+  link: /^!?\[(inside)\]\(href\)/,
+  reflink: /^!?\[(inside)\]\s*\[([^\]]*)\]/,
+  nolink: /^!?\[((?:\[[^\]]*\]|[^\[\]])*)\]/,
+  strong: /^__([\s\S]+?)__(?!_)|^\*\*([\s\S]+?)\*\*(?!\*)/,
+  em: /^\b_((?:__|[\s\S])+?)_\b|^\*((?:\*\*|[\s\S])+?)\*(?!\*)/,
+  code: /^(`+)\s*([\s\S]*?[^`])\s*\1(?!`)/,
+  br: /^ {2,}\n(?!\s*$)/,
+  del: noop,
+  text: /^[\s\S]+?(?=[\\<!\[_*`]| {2,}\n|$)/
+};
+
+inline._inside = /(?:\[[^\]]*\]|[^\[\]]|\](?=[^\[]*\]))*/;
+inline._href = /\s*<?([\s\S]*?)>?(?:\s+['"]([\s\S]*?)['"])?\s*/;
+
+inline.link = replace(inline.link)
+  ('inside', inline._inside)
+  ('href', inline._href)
+  ();
+
+inline.reflink = replace(inline.reflink)
+  ('inside', inline._inside)
+  ();
+
+/**
+ * Normal Inline Grammar
+ */
+
+inline.normal = merge({}, inline);
+
+/**
+ * Pedantic Inline Grammar
+ */
+
+inline.pedantic = merge({}, inline.normal, {
+  strong: /^__(?=\S)([\s\S]*?\S)__(?!_)|^\*\*(?=\S)([\s\S]*?\S)\*\*(?!\*)/,
+  em: /^_(?=\S)([\s\S]*?\S)_(?!_)|^\*(?=\S)([\s\S]*?\S)\*(?!\*)/
+});
+
+/**
+ * GFM Inline Grammar
+ */
+
+inline.gfm = merge({}, inline.normal, {
+  escape: replace(inline.escape)('])', '~|])')(),
+  url: /^(https?:\/\/[^\s<]+[^<.,:;"')\]\s])/,
+  del: /^~~(?=\S)([\s\S]*?\S)~~/,
+  text: replace(inline.text)
+    (']|', '~]|')
+    ('|', '|https?://|')
+    ()
+});
+
+/**
+ * GFM + Line Breaks Inline Grammar
+ */
+
+inline.breaks = merge({}, inline.gfm, {
+  br: replace(inline.br)('{2,}', '*')(),
+  text: replace(inline.gfm.text)('{2,}', '*')()
+});
+
+/**
+ * Inline Lexer & Compiler
+ */
+
+function InlineLexer(links, options) {
+  this.options = options || marked.defaults;
+  this.links = links;
+  this.rules = inline.normal;
+
+  if (!this.links) {
+    throw new
+      Error('Tokens array requires a `links` property.');
+  }
+
+  if (this.options.gfm) {
+    if (this.options.breaks) {
+      this.rules = inline.breaks;
+    } else {
+      this.rules = inline.gfm;
+    }
+  } else if (this.options.pedantic) {
+    this.rules = inline.pedantic;
+  }
+}
+
+/**
+ * Expose Inline Rules
+ */
+
+InlineLexer.rules = inline;
+
+/**
+ * Static Lexing/Compiling Method
+ */
+
+InlineLexer.output = function(src, links, options) {
+  var inline = new InlineLexer(links, options);
+  return inline.output(src);
+};
+
+/**
+ * Lexing/Compiling
+ */
+
+InlineLexer.prototype.output = function(src) {
+  var out = ''
+    , link
+    , text
+    , href
+    , cap;
+
+  while (src) {
+    // escape
+    if (cap = this.rules.escape.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += cap[1];
+      continue;
+    }
+
+    // autolink
+    if (cap = this.rules.autolink.exec(src)) {
+      src = src.substring(cap[0].length);
+      if (cap[2] === '@') {
+        text = cap[1].charAt(6) === ':'
+          ? this.mangle(cap[1].substring(7))
+          : this.mangle(cap[1]);
+        href = this.mangle('mailto:') + text;
+      } else {
+        text = escape(cap[1]);
+        href = text;
+      }
+      out += '<a href="'
+        + href
+        + '">'
+        + text
+        + '</a>';
+      continue;
+    }
+
+    // url (gfm)
+    if (cap = this.rules.url.exec(src)) {
+      src = src.substring(cap[0].length);
+      text = escape(cap[1]);
+      href = text;
+      out += '<a href="'
+        + href
+        + '">'
+        + text
+        + '</a>';
+      continue;
+    }
+
+    // tag
+    if (cap = this.rules.tag.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += this.options.sanitize
+        ? escape(cap[0])
+        : cap[0];
+      continue;
+    }
+
+    // link
+    if (cap = this.rules.link.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += this.outputLink(cap, {
+        href: cap[2],
+        title: cap[3]
+      });
+      continue;
+    }
+
+    // reflink, nolink
+    if ((cap = this.rules.reflink.exec(src))
+        || (cap = this.rules.nolink.exec(src))) {
+      src = src.substring(cap[0].length);
+      link = (cap[2] || cap[1]).replace(/\s+/g, ' ');
+      link = this.links[link.toLowerCase()];
+      if (!link || !link.href) {
+        out += cap[0].charAt(0);
+        src = cap[0].substring(1) + src;
+        continue;
+      }
+      out += this.outputLink(cap, link);
+      continue;
+    }
+
+    // strong
+    if (cap = this.rules.strong.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += '<strong>'
+        + this.output(cap[2] || cap[1])
+        + '</strong>';
+      continue;
+    }
+
+    // em
+    if (cap = this.rules.em.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += '<em>'
+        + this.output(cap[2] || cap[1])
+        + '</em>';
+      continue;
+    }
+
+    // code
+    if (cap = this.rules.code.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += '<code>'
+        + escape(cap[2], true)
+        + '</code>';
+      continue;
+    }
+
+    // br
+    if (cap = this.rules.br.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += '<br>';
+      continue;
+    }
+
+    // del (gfm)
+    if (cap = this.rules.del.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += '<del>'
+        + this.output(cap[1])
+        + '</del>';
+      continue;
+    }
+
+    // text
+    if (cap = this.rules.text.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += escape(this.smartypants(cap[0]));
+      continue;
+    }
+
+    if (src) {
+      throw new
+        Error('Infinite loop on byte: ' + src.charCodeAt(0));
+    }
+  }
+
+  return out;
+};
+
+/**
+ * Compile Link
+ */
+
+InlineLexer.prototype.outputLink = function(cap, link) {
+  if (cap[0].charAt(0) !== '!') {
+    return '<a href="'
+      + escape(link.href)
+      + '"'
+      + (link.title
+      ? ' title="'
+      + escape(link.title)
+      + '"'
+      : '')
+      + '>'
+      + this.output(cap[1])
+      + '</a>';
+  } else {
+    return '<img src="'
+      + escape(link.href)
+      + '" alt="'
+      + escape(cap[1])
+      + '"'
+      + (link.title
+      ? ' title="'
+      + escape(link.title)
+      + '"'
+      : '')
+      + '>';
+  }
+};
+
+/**
+ * Smartypants Transformations
+ */
+
+InlineLexer.prototype.smartypants = function(text) {
+  if (!this.options.smartypants) return text;
+  return text
+    // em-dashes
+    .replace(/--/g, '\u2014')
+    // opening singles
+    .replace(/(^|[-\u2014/(\[{"\s])'/g, '$1\u2018')
+    // closing singles & apostrophes
+    .replace(/'/g, '\u2019')
+    // opening doubles
+    .replace(/(^|[-\u2014/(\[{\u2018\s])"/g, '$1\u201c')
+    // closing doubles
+    .replace(/"/g, '\u201d')
+    // ellipses
+    .replace(/\.{3}/g, '\u2026');
+};
+
+/**
+ * Mangle Links
+ */
+
+InlineLexer.prototype.mangle = function(text) {
+  var out = ''
+    , l = text.length
+    , i = 0
+    , ch;
+
+  for (; i < l; i++) {
+    ch = text.charCodeAt(i);
+    if (Math.random() > 0.5) {
+      ch = 'x' + ch.toString(16);
+    }
+    out += '&#' + ch + ';';
+  }
+
+  return out;
+};
+
+/**
+ * Parsing & Compiling
+ */
+
+function Parser(options) {
+  this.tokens = [];
+  this.token = null;
+  this.options = options || marked.defaults;
+}
+
+/**
+ * Static Parse Method
+ */
+
+Parser.parse = function(src, options) {
+  var parser = new Parser(options);
+  return parser.parse(src);
+};
+
+/**
+ * Parse Loop
+ */
+
+Parser.prototype.parse = function(src) {
+  this.inline = new InlineLexer(src.links, this.options);
+  this.tokens = src.reverse();
+
+  var out = '';
+  while (this.next()) {
+    out += this.tok();
+  }
+
+  return out;
+};
+
+/**
+ * Next Token
+ */
+
+Parser.prototype.next = function() {
+  return this.token = this.tokens.pop();
+};
+
+/**
+ * Preview Next Token
+ */
+
+Parser.prototype.peek = function() {
+  return this.tokens[this.tokens.length - 1] || 0;
+};
+
+/**
+ * Parse Text Tokens
+ */
+
+Parser.prototype.parseText = function() {
+  var body = this.token.text;
+
+  while (this.peek().type === 'text') {
+    body += '\n' + this.next().text;
+  }
+
+  return this.inline.output(body);
+};
+
+/**
+ * Parse Current Token
+ */
+
+Parser.prototype.tok = function() {
+  switch (this.token.type) {
+    case 'space': {
+      return '';
+    }
+    case 'hr': {
+      return '<hr>\n';
+    }
+    case 'heading': {
+      return '<h'
+        + this.token.depth
+        + ' id="'
+        + this.options.headerPrefix
+        + this.token.text.toLowerCase().replace(/[^\w]+/g, '-')
+        + '">'
+        + this.inline.output(this.token.text)
+        + '</h'
+        + this.token.depth
+        + '>\n';
+    }
+    case 'code': {
+      if (this.options.highlight) {
+        var code = this.options.highlight(this.token.text, this.token.lang);
+        if (code != null && code !== this.token.text) {
+          this.token.escaped = true;
+          this.token.text = code;
+        }
+      }
+
+      if (!this.token.escaped) {
+        this.token.text = escape(this.token.text, true);
+      }
+
+      return '<pre><code'
+        + (this.token.lang
+        ? ' class="'
+        + this.options.langPrefix
+        + this.token.lang
+        + '"'
+        : '')
+        + '>'
+        + this.token.text
+        + '</code></pre>\n';
+    }
+    case 'table': {
+      var body = ''
+        , heading
+        , i
+        , row
+        , cell
+        , j;
+
+      // header
+      body += '<thead>\n<tr>\n';
+      for (i = 0; i < this.token.header.length; i++) {
+        heading = this.inline.output(this.token.header[i]);
+        body += '<th';
+        if (this.token.align[i]) {
+          body += ' style="text-align:' + this.token.align[i] + '"';
+        }
+        body += '>' + heading + '</th>\n';
+      }
+      body += '</tr>\n</thead>\n';
+
+      // body
+      body += '<tbody>\n'
+      for (i = 0; i < this.token.cells.length; i++) {
+        row = this.token.cells[i];
+        body += '<tr>\n';
+        for (j = 0; j < row.length; j++) {
+          cell = this.inline.output(row[j]);
+          body += '<td';
+          if (this.token.align[j]) {
+            body += ' style="text-align:' + this.token.align[j] + '"';
+          }
+          body += '>' + cell + '</td>\n';
+        }
+        body += '</tr>\n';
+      }
+      body += '</tbody>\n';
+
+      return '<table>\n'
+        + body
+        + '</table>\n';
+    }
+    case 'blockquote_start': {
+      var body = '';
+
+      while (this.next().type !== 'blockquote_end') {
+        body += this.tok();
+      }
+
+      return '<blockquote>\n'
+        + body
+        + '</blockquote>\n';
+    }
+    case 'list_start': {
+      var type = this.token.ordered ? 'ol' : 'ul'
+        , body = '';
+
+      while (this.next().type !== 'list_end') {
+        body += this.tok();
+      }
+
+      return '<'
+        + type
+        + '>\n'
+        + body
+        + '</'
+        + type
+        + '>\n';
+    }
+    case 'list_item_start': {
+      var body = '';
+
+      while (this.next().type !== 'list_item_end') {
+        body += this.token.type === 'text'
+          ? this.parseText()
+          : this.tok();
+      }
+
+      return '<li>'
+        + body
+        + '</li>\n';
+    }
+    case 'loose_item_start': {
+      var body = '';
+
+      while (this.next().type !== 'list_item_end') {
+        body += this.tok();
+      }
+
+      return '<li>'
+        + body
+        + '</li>\n';
+    }
+    case 'html': {
+      return !this.token.pre && !this.options.pedantic
+        ? this.inline.output(this.token.text)
+        : this.token.text;
+    }
+    case 'paragraph': {
+      return '<p>'
+        + this.inline.output(this.token.text)
+        + '</p>\n';
+    }
+    case 'text': {
+      return '<p>'
+        + this.parseText()
+        + '</p>\n';
+    }
+  }
+};
+
+/**
+ * Helpers
+ */
+
+function escape(html, encode) {
+  return html
+    .replace(!encode ? /&(?!#?\w+;)/g : /&/g, '&amp;')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+    .replace(/"/g, '&quot;')
+    .replace(/'/g, '&#39;');
+}
+
+function replace(regex, opt) {
+  regex = regex.source;
+  opt = opt || '';
+  return function self(name, val) {
+    if (!name) return new RegExp(regex, opt);
+    val = val.source || val;
+    val = val.replace(/(^|[^\[])\^/g, '$1');
+    regex = regex.replace(name, val);
+    return self;
+  };
+}
+
+function noop() {}
+noop.exec = noop;
+
+function merge(obj) {
+  var i = 1
+    , target
+    , key;
+
+  for (; i < arguments.length; i++) {
+    target = arguments[i];
+    for (key in target) {
+      if (Object.prototype.hasOwnProperty.call(target, key)) {
+        obj[key] = target[key];
+      }
+    }
+  }
+
+  return obj;
+}
+
+/**
+ * Marked
+ */
+
+function marked(src, opt, callback) {
+  if (callback || typeof opt === 'function') {
+    if (!callback) {
+      callback = opt;
+      opt = null;
+    }
+
+    opt = merge({}, marked.defaults, opt || {});
+
+    var highlight = opt.highlight
+      , tokens
+      , pending
+      , i = 0;
+
+    try {
+      tokens = Lexer.lex(src, opt)
+    } catch (e) {
+      return callback(e);
+    }
+
+    pending = tokens.length;
+
+    var done = function() {
+      var out, err;
+
+      try {
+        out = Parser.parse(tokens, opt);
+      } catch (e) {
+        err = e;
+      }
+
+      opt.highlight = highlight;
+
+      return err
+        ? callback(err)
+        : callback(null, out);
+    };
+
+    if (!highlight || highlight.length < 3) {
+      return done();
+    }
+
+    delete opt.highlight;
+
+    if (!pending) return done();
+
+    for (; i < tokens.length; i++) {
+      (function(token) {
+        if (token.type !== 'code') {
+          return --pending || done();
+        }
+        return highlight(token.text, token.lang, function(err, code) {
+          if (code == null || code === token.text) {
+            return --pending || done();
+          }
+          token.text = code;
+          token.escaped = true;
+          --pending || done();
+        });
+      })(tokens[i]);
+    }
+
+    return;
+  }
+  try {
+    if (opt) opt = merge({}, marked.defaults, opt);
+    return Parser.parse(Lexer.lex(src, opt), opt);
+  } catch (e) {
+    e.message += '\nPlease report this to https://github.com/chjj/marked.';
+    if ((opt || marked.defaults).silent) {
+      return '<p>An error occured:</p><pre>'
+        + escape(e.message + '', true)
+        + '</pre>';
+    }
+    throw e;
+  }
+}
+
+/**
+ * Options
+ */
+
+marked.options =
+marked.setOptions = function(opt) {
+  merge(marked.defaults, opt);
+  return marked;
+};
+
+marked.defaults = {
+  gfm: true,
+  tables: true,
+  breaks: false,
+  pedantic: false,
+  sanitize: false,
+  smartLists: false,
+  silent: false,
+  highlight: null,
+  langPrefix: 'lang-',
+  smartypants: false,
+  headerPrefix: ''
+};
+
+/**
+ * Expose
+ */
+
+marked.Parser = Parser;
+marked.parser = Parser.parse;
+
+marked.Lexer = Lexer;
+marked.lexer = Lexer.lex;
+
+marked.InlineLexer = InlineLexer;
+marked.inlineLexer = InlineLexer.output;
+
+marked.parse = marked;
+
+if (typeof exports === 'object') {
+  module.exports = marked;
+} else if (typeof define === 'function' && define.amd) {
+  define(function() { return marked; });
+} else {
+  this.marked = marked;
+}
+
+}).call(function() {
+  return this || (typeof window !== 'undefined' ? window : global);
+}());
+
diff --git a/admin/js/pagedown.js b/admin/js/pagedown.js
new file mode 100644
index 00000000..09f23510
--- /dev/null
+++ b/admin/js/pagedown.js
@@ -0,0 +1,2426 @@
+// needs Markdown.Converter.js at the moment
+var Markdown = {};
+
+(function () {
+    function identity(x) { return x; }
+    function returnFalse(x) { return false; }
+
+    function HookCollection() { }
+
+    HookCollection.prototype = {
+
+        chain: function (hookname, func) {
+            var original = this[hookname];
+            if (!original)
+                throw new Error("unknown hook " + hookname);
+
+            if (original === identity)
+                this[hookname] = func;
+            else
+                this[hookname] = function (text) {
+                    var args = Array.prototype.slice.call(arguments, 0);
+                    args[0] = original.apply(null, args);
+                    return func.apply(null, args);
+                };
+        },
+        set: function (hookname, func) {
+            if (!this[hookname])
+                throw new Error("unknown hook " + hookname);
+            this[hookname] = func;
+        },
+        addNoop: function (hookname) {
+            this[hookname] = identity;
+        },
+        addFalse: function (hookname) {
+            this[hookname] = returnFalse;
+        }
+    };
+
+    Markdown.HookCollection = HookCollection;
+
+
+    var util = {},
+        position = {},
+        ui = {},
+        doc = window.document,
+        re = window.RegExp,
+        nav = window.navigator,
+        SETTINGS = { lineLength: 72 },
+
+    // Used to work around some browser bugs where we can't use feature testing.
+        uaSniffed = {
+            isIE: /msie/.test(nav.userAgent.toLowerCase()),
+            isIE_5or6: /msie 6/.test(nav.userAgent.toLowerCase()) || /msie 5/.test(nav.userAgent.toLowerCase()),
+            isOpera: /opera/.test(nav.userAgent.toLowerCase())
+        };
+
+    var defaultsStrings = {
+        bold: "Strong <strong> Ctrl+B",
+        boldexample: "strong text",
+
+        italic: "Emphasis <em> Ctrl+I",
+        italicexample: "emphasized text",
+
+        link: "Hyperlink <a> Ctrl+L",
+        linkdescription: "enter link description here",
+        linkdialog: "<p><b>Insert Hyperlink</b></p><p>http://example.com/ \"optional title\"</p>",
+        linkname: null,
+
+        quote: "Blockquote <blockquote> Ctrl+Q",
+        quoteexample: "Blockquote",
+
+        code: "Code Sample <pre><code> Ctrl+K",
+        codeexample: "enter code here",
+
+        image: "Image <img> Ctrl+G",
+        imagedescription: "enter image description here",
+        imagedialog: "<p><b>Insert Image</b></p><p>http://example.com/images/diagram.jpg \"optional title\"<br>Need <a href='http://www.google.com/search?q=free+image+hosting' target='_blank'>free image hosting?</a></p>",
+        imagename: null,
+
+        olist: "Numbered List <ol> Ctrl+O",
+        ulist: "Bulleted List <ul> Ctrl+U",
+        litem: "List item",
+
+        heading: "Heading <h1>/<h2> Ctrl+H",
+        headingexample: "Heading",
+        more: "More contents <!--more--> Ctrl+M",
+
+        fullscreen: 'FullScreen Ctrl+J',
+        exitFullscreen: 'Exit FullScreen Ctrl+E',
+        fullscreenUnsupport: 'Sorry, the browser dont support fullscreen api',
+
+        hr: "Horizontal Rule <hr> Ctrl+R",
+
+        undo: "Undo - Ctrl+Z",
+        redo: "Redo - Ctrl+Y",
+        redomac: "Redo - Ctrl+Shift+Z",
+
+        ok: "OK",
+        cancel: "Cancel",
+
+        help: "Markdown Editing Help"
+    };
+
+
+    // -------------------------------------------------------------------
+    //  YOUR CHANGES GO HERE
+    //
+    // I've tried to localize the things you are likely to change to
+    // this area.
+    // -------------------------------------------------------------------
+
+    // The default text that appears in the dialog input box when entering
+    // links.
+    var imageDefaultText = "http://";
+    var linkDefaultText = "http://";
+
+    // -------------------------------------------------------------------
+    //  END OF YOUR CHANGES
+    // -------------------------------------------------------------------
+
+    // options, if given, can have the following properties:
+    //   options.helpButton = { handler: yourEventHandler }
+    //   options.strings = { italicexample: "slanted text" }
+    // `yourEventHandler` is the click handler for the help button.
+    // If `options.helpButton` isn't given, not help button is created.
+    // `options.strings` can have any or all of the same properties as
+    // `defaultStrings` above, so you can just override some string displayed
+    // to the user on a case-by-case basis, or translate all strings to
+    // a different language.
+    //
+    // For backwards compatibility reasons, the `options` argument can also
+    // be just the `helpButton` object, and `strings.help` can also be set via
+    // `helpButton.title`. This should be considered legacy.
+    //
+    // The constructed editor object has the methods:
+    // - getConverter() returns the markdown converter object that was passed to the constructor
+    // - run() actually starts the editor; should be called after all necessary plugins are registered. Calling this more than once is a no-op.
+    // - refreshPreview() forces the preview to be updated. This method is only available after run() was called.
+    Markdown.Editor = function (markdownConverter, idPostfix, options) {
+
+        options = options || {};
+
+        if (typeof options.handler === "function") { //backwards compatible behavior
+            options = { helpButton: options };
+        }
+        options.strings = options.strings || {};
+        if (options.helpButton) {
+            options.strings.help = options.strings.help || options.helpButton.title;
+        }
+        var getString = function (identifier) {
+            var string = options.strings[identifier] || defaultsStrings[identifier];
+
+            if ('imagename' == identifier || 'linkname' == identifier) {
+                options.strings[identifier] = null;
+            }
+
+            return string;
+        }
+
+        idPostfix = idPostfix || "";
+
+        var hooks = this.hooks = new Markdown.HookCollection();
+        hooks.addNoop("onPreviewRefresh");       // called with no arguments after the preview has been refreshed
+        hooks.addNoop("postBlockquoteCreation"); // called with the user's selection *after* the blockquote was created; should return the actual to-be-inserted text
+        hooks.addFalse("insertImageDialog");     /* called with one parameter: a callback to be called with the URL of the image. If the application creates
+                                                  * its own image insertion dialog, this hook should return true, and the callback should be called with the chosen
+                                                  * image url (or null if the user cancelled). If this hook returns false, the default dialog will be used.
+                                                  */
+        hooks.addFalse("insertLinkDialog");     /* called with one parameter: a callback to be called with the URL of the image. If the application creates
+                                                  * its own image insertion dialog, this hook should return true, and the callback should be called with the chosen
+                                                  * image url (or null if the user cancelled). If this hook returns false, the default dialog will be used.
+                                                  */
+        hooks.addNoop("enterFullScreen");
+        hooks.addNoop("enterFakeFullScreen");
+        hooks.addNoop("exitFullScreen");
+        hooks.addNoop("postMarkdown");
+
+        this.getConverter = function () { return markdownConverter; }
+
+        var that = this,
+            panels;
+
+        this.run = function () {
+            if (panels)
+                return; // already initialized
+
+            panels = new PanelCollection(idPostfix);
+            var commandManager = new CommandManager(hooks, getString);
+            var previewManager = new PreviewManager(markdownConverter, panels,
+                function (text) { return hooks.postMarkdown(text); }, function () { hooks.onPreviewRefresh(); });
+            var undoManager, uiManager;
+
+            if (!/\?noundo/.test(doc.location.href)) {
+                undoManager = new UndoManager(function () {
+                    previewManager.refresh();
+                    if (uiManager) // not available on the first call
+                        uiManager.setUndoRedoButtonStates();
+                }, panels);
+                this.textOperation = function (f) {
+                    undoManager.setCommandMode();
+                    f();
+                    that.refreshPreview();
+                }
+            }
+            
+            fullScreenManager = new FullScreenManager(hooks, getString);
+            uiManager = new UIManager(idPostfix, panels, undoManager, previewManager, commandManager, fullScreenManager, options.helpButton, getString);
+            uiManager.setUndoRedoButtonStates();
+
+            var forceRefresh = that.refreshPreview = function () { previewManager.refresh(true); };
+
+            forceRefresh();
+        };
+
+    }
+
+    // before: contains all the text in the input box BEFORE the selection.
+    // after: contains all the text in the input box AFTER the selection.
+    function Chunks() { }
+
+    // startRegex: a regular expression to find the start tag
+    // endRegex: a regular expresssion to find the end tag
+    Chunks.prototype.findTags = function (startRegex, endRegex) {
+
+        var chunkObj = this;
+        var regex;
+
+        if (startRegex) {
+
+            regex = util.extendRegExp(startRegex, "", "$");
+
+            this.before = this.before.replace(regex,
+                function (match) {
+                    chunkObj.startTag = chunkObj.startTag + match;
+                    return "";
+                });
+
+            regex = util.extendRegExp(startRegex, "^", "");
+
+            this.selection = this.selection.replace(regex,
+                function (match) {
+                    chunkObj.startTag = chunkObj.startTag + match;
+                    return "";
+                });
+        }
+
+        if (endRegex) {
+
+            regex = util.extendRegExp(endRegex, "", "$");
+
+            this.selection = this.selection.replace(regex,
+                function (match) {
+                    chunkObj.endTag = match + chunkObj.endTag;
+                    return "";
+                });
+
+            regex = util.extendRegExp(endRegex, "^", "");
+
+            this.after = this.after.replace(regex,
+                function (match) {
+                    chunkObj.endTag = match + chunkObj.endTag;
+                    return "";
+                });
+        }
+    };
+
+    // If remove is false, the whitespace is transferred
+    // to the before/after regions.
+    //
+    // If remove is true, the whitespace disappears.
+    Chunks.prototype.trimWhitespace = function (remove) {
+        var beforeReplacer, afterReplacer, that = this;
+        if (remove) {
+            beforeReplacer = afterReplacer = "";
+        } else {
+            beforeReplacer = function (s) { that.before += s; return ""; }
+            afterReplacer = function (s) { that.after = s + that.after; return ""; }
+        }
+
+        this.selection = this.selection.replace(/^(\s*)/, beforeReplacer).replace(/(\s*)$/, afterReplacer);
+    };
+
+
+    Chunks.prototype.skipLines = function (nLinesBefore, nLinesAfter, findExtraNewlines) {
+
+        if (nLinesBefore === undefined) {
+            nLinesBefore = 1;
+        }
+
+        if (nLinesAfter === undefined) {
+            nLinesAfter = 1;
+        }
+
+        nLinesBefore++;
+        nLinesAfter++;
+
+        var regexText;
+        var replacementText;
+
+        // chrome bug ... documented at: http://meta.stackoverflow.com/questions/63307/blockquote-glitch-in-editor-in-chrome-6-and-7/65985#65985
+        if (navigator.userAgent.match(/Chrome/)) {
+            "X".match(/()./);
+        }
+
+        this.selection = this.selection.replace(/(^\n*)/, "");
+
+        this.startTag = this.startTag + re.$1;
+
+        this.selection = this.selection.replace(/(\n*$)/, "");
+        this.endTag = this.endTag + re.$1;
+        this.startTag = this.startTag.replace(/(^\n*)/, "");
+        this.before = this.before + re.$1;
+        this.endTag = this.endTag.replace(/(\n*$)/, "");
+        this.after = this.after + re.$1;
+
+        if (this.before) {
+
+            regexText = replacementText = "";
+
+            while (nLinesBefore--) {
+                regexText += "\\n?";
+                replacementText += "\n";
+            }
+
+            if (findExtraNewlines) {
+                regexText = "\\n*";
+            }
+            this.before = this.before.replace(new re(regexText + "$", ""), replacementText);
+        }
+
+        if (this.after) {
+
+            regexText = replacementText = "";
+
+            while (nLinesAfter--) {
+                regexText += "\\n?";
+                replacementText += "\n";
+            }
+            if (findExtraNewlines) {
+                regexText = "\\n*";
+            }
+
+            this.after = this.after.replace(new re(regexText, ""), replacementText);
+        }
+    };
+
+    // end of Chunks
+
+    // A collection of the important regions on the page.
+    // Cached so we don't have to keep traversing the DOM.
+    // Also holds ieCachedRange and ieCachedScrollTop, where necessary; working around
+    // this issue:
+    // Internet explorer has problems with CSS sprite buttons that use HTML
+    // lists.  When you click on the background image "button", IE will
+    // select the non-existent link text and discard the selection in the
+    // textarea.  The solution to this is to cache the textarea selection
+    // on the button's mousedown event and set a flag.  In the part of the
+    // code where we need to grab the selection, we check for the flag
+    // and, if it's set, use the cached area instead of querying the
+    // textarea.
+    //
+    // This ONLY affects Internet Explorer (tested on versions 6, 7
+    // and 8) and ONLY on button clicks.  Keyboard shortcuts work
+    // normally since the focus never leaves the textarea.
+    function PanelCollection(postfix) {
+        this.buttonBar = doc.getElementById("wmd-button-bar" + postfix);
+        this.preview = doc.getElementById("wmd-preview" + postfix);
+        this.input = doc.getElementById("text");
+    };
+
+    // Returns true if the DOM element is visible, false if it's hidden.
+    // Checks if display is anything other than none.
+    util.isVisible = function (elem) {
+
+        if (window.getComputedStyle) {
+            // Most browsers
+            return window.getComputedStyle(elem, null).getPropertyValue("display") !== "none";
+        }
+        else if (elem.currentStyle) {
+            // IE
+            return elem.currentStyle["display"] !== "none";
+        }
+    };
+
+
+    // Adds a listener callback to a DOM element which is fired on a specified
+    // event.
+    util.addEvent = function (elem, event, listener) {
+        if (elem.attachEvent) {
+            // IE only.  The "on" is mandatory.
+            elem.attachEvent("on" + event, listener);
+        }
+        else {
+            // Other browsers.
+            elem.addEventListener(event, listener, false);
+        }
+    };
+
+
+    // Removes a listener callback from a DOM element which is fired on a specified
+    // event.
+    util.removeEvent = function (elem, event, listener) {
+        if (elem.detachEvent) {
+            // IE only.  The "on" is mandatory.
+            elem.detachEvent("on" + event, listener);
+        }
+        else {
+            // Other browsers.
+            elem.removeEventListener(event, listener, false);
+        }
+    };
+
+    // Converts \r\n and \r to \n.
+    util.fixEolChars = function (text) {
+        text = text.replace(/\r\n/g, "\n");
+        text = text.replace(/\r/g, "\n");
+        return text;
+    };
+
+    // Extends a regular expression.  Returns a new RegExp
+    // using pre + regex + post as the expression.
+    // Used in a few functions where we have a base
+    // expression and we want to pre- or append some
+    // conditions to it (e.g. adding "$" to the end).
+    // The flags are unchanged.
+    //
+    // regex is a RegExp, pre and post are strings.
+    util.extendRegExp = function (regex, pre, post) {
+
+        if (pre === null || pre === undefined) {
+            pre = "";
+        }
+        if (post === null || post === undefined) {
+            post = "";
+        }
+
+        var pattern = regex.toString();
+        var flags;
+
+        // Replace the flags with empty space and store them.
+        pattern = pattern.replace(/\/([gim]*)$/, function (wholeMatch, flagsPart) {
+            flags = flagsPart;
+            return "";
+        });
+
+        // Remove the slash delimiters on the regular expression.
+        pattern = pattern.replace(/(^\/|\/$)/g, "");
+        pattern = pre + pattern + post;
+
+        return new re(pattern, flags);
+    }
+
+    // UNFINISHED
+    // The assignment in the while loop makes jslint cranky.
+    // I'll change it to a better loop later.
+    position.getTop = function (elem, isInner) {
+        var result = elem.offsetTop;
+        if (!isInner) {
+            while (elem = elem.offsetParent) {
+                result += elem.offsetTop;
+            }
+        }
+        return result;
+    };
+
+    position.getHeight = function (elem) {
+        return elem.offsetHeight || elem.scrollHeight;
+    };
+
+    position.getWidth = function (elem) {
+        return elem.offsetWidth || elem.scrollWidth;
+    };
+
+    position.getPageSize = function () {
+
+        var scrollWidth, scrollHeight;
+        var innerWidth, innerHeight;
+
+        // It's not very clear which blocks work with which browsers.
+        if (self.innerHeight && self.scrollMaxY) {
+            scrollWidth = doc.body.scrollWidth;
+            scrollHeight = self.innerHeight + self.scrollMaxY;
+        }
+        else if (doc.body.scrollHeight > doc.body.offsetHeight) {
+            scrollWidth = doc.body.scrollWidth;
+            scrollHeight = doc.body.scrollHeight;
+        }
+        else {
+            scrollWidth = doc.body.offsetWidth;
+            scrollHeight = doc.body.offsetHeight;
+        }
+
+        if (self.innerHeight) {
+            // Non-IE browser
+            innerWidth = self.innerWidth;
+            innerHeight = self.innerHeight;
+        }
+        else if (doc.documentElement && doc.documentElement.clientHeight) {
+            // Some versions of IE (IE 6 w/ a DOCTYPE declaration)
+            innerWidth = doc.documentElement.clientWidth;
+            innerHeight = doc.documentElement.clientHeight;
+        }
+        else if (doc.body) {
+            // Other versions of IE
+            innerWidth = doc.body.clientWidth;
+            innerHeight = doc.body.clientHeight;
+        }
+
+        var maxWidth = Math.max(scrollWidth, innerWidth);
+        var maxHeight = Math.max(scrollHeight, innerHeight);
+        return [maxWidth, maxHeight, innerWidth, innerHeight];
+    };
+
+    // Handles pushing and popping TextareaStates for undo/redo commands.
+    // I should rename the stack variables to list.
+    function UndoManager(callback, panels) {
+
+        var undoObj = this;
+        var undoStack = []; // A stack of undo states
+        var stackPtr = 0; // The index of the current state
+        var mode = "none";
+        var lastState; // The last state
+        var timer; // The setTimeout handle for cancelling the timer
+        var inputStateObj;
+
+        // Set the mode for later logic steps.
+        var setMode = function (newMode, noSave) {
+            if (mode != newMode) {
+                mode = newMode;
+                if (!noSave) {
+                    saveState();
+                }
+            }
+
+            if (!uaSniffed.isIE || mode != "moving") {
+                timer = setTimeout(refreshState, 1);
+            }
+            else {
+                inputStateObj = null;
+            }
+        };
+
+        var refreshState = function (isInitialState) {
+            inputStateObj = new TextareaState(panels, isInitialState);
+            timer = undefined;
+        };
+
+        this.setCommandMode = function () {
+            mode = "command";
+            saveState();
+            timer = setTimeout(refreshState, 0);
+        };
+
+        this.canUndo = function () {
+            return stackPtr > 1;
+        };
+
+        this.canRedo = function () {
+            if (undoStack[stackPtr + 1]) {
+                return true;
+            }
+            return false;
+        };
+
+        // Removes the last state and restores it.
+        this.undo = function () {
+
+            if (undoObj.canUndo()) {
+                if (lastState) {
+                    // What about setting state -1 to null or checking for undefined?
+                    lastState.restore();
+                    lastState = null;
+                }
+                else {
+                    undoStack[stackPtr] = new TextareaState(panels);
+                    undoStack[--stackPtr].restore();
+
+                    if (callback) {
+                        callback();
+                    }
+                }
+            }
+
+            mode = "none";
+            panels.input.focus();
+            refreshState();
+        };
+
+        // Redo an action.
+        this.redo = function () {
+
+            if (undoObj.canRedo()) {
+
+                undoStack[++stackPtr].restore();
+
+                if (callback) {
+                    callback();
+                }
+            }
+
+            mode = "none";
+            panels.input.focus();
+            refreshState();
+        };
+
+        // Push the input area state to the stack.
+        var saveState = function () {
+            var currState = inputStateObj || new TextareaState(panels);
+
+            if (!currState) {
+                return false;
+            }
+            if (mode == "moving") {
+                if (!lastState) {
+                    lastState = currState;
+                }
+                return;
+            }
+            if (lastState) {
+                if (undoStack[stackPtr - 1].text != lastState.text) {
+                    undoStack[stackPtr++] = lastState;
+                }
+                lastState = null;
+            }
+            undoStack[stackPtr++] = currState;
+            undoStack[stackPtr + 1] = null;
+            if (callback) {
+                callback();
+            }
+        };
+
+        var handleCtrlYZ = function (event) {
+
+            var handled = false;
+
+            if ((event.ctrlKey || event.metaKey) && !event.altKey) {
+
+                // IE and Opera do not support charCode.
+                var keyCode = event.charCode || event.keyCode;
+                var keyCodeChar = String.fromCharCode(keyCode);
+
+                switch (keyCodeChar.toLowerCase()) {
+
+                    case "y":
+                        undoObj.redo();
+                        handled = true;
+                        break;
+
+                    case "z":
+                        if (!event.shiftKey) {
+                            undoObj.undo();
+                        }
+                        else {
+                            undoObj.redo();
+                        }
+                        handled = true;
+                        break;
+                }
+            }
+
+            if (handled) {
+                if (event.preventDefault) {
+                    event.preventDefault();
+                }
+                if (window.event) {
+                    window.event.returnValue = false;
+                }
+                return;
+            }
+        };
+
+        // Set the mode depending on what is going on in the input area.
+        var handleModeChange = function (event) {
+
+            if (!event.ctrlKey && !event.metaKey) {
+
+                var keyCode = event.keyCode;
+
+                if ((keyCode >= 33 && keyCode <= 40) || (keyCode >= 63232 && keyCode <= 63235)) {
+                    // 33 - 40: page up/dn and arrow keys
+                    // 63232 - 63235: page up/dn and arrow keys on safari
+                    setMode("moving");
+                }
+                else if (keyCode == 8 || keyCode == 46 || keyCode == 127) {
+                    // 8: backspace
+                    // 46: delete
+                    // 127: delete
+                    setMode("deleting");
+                }
+                else if (keyCode == 13) {
+                    // 13: Enter
+                    setMode("newlines");
+                }
+                else if (keyCode == 27) {
+                    // 27: escape
+                    setMode("escape");
+                }
+                else if ((keyCode < 16 || keyCode > 20) && keyCode != 91) {
+                    // 16-20 are shift, etc.
+                    // 91: left window key
+                    // I think this might be a little messed up since there are
+                    // a lot of nonprinting keys above 20.
+                    setMode("typing");
+                }
+            }
+        };
+
+        var setEventHandlers = function () {
+            util.addEvent(panels.input, "keypress", function (event) {
+                // keyCode 89: y
+                // keyCode 90: z
+                if ((event.ctrlKey || event.metaKey) && !event.altKey && (event.keyCode == 89 || event.keyCode == 90)) {
+                    event.preventDefault();
+                }
+            });
+
+            var handlePaste = function () {
+                if (uaSniffed.isIE || (inputStateObj && inputStateObj.text != panels.input.value)) {
+                    if (timer == undefined) {
+                        mode = "paste";
+                        saveState();
+                        refreshState();
+                    }
+                }
+            };
+
+            util.addEvent(panels.input, "keydown", handleCtrlYZ);
+            util.addEvent(panels.input, "keydown", handleModeChange);
+            util.addEvent(panels.input, "mousedown", function () {
+                setMode("moving");
+            });
+
+            panels.input.onpaste = handlePaste;
+            panels.input.ondrop = handlePaste;
+        };
+
+        var init = function () {
+            setEventHandlers();
+            refreshState(true);
+            saveState();
+        };
+
+        init();
+    }
+
+    // end of UndoManager
+
+    // The input textarea state/contents.
+    // This is used to implement undo/redo by the undo manager.
+    function TextareaState(panels, isInitialState) {
+
+        // Aliases
+        var stateObj = this;
+        var inputArea = panels.input;
+        this.init = function () {
+            if (!util.isVisible(inputArea)) {
+                return;
+            }
+            if (!isInitialState && doc.activeElement && doc.activeElement !== inputArea) { // this happens when tabbing out of the input box
+                return;
+            }
+
+            this.setInputAreaSelectionStartEnd();
+            this.scrollTop = inputArea.scrollTop;
+            if (!this.text && inputArea.selectionStart || inputArea.selectionStart === 0) {
+                this.text = inputArea.value;
+            }
+
+        }
+
+        // Sets the selected text in the input box after we've performed an
+        // operation.
+        this.setInputAreaSelection = function () {
+
+            if (!util.isVisible(inputArea)) {
+                return;
+            }
+
+            if (inputArea.selectionStart !== undefined && !uaSniffed.isOpera) {
+
+                inputArea.focus();
+                inputArea.selectionStart = stateObj.start;
+                inputArea.selectionEnd = stateObj.end;
+                inputArea.scrollTop = stateObj.scrollTop;
+            }
+            else if (doc.selection) {
+
+                if (doc.activeElement && doc.activeElement !== inputArea) {
+                    return;
+                }
+
+                inputArea.focus();
+                var range = inputArea.createTextRange();
+                range.moveStart("character", -inputArea.value.length);
+                range.moveEnd("character", -inputArea.value.length);
+                range.moveEnd("character", stateObj.end);
+                range.moveStart("character", stateObj.start);
+                range.select();
+            }
+        };
+
+        this.setInputAreaSelectionStartEnd = function () {
+
+            if (!panels.ieCachedRange && (inputArea.selectionStart || inputArea.selectionStart === 0)) {
+
+                stateObj.start = inputArea.selectionStart;
+                stateObj.end = inputArea.selectionEnd;
+            }
+            else if (doc.selection) {
+
+                stateObj.text = util.fixEolChars(inputArea.value);
+
+                // IE loses the selection in the textarea when buttons are
+                // clicked.  On IE we cache the selection. Here, if something is cached,
+                // we take it.
+                var range = panels.ieCachedRange || doc.selection.createRange();
+
+                var fixedRange = util.fixEolChars(range.text);
+                var marker = "\x07";
+                var markedRange = marker + fixedRange + marker;
+                range.text = markedRange;
+                var inputText = util.fixEolChars(inputArea.value);
+
+                range.moveStart("character", -markedRange.length);
+                range.text = fixedRange;
+
+                stateObj.start = inputText.indexOf(marker);
+                stateObj.end = inputText.lastIndexOf(marker) - marker.length;
+
+                var len = stateObj.text.length - util.fixEolChars(inputArea.value).length;
+
+                if (len) {
+                    range.moveStart("character", -fixedRange.length);
+                    while (len--) {
+                        fixedRange += "\n";
+                        stateObj.end += 1;
+                    }
+                    range.text = fixedRange;
+                }
+
+                if (panels.ieCachedRange)
+                    stateObj.scrollTop = panels.ieCachedScrollTop; // this is set alongside with ieCachedRange
+
+                panels.ieCachedRange = null;
+
+                this.setInputAreaSelection();
+            }
+        };
+
+        // Restore this state into the input area.
+        this.restore = function () {
+
+            if (stateObj.text != undefined && stateObj.text != inputArea.value) {
+                inputArea.value = stateObj.text;
+            }
+            this.setInputAreaSelection();
+            inputArea.scrollTop = stateObj.scrollTop;
+        };
+
+        // Gets a collection of HTML chunks from the inptut textarea.
+        this.getChunks = function () {
+
+            var chunk = new Chunks();
+            chunk.before = util.fixEolChars(stateObj.text.substring(0, stateObj.start));
+            chunk.startTag = "";
+            chunk.selection = util.fixEolChars(stateObj.text.substring(stateObj.start, stateObj.end));
+            chunk.endTag = "";
+            chunk.after = util.fixEolChars(stateObj.text.substring(stateObj.end));
+            chunk.scrollTop = stateObj.scrollTop;
+
+            return chunk;
+        };
+
+        // Sets the TextareaState properties given a chunk of markdown.
+        this.setChunks = function (chunk) {
+
+            chunk.before = chunk.before + chunk.startTag;
+            chunk.after = chunk.endTag + chunk.after;
+
+            this.start = chunk.before.length;
+            this.end = chunk.before.length + chunk.selection.length;
+            this.text = chunk.before + chunk.selection + chunk.after;
+            this.scrollTop = chunk.scrollTop;
+        };
+        this.init();
+    };
+
+    function PreviewManager(converter, panels, previewMarkdownFilter, previewRefreshCallback) {
+
+        var managerObj = this;
+        var timeout;
+        var elapsedTime;
+        var oldInputText;
+        var maxDelay = 3000;
+        var startType = "delayed"; // The other legal value is "manual"
+
+        // Adds event listeners to elements
+        var setupEvents = function (inputElem, listener) {
+
+            util.addEvent(inputElem, "input", listener);
+            inputElem.onpaste = listener;
+            inputElem.ondrop = listener;
+
+            util.addEvent(inputElem, "keypress", listener);
+            util.addEvent(inputElem, "keydown", listener);
+        };
+
+        var getDocScrollTop = function () {
+
+            var result = 0;
+
+            if (window.innerHeight) {
+                result = window.pageYOffset;
+            }
+            else
+                if (doc.documentElement && doc.documentElement.scrollTop) {
+                    result = doc.documentElement.scrollTop;
+                }
+                else
+                    if (doc.body) {
+                        result = doc.body.scrollTop;
+                    }
+
+            return result;
+        };
+
+        var makePreviewHtml = function () {
+
+            // If there is no registered preview panel
+            // there is nothing to do.
+            if (!panels.preview)
+                return;
+
+
+            var text = panels.input.value;
+            if (text && text == oldInputText) {
+                return; // Input text hasn't changed.
+            }
+            else {
+                oldInputText = text;
+            }
+
+            var prevTime = new Date().getTime();
+
+            text = previewMarkdownFilter(converter(text));
+
+            // Calculate the processing time of the HTML creation.
+            // It's used as the delay time in the event listener.
+            var currTime = new Date().getTime();
+            elapsedTime = currTime - prevTime;
+
+            pushPreviewHtml(text);
+        };
+
+        // setTimeout is already used.  Used as an event listener.
+        var applyTimeout = function () {
+
+            if (timeout) {
+                clearTimeout(timeout);
+                timeout = undefined;
+            }
+
+            if (startType !== "manual") {
+
+                var delay = 0;
+
+                if (startType === "delayed") {
+                    delay = elapsedTime;
+                }
+
+                if (delay > maxDelay) {
+                    delay = maxDelay;
+                }
+                timeout = setTimeout(makePreviewHtml, delay);
+            }
+        };
+
+        var getScaleFactor = function (panel) {
+            if (panel.scrollHeight <= panel.clientHeight) {
+                return 1;
+            }
+            return panel.scrollTop / (panel.scrollHeight - panel.clientHeight);
+        };
+
+        var setPanelScrollTops = function () {
+            if (panels.preview) {
+                panels.preview.scrollTop = (panels.preview.scrollHeight - panels.preview.clientHeight) * getScaleFactor(panels.preview);
+            }
+        };
+
+        this.refresh = function (requiresRefresh) {
+
+            if (requiresRefresh) {
+                oldInputText = "";
+                makePreviewHtml();
+            }
+            else {
+                applyTimeout();
+            }
+        };
+
+        this.processingTime = function () {
+            return elapsedTime;
+        };
+
+        var isFirstTimeFilled = true;
+
+        // IE doesn't let you use innerHTML if the element is contained somewhere in a table
+        // (which is the case for inline editing) -- in that case, detach the element, set the
+        // value, and reattach. Yes, that *is* ridiculous.
+        var ieSafePreviewSet = function (text) {
+            var preview = panels.preview;
+            var parent = preview.parentNode;
+            var sibling = preview.nextSibling;
+            parent.removeChild(preview);
+            preview.innerHTML = text;
+            if (!sibling)
+                parent.appendChild(preview);
+            else
+                parent.insertBefore(preview, sibling);
+        }
+
+        var nonSuckyBrowserPreviewSet = function (text) {
+            panels.preview.innerHTML = text;
+        }
+
+        var previewSetter;
+
+        var previewSet = function (text) {
+            if (previewSetter)
+                return previewSetter(text);
+
+            try {
+                nonSuckyBrowserPreviewSet(text);
+                previewSetter = nonSuckyBrowserPreviewSet;
+            } catch (e) {
+                previewSetter = ieSafePreviewSet;
+                previewSetter(text);
+            }
+        };
+
+        var pushPreviewHtml = function (text) {
+
+            var emptyTop = position.getTop(panels.input) - getDocScrollTop();
+
+            if (panels.preview) {
+                previewSet(text);
+                previewRefreshCallback();
+            }
+
+            setPanelScrollTops();
+
+            if (isFirstTimeFilled) {
+                isFirstTimeFilled = false;
+                return;
+            }
+
+            var fullTop = position.getTop(panels.input) - getDocScrollTop();
+
+            if (uaSniffed.isIE) {
+                setTimeout(function () {
+                    window.scrollBy(0, fullTop - emptyTop);
+                }, 0);
+            }
+            else {
+                window.scrollBy(0, fullTop - emptyTop);
+            }
+        };
+
+        var init = function () {
+
+            setupEvents(panels.input, applyTimeout);
+            makePreviewHtml();
+
+            if (panels.preview) {
+                panels.preview.scrollTop = 0;
+            }
+        };
+
+        init();
+    };
+
+    // Creates the background behind the hyperlink text entry box.
+    // And download dialog
+    // Most of this has been moved to CSS but the div creation and
+    // browser-specific hacks remain here.
+    ui.createBackground = function () {
+
+        var background = doc.createElement("div"),
+            style = background.style;
+
+        background.className = "wmd-prompt-background";
+
+        style.position = "absolute";
+        style.top = "0";
+
+        style.zIndex = "1000";
+
+        if (uaSniffed.isIE) {
+            style.filter = "alpha(opacity=50)";
+        }
+        else {
+            style.opacity = "0.5";
+        }
+
+        var pageSize = position.getPageSize();
+        style.height = pageSize[1] + "px";
+
+        if (uaSniffed.isIE) {
+            style.left = doc.documentElement.scrollLeft;
+            style.width = doc.documentElement.clientWidth;
+        }
+        else {
+            style.left = "0";
+            style.width = "100%";
+        }
+
+        doc.body.appendChild(background);
+        return background;
+    };
+
+    // This simulates a modal dialog box and asks for the URL when you
+    // click the hyperlink or image buttons.
+    //
+    // text: The html for the input box.
+    // defaultInputText: The default value that appears in the input box.
+    // callback: The function which is executed when the prompt is dismissed, either via OK or Cancel.
+    //      It receives a single argument; either the entered text (if OK was chosen) or null (if Cancel
+    //      was chosen).
+    ui.prompt = function (text, defaultInputText, callback, ok, cancel) {
+
+        // These variables need to be declared at this level since they are used
+        // in multiple functions.
+        var dialog;         // The dialog box.
+        var input;         // The text box where you enter the hyperlink.
+
+
+        if (defaultInputText === undefined) {
+            defaultInputText = "";
+        }
+
+        // Used as a keydown event handler. Esc dismisses the prompt.
+        // Key code 27 is ESC.
+        var checkEscape = function (key) {
+            var code = (key.charCode || key.keyCode);
+            if (code === 27) {
+                close(true);
+            }
+        };
+
+        // Dismisses the hyperlink input box.
+        // isCancel is true if we don't care about the input text.
+        // isCancel is false if we are going to keep the text.
+        var close = function (isCancel) {
+            util.removeEvent(doc.body, "keydown", checkEscape);
+            var text = input.value;
+
+            if (isCancel) {
+                text = null;
+            }
+            else {
+                // Fixes common pasting errors.
+                text = text.replace(/^http:\/\/(https?|ftp):\/\//, '$1://');
+                if (!/^(?:https?|ftp):\/\//.test(text))
+                    text = 'http://' + text;
+            }
+
+            dialog.parentNode.removeChild(dialog);
+
+            callback(text);
+            return false;
+        };
+
+
+
+        // Create the text input box form/window.
+        var createDialog = function () {
+
+            // The main dialog box.
+            dialog = doc.createElement("div");
+            dialog.className = "wmd-prompt-dialog";
+            /*
+            dialog.style.padding = "10px;";
+            dialog.style.position = "fixed";
+            dialog.style.width = "400px";
+            dialog.style.zIndex = "1001";
+            */
+
+            // The dialog text.
+            var question = doc.createElement("div");
+            question.innerHTML = text;
+            // question.style.padding = "5px";
+            dialog.appendChild(question);
+
+            // The web form container for the text box and buttons.
+            var form = doc.createElement("form"),
+                style = form.style;
+            form.onsubmit = function () { return close(false); };
+            /*
+            style.padding = "0";
+            style.margin = "0";
+            style.cssFloat = "left";
+            style.width = "100%";
+            style.textAlign = "center";
+            style.position = "relative";
+            */
+            dialog.appendChild(form);
+
+            // The input text box
+            input = doc.createElement("input");
+            input.type = "text";
+            input.value = defaultInputText;
+            /*
+            style = input.style;
+            style.display = "block";
+            style.width = "80%";
+            style.marginLeft = style.marginRight = "auto";
+            */
+            form.appendChild(input);
+
+            // The ok button
+            var okButton = doc.createElement("button");
+            okButton.type = "button";
+            okButton.className = "btn-s primary";
+            okButton.onclick = function () { return close(false); };
+            okButton.innerHTML = ok;
+            /*
+            style = okButton.style;
+            style.margin = "10px";
+            style.display = "inline";
+            style.width = "7em";
+            */
+
+            // The cancel button
+            var cancelButton = doc.createElement("button");
+            cancelButton.type = "button";
+            cancelButton.className = "btn-s";
+            cancelButton.onclick = function () { return close(true); };
+            cancelButton.innerHTML = cancel;
+            /*
+            style = cancelButton.style;
+            style.margin = "10px";
+            style.display = "inline";
+            style.width = "7em";
+            */
+
+            form.appendChild(okButton);
+            form.appendChild(cancelButton);
+
+            util.addEvent(doc.body, "keydown", checkEscape);
+            /*
+            dialog.style.top = "50%";
+            dialog.style.left = "50%";
+            dialog.style.display = "block";
+            if (uaSniffed.isIE_5or6) {
+                dialog.style.position = "absolute";
+                dialog.style.top = doc.documentElement.scrollTop + 200 + "px";
+                dialog.style.left = "50%";
+            }
+            */
+            doc.body.appendChild(dialog);
+
+            // This has to be done AFTER adding the dialog to the form if you
+            // want it to be centered.
+            /*
+            dialog.style.marginTop = -(position.getHeight(dialog) / 2) + "px";
+            dialog.style.marginLeft = -(position.getWidth(dialog) / 2) + "px";
+            */
+
+        };
+
+        // Why is this in a zero-length timeout?
+        // Is it working around a browser bug?
+        setTimeout(function () {
+
+            createDialog();
+
+            var defTextLen = defaultInputText.length;
+            if (input.selectionStart !== undefined) {
+                input.selectionStart = 0;
+                input.selectionEnd = defTextLen;
+            }
+            else if (input.createTextRange) {
+                var range = input.createTextRange();
+                range.collapse(false);
+                range.moveStart("character", -defTextLen);
+                range.moveEnd("character", defTextLen);
+                range.select();
+            }
+
+            input.focus();
+        }, 0);
+    };
+
+    function UIManager(postfix, panels, undoManager, previewManager, commandManager, fullScreenManager, helpOptions, getString) {
+
+        var inputBox = panels.input,
+            buttons = {}; // buttons.undo, buttons.link, etc. The actual DOM elements.
+
+        makeSpritedButtonRow();
+
+        var keyEvent = "keydown";
+        if (uaSniffed.isOpera) {
+            keyEvent = "keypress";
+        }
+
+        util.addEvent(inputBox, keyEvent, function (key) {
+            // Check to see if we have a button key and, if so execute the callback.
+            if ((key.ctrlKey || key.metaKey) && !key.altKey && !key.shiftKey) {
+
+                var keyCode = key.charCode || key.keyCode;
+                var keyCodeStr = String.fromCharCode(keyCode).toLowerCase();
+
+                switch (keyCodeStr) {
+                    case "b":
+                        doClick(buttons.bold);
+                        break;
+                    case "i":
+                        doClick(buttons.italic);
+                        break;
+                    case "l":
+                        doClick(buttons.link);
+                        break;
+                    case "q":
+                        doClick(buttons.quote);
+                        break;
+                    case "k":
+                        doClick(buttons.code);
+                        break;
+                    case "g":
+                        doClick(buttons.image);
+                        break;
+                    case "o":
+                        doClick(buttons.olist);
+                        break;
+                    case "u":
+                        doClick(buttons.ulist);
+                        break;
+                    case 'm':
+                        doClick(buttons.more);
+                        break;
+                    case 'j':
+                        doClick(buttons.fullscreen);
+                        break;
+                    case 'e':
+                        doClick(buttons.exitFullscreen);
+                        break;
+                    case "h":
+                        doClick(buttons.heading);
+                        break;
+                    case "r":
+                        doClick(buttons.hr);
+                        break;
+                    case "y":
+                        doClick(buttons.redo);
+                        break;
+                    case "z":
+                        if (key.shiftKey) {
+                            doClick(buttons.redo);
+                        }
+                        else {
+                            doClick(buttons.undo);
+                        }
+                        break;
+                    default:
+                        return;
+                }
+
+
+                if (key.preventDefault) {
+                    key.preventDefault();
+                }
+
+                if (window.event) {
+                    window.event.returnValue = false;
+                }
+            }else if(key.keyCode==9){
+                var tab = {};
+                tab.textOp = bindCommand("doTab");
+                doClick(tab);
+
+                if (key.preventDefault) {
+                    key.preventDefault();
+                }
+                if (window.event) {
+                    window.event.returnValue = false;
+                }
+            }
+        });
+
+        // Auto-indent on shift-enter
+        util.addEvent(inputBox, "keyup", function (key) {
+            if (key.shiftKey && !key.ctrlKey && !key.metaKey) {
+                var keyCode = key.charCode || key.keyCode;
+                // Character 13 is Enter
+                if (keyCode === 13) {
+                    var fakeButton = {};
+                    fakeButton.textOp = bindCommand("doAutoindent");
+                    doClick(fakeButton);
+                }
+            }
+        });
+
+        // special handler because IE clears the context of the textbox on ESC
+        if (uaSniffed.isIE) {
+            util.addEvent(inputBox, "keydown", function (key) {
+                var code = key.keyCode;
+                if (code === 27) {
+                    return false;
+                }
+            });
+        }
+
+
+        // Perform the button's action.
+        function doClick(button) {
+
+            inputBox.focus();
+
+            if (button.textOp) {
+
+                if (undoManager) {
+                    undoManager.setCommandMode();
+                }
+
+                var state = new TextareaState(panels);
+
+                if (!state) {
+                    return;
+                }
+
+                var chunks = state.getChunks();
+
+                // Some commands launch a "modal" prompt dialog.  Javascript
+                // can't really make a modal dialog box and the WMD code
+                // will continue to execute while the dialog is displayed.
+                // This prevents the dialog pattern I'm used to and means
+                // I can't do something like this:
+                //
+                // var link = CreateLinkDialog();
+                // makeMarkdownLink(link);
+                //
+                // Instead of this straightforward method of handling a
+                // dialog I have to pass any code which would execute
+                // after the dialog is dismissed (e.g. link creation)
+                // in a function parameter.
+                //
+                // Yes this is awkward and I think it sucks, but there's
+                // no real workaround.  Only the image and link code
+                // create dialogs and require the function pointers.
+                var fixupInputArea = function () {
+
+                    inputBox.focus();
+
+                    if (chunks) {
+                        state.setChunks(chunks);
+                    }
+
+                    state.restore();
+                    previewManager.refresh();
+                };
+
+                var noCleanup = button.textOp(chunks, fixupInputArea);
+
+                if (!noCleanup) {
+                    fixupInputArea();
+                }
+
+            }
+
+            if (button.execute) {
+                button.execute(undoManager);
+            }
+        };
+
+        function setupButton(button, isEnabled) {
+
+            var normalYShift = "0px";
+            var disabledYShift = "-20px";
+            var highlightYShift = "-40px";
+            var image = button.getElementsByTagName("span")[0];
+            if (isEnabled) {
+                image.style.backgroundPosition = button.XShift + " " + normalYShift;
+                button.onmouseover = function () {
+                    image.style.backgroundPosition = this.XShift + " " + highlightYShift;
+                };
+
+                button.onmouseout = function () {
+                    image.style.backgroundPosition = this.XShift + " " + normalYShift;
+                };
+
+                // IE tries to select the background image "button" text (it's
+                // implemented in a list item) so we have to cache the selection
+                // on mousedown.
+                if (uaSniffed.isIE) {
+                    button.onmousedown = function () {
+                        if (doc.activeElement && doc.activeElement !== panels.input) { // we're not even in the input box, so there's no selection
+                            return;
+                        }
+                        panels.ieCachedRange = document.selection.createRange();
+                        panels.ieCachedScrollTop = panels.input.scrollTop;
+                    };
+                }
+
+                if (!button.isHelp) {
+                    button.onclick = function () {
+                        if (this.onmouseout) {
+                            this.onmouseout();
+                        }
+                        doClick(this);
+                        return false;
+                    }
+                }
+            }
+            else {
+                image.style.backgroundPosition = button.XShift + " " + disabledYShift;
+                button.onmouseover = button.onmouseout = button.onclick = function () { };
+            }
+        }
+
+        function bindCommand(method) {
+            if (typeof method === "string")
+                method = commandManager[method];
+            return function () { method.apply(commandManager, arguments); }
+        }
+
+        function makeSpritedButtonRow() {
+
+            var buttonBar = panels.buttonBar;
+
+            var normalYShift = "0px";
+            var disabledYShift = "-20px";
+            var highlightYShift = "-40px";
+
+            var buttonRow = document.createElement("ul");
+            buttonRow.id = "wmd-button-row" + postfix;
+            buttonRow.className = 'wmd-button-row';
+            buttonRow = buttonBar.appendChild(buttonRow);
+            var xPosition = 0;
+            var makeButton = function (id, title, XShift, textOp) {
+                var button = document.createElement("li");
+                button.className = "wmd-button";
+                button.style.left = xPosition + "px";
+                xPosition += 25;
+                var buttonImage = document.createElement("span");
+                button.id = id + postfix;
+                button.appendChild(buttonImage);
+                button.title = title;
+                button.XShift = XShift;
+                if (textOp)
+                    button.textOp = textOp;
+                setupButton(button, true);
+                buttonRow.appendChild(button);
+                return button;
+            };
+            var makeSpacer = function (num) {
+                var spacer = document.createElement("li");
+                spacer.className = "wmd-spacer wmd-spacer" + num;
+                spacer.id = "wmd-spacer" + num + postfix;
+                buttonRow.appendChild(spacer);
+                xPosition += 25;
+            }
+
+            buttons.bold = makeButton("wmd-bold-button", getString("bold"), "0px", bindCommand("doBold"));
+            buttons.italic = makeButton("wmd-italic-button", getString("italic"), "-20px", bindCommand("doItalic"));
+            makeSpacer(1);
+            buttons.link = makeButton("wmd-link-button", getString("link"), "-40px", bindCommand(function (chunk, postProcessing) {
+                return this.doLinkOrImage(chunk, postProcessing, false);
+            }));
+            buttons.quote = makeButton("wmd-quote-button", getString("quote"), "-60px", bindCommand("doBlockquote"));
+            buttons.code = makeButton("wmd-code-button", getString("code"), "-80px", bindCommand("doCode"));
+            buttons.image = makeButton("wmd-image-button", getString("image"), "-100px", bindCommand(function (chunk, postProcessing) {
+                return this.doLinkOrImage(chunk, postProcessing, true);
+            }));
+            makeSpacer(2);
+            buttons.olist = makeButton("wmd-olist-button", getString("olist"), "-120px", bindCommand(function (chunk, postProcessing) {
+                this.doList(chunk, postProcessing, true);
+            }));
+            buttons.ulist = makeButton("wmd-ulist-button", getString("ulist"), "-140px", bindCommand(function (chunk, postProcessing) {
+                this.doList(chunk, postProcessing, false);
+            }));
+            buttons.heading = makeButton("wmd-heading-button", getString("heading"), "-160px", bindCommand("doHeading"));
+            buttons.hr = makeButton("wmd-hr-button", getString("hr"), "-180px", bindCommand("doHorizontalRule"));
+            buttons.more = makeButton("wmd-more-button", getString("more"), "-280px", bindCommand("doMore"));
+            makeSpacer(3);
+            buttons.undo = makeButton("wmd-undo-button", getString("undo"), "-200px", null);
+            buttons.undo.execute = function (manager) { if (manager) manager.undo(); };
+
+            var redoTitle = /win/.test(nav.platform.toLowerCase()) ?
+                getString("redo") :
+                getString("redomac"); // mac and other non-Windows platforms
+
+            buttons.redo = makeButton("wmd-redo-button", redoTitle, "-220px", null);
+            buttons.redo.execute = function (manager) { if (manager) manager.redo(); };
+            buttons.fullscreen = makeButton("wmd-fullscreen-button", getString("fullscreen"), "-240px", null);
+            buttons.fullscreen.execute = function () { fullScreenManager.doFullScreen(buttons, true); };
+            buttons.exitFullscreen = makeButton("wmd-exit-fullscreen-button", getString("exitFullscreen"), "-260px", null);
+            buttons.exitFullscreen.style.display = 'none';
+            buttons.exitFullscreen.execute = function () { fullScreenManager.doFullScreen(buttons, false); };
+
+            if (helpOptions) {
+                var helpButton = document.createElement("li");
+                var helpButtonImage = document.createElement("span");
+                helpButton.appendChild(helpButtonImage);
+                helpButton.className = "wmd-button wmd-help-button";
+                helpButton.id = "wmd-help-button" + postfix;
+                helpButton.XShift = "-300px";
+                helpButton.isHelp = true;
+                helpButton.style.right = "0px";
+                helpButton.title = getString("help");
+                helpButton.onclick = helpOptions.handler;
+
+                setupButton(helpButton, true);
+                buttonRow.appendChild(helpButton);
+                buttons.help = helpButton;
+            }
+
+            setUndoRedoButtonStates();
+        }
+
+        function setUndoRedoButtonStates() {
+            if (undoManager) {
+                setupButton(buttons.undo, undoManager.canUndo());
+                setupButton(buttons.redo, undoManager.canRedo());
+            }
+        };
+
+        this.setUndoRedoButtonStates = setUndoRedoButtonStates;
+
+    }
+
+    function CommandManager(pluginHooks, getString) {
+        this.hooks = pluginHooks;
+        this.getString = getString;
+    }
+
+    var commandProto = CommandManager.prototype;
+
+    // The markdown symbols - 4 spaces = code, > = blockquote, etc.
+    commandProto.prefixes = "(?:\\s{4,}|\\s*>|\\s*-\\s+|\\s*\\d+\\.|=|\\+|-|_|\\*|#|\\s*\\[[^\n]]+\\]:)";
+
+    // Remove markdown symbols from the chunk selection.
+    commandProto.unwrap = function (chunk) {
+        var txt = new re("([^\\n])\\n(?!(\\n|" + this.prefixes + "))", "g");
+        chunk.selection = chunk.selection.replace(txt, "$1 $2");
+    };
+
+    commandProto.wrap = function (chunk, len) {
+        this.unwrap(chunk);
+        var regex = new re("(.{1," + len + "})( +|$\\n?)", "gm"),
+            that = this;
+
+        chunk.selection = chunk.selection.replace(regex, function (line, marked) {
+            if (new re("^" + that.prefixes, "").test(line)) {
+                return line;
+            }
+            return marked + "\n";
+        });
+
+        chunk.selection = chunk.selection.replace(/\s+$/, "");
+    };
+
+    commandProto.doBold = function (chunk, postProcessing) {
+        return this.doBorI(chunk, postProcessing, 2, this.getString("boldexample"));
+    };
+
+    commandProto.doItalic = function (chunk, postProcessing) {
+        return this.doBorI(chunk, postProcessing, 1, this.getString("italicexample"));
+    };
+
+    // chunk: The selected region that will be enclosed with */**
+    // nStars: 1 for italics, 2 for bold
+    // insertText: If you just click the button without highlighting text, this gets inserted
+    commandProto.doBorI = function (chunk, postProcessing, nStars, insertText) {
+
+        // Get rid of whitespace and fixup newlines.
+        chunk.trimWhitespace();
+        chunk.selection = chunk.selection.replace(/\n{2,}/g, "\n");
+
+        // Look for stars before and after.  Is the chunk already marked up?
+        // note that these regex matches cannot fail
+        var starsBefore = /(\**$)/.exec(chunk.before)[0];
+        var starsAfter = /(^\**)/.exec(chunk.after)[0];
+
+        var prevStars = Math.min(starsBefore.length, starsAfter.length);
+
+        // Remove stars if we have to since the button acts as a toggle.
+        if ((prevStars >= nStars) && (prevStars != 2 || nStars != 1)) {
+            chunk.before = chunk.before.replace(re("[*]{" + nStars + "}$", ""), "");
+            chunk.after = chunk.after.replace(re("^[*]{" + nStars + "}", ""), "");
+        }
+        else if (!chunk.selection && starsAfter) {
+            // It's not really clear why this code is necessary.  It just moves
+            // some arbitrary stuff around.
+            chunk.after = chunk.after.replace(/^([*_]*)/, "");
+            chunk.before = chunk.before.replace(/(\s?)$/, "");
+            var whitespace = re.$1;
+            chunk.before = chunk.before + starsAfter + whitespace;
+        }
+        else {
+
+            // In most cases, if you don't have any selected text and click the button
+            // you'll get a selected, marked up region with the default text inserted.
+            if (!chunk.selection && !starsAfter) {
+                chunk.selection = insertText;
+            }
+
+            // Add the true markup.
+            var markup = nStars <= 1 ? "*" : "**"; // shouldn't the test be = ?
+            chunk.before = chunk.before + markup;
+            chunk.after = markup + chunk.after;
+        }
+
+        return;
+    };
+
+    commandProto.stripLinkDefs = function (text, defsToAdd) {
+
+        text = text.replace(/^[ ]{0,3}\[(\d+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+|$)/gm,
+            function (totalMatch, id, link, newlines, title) {
+                defsToAdd[id] = totalMatch.replace(/\s*$/, "");
+                if (newlines) {
+                    // Strip the title and return that separately.
+                    defsToAdd[id] = totalMatch.replace(/["(](.+?)[")]$/, "");
+                    return newlines + title;
+                }
+                return "";
+            });
+
+        return text;
+    };
+
+    commandProto.addLinkDef = function (chunk, linkDef) {
+
+        var refNumber = 0; // The current reference number
+        var defsToAdd = {}; //
+        // Start with a clean slate by removing all previous link definitions.
+        chunk.before = this.stripLinkDefs(chunk.before, defsToAdd);
+        chunk.selection = this.stripLinkDefs(chunk.selection, defsToAdd);
+        chunk.after = this.stripLinkDefs(chunk.after, defsToAdd);
+
+        var defs = "";
+        var regex = /(\[)((?:\[[^\]]*\]|[^\[\]])*)(\][ ]?(?:\n[ ]*)?\[)(\d+)(\])/g;
+
+        var addDefNumber = function (def) {
+            refNumber++;
+            def = def.replace(/^[ ]{0,3}\[(\d+)\]:/, "  [" + refNumber + "]:");
+            defs += "\n" + def;
+        };
+
+        // note that
+        // a) the recursive call to getLink cannot go infinite, because by definition
+        //    of regex, inner is always a proper substring of wholeMatch, and
+        // b) more than one level of nesting is neither supported by the regex
+        //    nor making a lot of sense (the only use case for nesting is a linked image)
+        var getLink = function (wholeMatch, before, inner, afterInner, id, end) {
+            inner = inner.replace(regex, getLink);
+            if (defsToAdd[id]) {
+                addDefNumber(defsToAdd[id]);
+                return before + inner + afterInner + refNumber + end;
+            }
+            return wholeMatch;
+        };
+
+        chunk.before = chunk.before.replace(regex, getLink);
+
+        if (linkDef) {
+            addDefNumber(linkDef);
+        }
+        else {
+            chunk.selection = chunk.selection.replace(regex, getLink);
+        }
+
+        var refOut = refNumber;
+
+        chunk.after = chunk.after.replace(regex, getLink);
+
+        if (chunk.after) {
+            chunk.after = chunk.after.replace(/\n*$/, "");
+        }
+        if (!chunk.after) {
+            chunk.selection = chunk.selection.replace(/\n*$/, "");
+        }
+
+        chunk.after += "\n\n" + defs;
+
+        return refOut;
+    };
+
+    // takes the line as entered into the add link/as image dialog and makes
+    // sure the URL and the optinal title are "nice".
+    function properlyEncoded(linkdef) {
+        return linkdef.replace(/^\s*(.*?)(?:\s+"(.+)")?\s*$/, function (wholematch, link, title) {
+            link = link.replace(/\?.*$/, function (querypart) {
+                return querypart.replace(/\+/g, " "); // in the query string, a plus and a space are identical
+            });
+            link = decodeURIComponent(link); // unencode first, to prevent double encoding
+            link = encodeURI(link).replace(/'/g, '%27').replace(/\(/g, '%28').replace(/\)/g, '%29');
+            link = link.replace(/\?.*$/, function (querypart) {
+                return querypart.replace(/\+/g, "%2b"); // since we replaced plus with spaces in the query part, all pluses that now appear where originally encoded
+            });
+            if (title) {
+                title = title.trim ? title.trim() : title.replace(/^\s*/, "").replace(/\s*$/, "");
+                title = title.replace(/"/g, "quot;").replace(/\(/g, "&#40;").replace(/\)/g, "&#41;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
+            }
+            return title ? link + ' "' + title + '"' : link;
+        });
+    }
+
+    commandProto.doLinkOrImage = function (chunk, postProcessing, isImage) {
+
+        chunk.trimWhitespace();
+        chunk.findTags(/\s*!?\[/, /\][ ]?(?:\n[ ]*)?(\[.*?\])?/);
+        var background;
+
+        if (chunk.endTag.length > 1 && chunk.startTag.length > 0) {
+
+            chunk.startTag = chunk.startTag.replace(/!?\[/, "");
+            chunk.endTag = "";
+            this.addLinkDef(chunk, null);
+
+        }
+        else {
+
+            // We're moving start and end tag back into the selection, since (as we're in the else block) we're not
+            // *removing* a link, but *adding* one, so whatever findTags() found is now back to being part of the
+            // link text. linkEnteredCallback takes care of escaping any brackets.
+            chunk.selection = chunk.startTag + chunk.selection + chunk.endTag;
+            chunk.startTag = chunk.endTag = "";
+
+            if (/\n\n/.test(chunk.selection)) {
+                this.addLinkDef(chunk, null);
+                return;
+            }
+            var that = this;
+            // The function to be executed when you enter a link and press OK or Cancel.
+            // Marks up the link and adds the ref.
+            var linkEnteredCallback = function (link) {
+
+                background.parentNode.removeChild(background);
+
+                if (link !== null) {
+                    // (                          $1
+                    //     [^\\]                  anything that's not a backslash
+                    //     (?:\\\\)*              an even number (this includes zero) of backslashes
+                    // )
+                    // (?=                        followed by
+                    //     [[\]]                  an opening or closing bracket
+                    // )
+                    //
+                    // In other words, a non-escaped bracket. These have to be escaped now to make sure they
+                    // don't count as the end of the link or similar.
+                    // Note that the actual bracket has to be a lookahead, because (in case of to subsequent brackets),
+                    // the bracket in one match may be the "not a backslash" character in the next match, so it
+                    // should not be consumed by the first match.
+                    // The "prepend a space and finally remove it" steps makes sure there is a "not a backslash" at the
+                    // start of the string, so this also works if the selection begins with a bracket. We cannot solve
+                    // this by anchoring with ^, because in the case that the selection starts with two brackets, this
+                    // would mean a zero-width match at the start. Since zero-width matches advance the string position,
+                    // the first bracket could then not act as the "not a backslash" for the second.
+                    chunk.selection = (" " + chunk.selection).replace(/([^\\](?:\\\\)*)(?=[[\]])/g, "$1\\").substr(1);
+
+                    var linkDef = " [999]: " + properlyEncoded(link);
+
+                    var num = that.addLinkDef(chunk, linkDef);
+                    chunk.startTag = isImage ? "![" : "[";
+                    chunk.endTag = "][" + num + "]";
+
+                    if (!chunk.selection) {
+                        if (isImage) {
+                            var imagename = that.getString("imagename");
+                            if (!!imagename) {
+                                imagename = imagename.replace(/_/g, '\\_');
+                            }
+
+                            chunk.selection = imagename || that.getString("imagedescription");
+                        }
+                        else {
+                            var linkname = that.getString("linkname");
+                            if (!!linkname) {
+                                linkname = linkname.replace(/_/g, '\\_');
+                            }
+
+                            chunk.selection = linkname || that.getString("linkdescription");
+                        }
+                    }
+                }
+                postProcessing();
+            };
+
+            background = ui.createBackground();
+
+            if (isImage) {
+                if (!this.hooks.insertImageDialog(linkEnteredCallback))
+                    ui.prompt(this.getString("imagedialog"), imageDefaultText, linkEnteredCallback, this.getString("ok"), this.getString("cancel"));
+            }
+            else {
+                if (!this.hooks.insertLinkDialog(linkEnteredCallback))
+                    ui.prompt(this.getString("linkdialog"), linkDefaultText, linkEnteredCallback, this.getString("ok"), this.getString("cancel"));
+            }
+            return true;
+        }
+    };
+
+    // When making a list, hitting shift-enter will put your cursor on the next line
+    // at the current indent level.
+    commandProto.doAutoindent = function (chunk, postProcessing) {
+
+        var commandMgr = this,
+            fakeSelection = false;
+
+        chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}([*+-]|\d+[.])[ \t]*\n$/, "\n\n");
+        chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}>[ \t]*\n$/, "\n\n");
+        chunk.before = chunk.before.replace(/(\n|^)[ \t]+\n$/, "\n\n");
+
+        // There's no selection, end the cursor wasn't at the end of the line:
+        // The user wants to split the current list item / code line / blockquote line
+        // (for the latter it doesn't really matter) in two. Temporarily select the
+        // (rest of the) line to achieve this.
+        if (!chunk.selection && !/^[ \t]*(?:\n|$)/.test(chunk.after)) {
+            chunk.after = chunk.after.replace(/^[^\n]*/, function (wholeMatch) {
+                chunk.selection = wholeMatch;
+                return "";
+            });
+            fakeSelection = true;
+        }
+
+        if (/(\n|^)[ ]{0,3}([*+-]|\d+[.])[ \t]+.*\n$/.test(chunk.before)) {
+            if (commandMgr.doList) {
+                commandMgr.doList(chunk);
+            }
+        }
+        if (/(\n|^)[ ]{0,3}>[ \t]+.*\n$/.test(chunk.before)) {
+            if (commandMgr.doBlockquote) {
+                commandMgr.doBlockquote(chunk);
+            }
+        }
+        if (/(\n|^)(\t|[ ]{4,}).*\n$/.test(chunk.before)) {
+            if (commandMgr.doCode) {
+                commandMgr.doCode(chunk);
+            }
+        }
+
+        if (fakeSelection) {
+            chunk.after = chunk.selection + chunk.after;
+            chunk.selection = "";
+        }
+    };
+
+    commandProto.doBlockquote = function (chunk, postProcessing) {
+
+        chunk.selection = chunk.selection.replace(/^(\n*)([^\r]+?)(\n*)$/,
+            function (totalMatch, newlinesBefore, text, newlinesAfter) {
+                chunk.before += newlinesBefore;
+                chunk.after = newlinesAfter + chunk.after;
+                return text;
+            });
+
+        chunk.before = chunk.before.replace(/(>[ \t]*)$/,
+            function (totalMatch, blankLine) {
+                chunk.selection = blankLine + chunk.selection;
+                return "";
+            });
+
+        chunk.selection = chunk.selection.replace(/^(\s|>)+$/, "");
+        chunk.selection = chunk.selection || this.getString("quoteexample");
+
+        // The original code uses a regular expression to find out how much of the
+        // text *directly before* the selection already was a blockquote:
+
+        /*
+        if (chunk.before) {
+        chunk.before = chunk.before.replace(/\n?$/, "\n");
+        }
+        chunk.before = chunk.before.replace(/(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*$)/,
+        function (totalMatch) {
+        chunk.startTag = totalMatch;
+        return "";
+        });
+        */
+
+        // This comes down to:
+        // Go backwards as many lines a possible, such that each line
+        //  a) starts with ">", or
+        //  b) is almost empty, except for whitespace, or
+        //  c) is preceeded by an unbroken chain of non-empty lines
+        //     leading up to a line that starts with ">" and at least one more character
+        // and in addition
+        //  d) at least one line fulfills a)
+        //
+        // Since this is essentially a backwards-moving regex, it's susceptible to
+        // catstrophic backtracking and can cause the browser to hang;
+        // see e.g. http://meta.stackoverflow.com/questions/9807.
+        //
+        // Hence we replaced this by a simple state machine that just goes through the
+        // lines and checks for a), b), and c).
+
+        var match = "",
+            leftOver = "",
+            line;
+        if (chunk.before) {
+            var lines = chunk.before.replace(/\n$/, "").split("\n");
+            var inChain = false;
+            for (var i = 0; i < lines.length; i++) {
+                var good = false;
+                line = lines[i];
+                inChain = inChain && line.length > 0; // c) any non-empty line continues the chain
+                if (/^>/.test(line)) {                // a)
+                    good = true;
+                    if (!inChain && line.length > 1)  // c) any line that starts with ">" and has at least one more character starts the chain
+                        inChain = true;
+                } else if (/^[ \t]*$/.test(line)) {   // b)
+                    good = true;
+                } else {
+                    good = inChain;                   // c) the line is not empty and does not start with ">", so it matches if and only if we're in the chain
+                }
+                if (good) {
+                    match += line + "\n";
+                } else {
+                    leftOver += match + line;
+                    match = "\n";
+                }
+            }
+            if (!/(^|\n)>/.test(match)) {             // d)
+                leftOver += match;
+                match = "";
+            }
+        }
+
+        chunk.startTag = match;
+        chunk.before = leftOver;
+
+        // end of change
+
+        if (chunk.after) {
+            chunk.after = chunk.after.replace(/^\n?/, "\n");
+        }
+
+        chunk.after = chunk.after.replace(/^(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*)/,
+            function (totalMatch) {
+                chunk.endTag = totalMatch;
+                return "";
+            }
+        );
+
+        var replaceBlanksInTags = function (useBracket) {
+
+            var replacement = useBracket ? "> " : "";
+
+            if (chunk.startTag) {
+                chunk.startTag = chunk.startTag.replace(/\n((>|\s)*)\n$/,
+                    function (totalMatch, markdown) {
+                        return "\n" + markdown.replace(/^[ ]{0,3}>?[ \t]*$/gm, replacement) + "\n";
+                    });
+            }
+            if (chunk.endTag) {
+                chunk.endTag = chunk.endTag.replace(/^\n((>|\s)*)\n/,
+                    function (totalMatch, markdown) {
+                        return "\n" + markdown.replace(/^[ ]{0,3}>?[ \t]*$/gm, replacement) + "\n";
+                    });
+            }
+        };
+
+        if (/^(?![ ]{0,3}>)/m.test(chunk.selection)) {
+            this.wrap(chunk, SETTINGS.lineLength - 2);
+            chunk.selection = chunk.selection.replace(/^/gm, "> ");
+            replaceBlanksInTags(true);
+            chunk.skipLines();
+        } else {
+            chunk.selection = chunk.selection.replace(/^[ ]{0,3}> ?/gm, "");
+            this.unwrap(chunk);
+            replaceBlanksInTags(false);
+
+            if (!/^(\n|^)[ ]{0,3}>/.test(chunk.selection) && chunk.startTag) {
+                chunk.startTag = chunk.startTag.replace(/\n{0,2}$/, "\n\n");
+            }
+
+            if (!/(\n|^)[ ]{0,3}>.*$/.test(chunk.selection) && chunk.endTag) {
+                chunk.endTag = chunk.endTag.replace(/^\n{0,2}/, "\n\n");
+            }
+        }
+
+        chunk.selection = this.hooks.postBlockquoteCreation(chunk.selection);
+
+        if (!/\n/.test(chunk.selection)) {
+            chunk.selection = chunk.selection.replace(/^(> *)/,
+            function (wholeMatch, blanks) {
+                chunk.startTag += blanks;
+                return "";
+            });
+        }
+    };
+
+    commandProto.doCode = function (chunk, postProcessing) {
+
+        var hasTextBefore = /\S[ ]*$/.test(chunk.before);
+        var hasTextAfter = /^[ ]*\S/.test(chunk.after);
+
+        // Use 'four space' markdown if the selection is on its own
+        // line or is multiline.
+        if ((!hasTextAfter && !hasTextBefore) || /\n/.test(chunk.selection)) {
+
+            chunk.before = chunk.before.replace(/[ ]{4}$/,
+                function (totalMatch) {
+                    chunk.selection = totalMatch + chunk.selection;
+                    return "";
+                });
+
+            var nLinesBack = 1;
+            var nLinesForward = 1;
+
+            if (/(\n|^)(\t|[ ]{4,}).*\n$/.test(chunk.before)) {
+                nLinesBack = 0;
+            }
+            if (/^\n(\t|[ ]{4,})/.test(chunk.after)) {
+                nLinesForward = 0;
+            }
+
+            chunk.skipLines(nLinesBack, nLinesForward);
+
+            if (!chunk.selection) {
+                chunk.startTag = "    ";
+                chunk.selection = this.getString("codeexample");
+            }
+            else {
+                if (/^[ ]{0,3}\S/m.test(chunk.selection)) {
+                    if (/\n/.test(chunk.selection))
+                        chunk.selection = chunk.selection.replace(/^/gm, "    ");
+                    else // if it's not multiline, do not select the four added spaces; this is more consistent with the doList behavior
+                        chunk.before += "    ";
+                }
+                else {
+                    chunk.selection = chunk.selection.replace(/^(?:[ ]{4}|[ ]{0,3}\t)/gm, "");
+                }
+            }
+        }
+        else {
+            // Use backticks (`) to delimit the code block.
+
+            chunk.trimWhitespace();
+            chunk.findTags(/`/, /`/);
+
+            if (!chunk.startTag && !chunk.endTag) {
+                chunk.startTag = chunk.endTag = "`";
+                if (!chunk.selection) {
+                    chunk.selection = this.getString("codeexample");
+                }
+            }
+            else if (chunk.endTag && !chunk.startTag) {
+                chunk.before += chunk.endTag;
+                chunk.endTag = "";
+            }
+            else {
+                chunk.startTag = chunk.endTag = "";
+            }
+        }
+    };
+
+    commandProto.doList = function (chunk, postProcessing, isNumberedList) {
+
+        // These are identical except at the very beginning and end.
+        // Should probably use the regex extension function to make this clearer.
+        var previousItemsRegex = /(\n|^)(([ ]{0,3}([*+-]|\d+[.])[ \t]+.*)(\n.+|\n{2,}([*+-].*|\d+[.])[ \t]+.*|\n{2,}[ \t]+\S.*)*)\n*$/;
+        var nextItemsRegex = /^\n*(([ ]{0,3}([*+-]|\d+[.])[ \t]+.*)(\n.+|\n{2,}([*+-].*|\d+[.])[ \t]+.*|\n{2,}[ \t]+\S.*)*)\n*/;
+
+        // The default bullet is a dash but others are possible.
+        // This has nothing to do with the particular HTML bullet,
+        // it's just a markdown bullet.
+        var bullet = "-";
+
+        // The number in a numbered list.
+        var num = 1;
+
+        // Get the item prefix - e.g. " 1. " for a numbered list, " - " for a bulleted list.
+        var getItemPrefix = function () {
+            var prefix;
+            if (isNumberedList) {
+                prefix = " " + num + ". ";
+                num++;
+            }
+            else {
+                prefix = " " + bullet + " ";
+            }
+            return prefix;
+        };
+
+        // Fixes the prefixes of the other list items.
+        var getPrefixedItem = function (itemText) {
+
+            // The numbering flag is unset when called by autoindent.
+            if (isNumberedList === undefined) {
+                isNumberedList = /^\s*\d/.test(itemText);
+            }
+
+            // Renumber/bullet the list element.
+            itemText = itemText.replace(/^[ ]{0,3}([*+-]|\d+[.])\s/gm,
+                function (_) {
+                    return getItemPrefix();
+                });
+
+            return itemText;
+        };
+
+        chunk.findTags(/(\n|^)*[ ]{0,3}([*+-]|\d+[.])\s+/, null);
+
+        if (chunk.before && !/\n$/.test(chunk.before) && !/^\n/.test(chunk.startTag)) {
+            chunk.before += chunk.startTag;
+            chunk.startTag = "";
+        }
+
+        if (chunk.startTag) {
+
+            var hasDigits = /\d+[.]/.test(chunk.startTag);
+            chunk.startTag = "";
+            chunk.selection = chunk.selection.replace(/\n[ ]{4}/g, "\n");
+            this.unwrap(chunk);
+            chunk.skipLines();
+
+            if (hasDigits) {
+                // Have to renumber the bullet points if this is a numbered list.
+                chunk.after = chunk.after.replace(nextItemsRegex, getPrefixedItem);
+            }
+            if (isNumberedList == hasDigits) {
+                return;
+            }
+        }
+
+        var nLinesUp = 1;
+
+        chunk.before = chunk.before.replace(previousItemsRegex,
+            function (itemText) {
+                if (/^\s*([*+-])/.test(itemText)) {
+                    bullet = re.$1;
+                }
+                nLinesUp = /[^\n]\n\n[^\n]/.test(itemText) ? 1 : 0;
+                return getPrefixedItem(itemText);
+            });
+
+        if (!chunk.selection) {
+            chunk.selection = this.getString("litem");
+        }
+
+        var prefix = getItemPrefix();
+
+        var nLinesDown = 1;
+
+        chunk.after = chunk.after.replace(nextItemsRegex,
+            function (itemText) {
+                nLinesDown = /[^\n]\n\n[^\n]/.test(itemText) ? 1 : 0;
+                return getPrefixedItem(itemText);
+            });
+
+        chunk.trimWhitespace(true);
+        chunk.skipLines(nLinesUp, nLinesDown, true);
+        chunk.startTag = prefix;
+        var spaces = prefix.replace(/./g, " ");
+        this.wrap(chunk, SETTINGS.lineLength - spaces.length);
+        chunk.selection = chunk.selection.replace(/\n/g, "\n" + spaces);
+
+    };
+
+    commandProto.doHeading = function (chunk, postProcessing) {
+
+        // Remove leading/trailing whitespace and reduce internal spaces to single spaces.
+        chunk.selection = chunk.selection.replace(/\s+/g, " ");
+        chunk.selection = chunk.selection.replace(/(^\s+|\s+$)/g, "");
+
+        // If we clicked the button with no selected text, we just
+        // make a level 2 hash header around some default text.
+        if (!chunk.selection) {
+            chunk.startTag = "## ";
+            chunk.selection = this.getString("headingexample");
+            chunk.endTag = " ##";
+            return;
+        }
+
+        var headerLevel = 0;     // The existing header level of the selected text.
+
+        // Remove any existing hash heading markdown and save the header level.
+        chunk.findTags(/#+[ ]*/, /[ ]*#+/);
+        if (/#+/.test(chunk.startTag)) {
+            headerLevel = re.lastMatch.length;
+        }
+        chunk.startTag = chunk.endTag = "";
+
+        // Try to get the current header level by looking for - and = in the line
+        // below the selection.
+        chunk.findTags(null, /\s?(-+|=+)/);
+        if (/=+/.test(chunk.endTag)) {
+            headerLevel = 1;
+        }
+        if (/-+/.test(chunk.endTag)) {
+            headerLevel = 2;
+        }
+
+        // Skip to the next line so we can create the header markdown.
+        chunk.startTag = chunk.endTag = "";
+        chunk.skipLines(1, 1);
+
+        // We make a level 2 header if there is no current header.
+        // If there is a header level, we substract one from the header level.
+        // If it's already a level 1 header, it's removed.
+        var headerLevelToCreate = headerLevel == 0 ? 2 : headerLevel - 1;
+
+        if (headerLevelToCreate > 0) {
+
+            // The button only creates level 1 and 2 underline headers.
+            // Why not have it iterate over hash header levels?  Wouldn't that be easier and cleaner?
+            var headerChar = headerLevelToCreate >= 2 ? "-" : "=";
+            var len = chunk.selection.length;
+            if (len > SETTINGS.lineLength) {
+                len = SETTINGS.lineLength;
+            }
+            chunk.endTag = "\n";
+            while (len--) {
+                chunk.endTag += headerChar;
+            }
+        }
+    };
+
+    commandProto.doHorizontalRule = function (chunk, postProcessing) {
+        chunk.startTag = "----------\n";
+        chunk.selection = "";
+        chunk.skipLines(2, 1, true);
+    }
+
+    commandProto.doMore = function (chunk, postProcessing) {
+        chunk.startTag = "<!--more-->\n\n";
+        chunk.selection = "";
+        chunk.skipLines(2, 0, true);
+    }
+
+    commandProto.doTab = function (chunk, postProcessing) {
+        chunk.startTag = "    ";
+        chunk.selection = "";
+    }
+
+    function FullScreenManager (hooks, getString) {
+        this.fullScreenBind = false;
+        this.hooks = hooks;
+        this.getString = getString;
+        this.isFakeFullScreen = false;
+    }
+
+    function getFullScreenAdapter () {
+        var selector = {
+            fullScreenChange : ['onfullscreenchange', 'onwebkitfullscreenchange', 'onmozfullscreenchange', 'onmsfullscreenchange'],
+            requestFullscreen : ['requestFullscreen', 'webkitRequestFullScreen', 'mozRequestFullScreen', 'msRequestFullScreen'],
+            cancelFullscreen : ['cancelFullscreen', 'exitFullScreen', 'webkitCancelFullScreen', 'mozCancelFullScreen', 'msCancelFullScreen']
+        }, adapter = {};
+
+        for (var name in selector) {
+            var len = selector[name].length, found = false;
+
+            for (var i = 0; i < len; i ++) {
+                var method = selector[name][i];
+
+                if ('undefined' != typeof(document[method]) || 'undefined' != typeof(document.body[method])) {
+                    adapter[name] = method;
+                    found = true;
+                    break;
+                }
+            }
+
+            if (!found) {
+                return false;
+            }
+        }
+
+        return adapter;
+    };
+
+    function isFullScreen () {
+        return document.fullScreen || 
+            document.mozFullScreen || 
+            document.webkitIsFullScreen ||
+            document.msIsFullScreen;
+    };
+
+    // fullscreen
+    FullScreenManager.prototype.doFullScreen = function (buttons, enter) {
+        var adapter = getFullScreenAdapter(), self = this;
+
+        if (!adapter) {
+            alert(self.getString('fullscreenUnsupport'));
+            return false;
+        }
+
+        if (!this.fullScreenBind) {
+            util.addEvent(document, adapter.fullScreenChange.substring(2), function () {
+                if (!isFullScreen()) {
+                    buttons.fullscreen.style.display = '';
+                    buttons.exitFullscreen.style.display = 'none';
+                    self.hooks.exitFullScreen();
+                } else {
+                    buttons.fullscreen.style.display = 'none';
+                    buttons.exitFullscreen.style.display = '';
+                    self.hooks.enterFullScreen();
+                }
+            });
+
+            this.fullScreenBind = true;
+        }
+
+        if (enter) {
+            if (self.isFakeFullScreen) {
+                document.body[adapter.requestFullscreen]('webkitRequestFullScreen' == adapter.requestFullscreen 
+                    ? Element.ALLOW_KEYBOARD_INPUT : null);
+                self.isFakeFullScreen = false;
+            } else if (!isFullScreen()) {
+                buttons.exitFullscreen.style.display = '';
+                self.hooks.enterFakeFullScreen();
+                self.isFakeFullScreen = true;
+            }
+        } else {
+            if (self.isFakeFullScreen) {
+                buttons.exitFullscreen.style.display = 'none';
+                self.hooks.exitFullScreen();
+            } else if (isFullScreen()) {
+                document[adapter.cancelFullscreen]();
+            }
+            
+            self.isFakeFullScreen = false;
+        }
+    };
+})();
diff --git a/usr/themes/default/header.php b/usr/themes/default/header.php
index 04ee1bb6..4829779d 100644
--- a/usr/themes/default/header.php
+++ b/usr/themes/default/header.php
@@ -1,63 +1,68 @@
-<!DOCTYPE HTML>
-<!--[if lt IE 7]>      <html class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]-->
-<!--[if IE 7]>         <html class="no-js lt-ie9 lt-ie8"> <![endif]-->
-<!--[if IE 8]>         <html class="no-js lt-ie9"> <![endif]-->
-<!--[if gt IE 8]><!--> <html class="no-js"> <!--<![endif]-->
-<head>
-    <meta charset="<?php $this->options->charset(); ?>">
-    <meta http-equiv="X-UA-Compatible" content="IE=edge, chrome=1">
-    <meta name="renderer" content="webkit">
-    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
-    <title><?php $this->archiveTitle(' &raquo; ', '', ' - '); ?><?php $this->options->title(); ?></title>
-
-    <!-- 使用url函数转换相关路径 -->
-    <link rel="stylesheet" href="<?php $this->options->adminUrl('css/normalize.css'); ?>">
-    <link rel="stylesheet" href="<?php $this->options->adminUrl('css/grid.css'); ?>">
-    <link rel="stylesheet" href="<?php $this->options->themeUrl('style.css'); ?>">
-
-    <!--[if lt IE 9]>
-    <script src="<?php $this->options->adminUrl('js/html5shiv.js'); ?>"></script>
-    <script src="<?php $this->options->adminUrl('js/respond.js'); ?>"></script>
-    <![endif]-->
-
-    <!-- 通过自有函数输出HTML头部信息 -->
-    <?php $this->header(); ?>
-</head>
-<body>
-
-<header id="header" class="clearfix">
-    <div class="container">
-        <div class="colgroup">
-            <div class="site-name col-mb-12 col-9">
-                <a id="logo" href="<?php $this->options->siteUrl(); ?>">
-                    <?php if ($this->options->logoUrl): ?>
-                    <img src="<?php $this->options->logoUrl() ?>" alt="<?php $this->options->title() ?>" />
-                    <?php endif; ?>
-                    <?php $this->options->title() ?>
-                </a>
-        	    <p class="description"><?php $this->options->description() ?></p>
-            </div>
-            <div class="site-search col-3 kit-hidden-tb">
-                <form id="search" method="post" action="./">
-                    <input type="text" name="s" class="text" placeholder="<?php _e('输入关键字搜索'); ?>" />
-                    <button type="submit" class="submit"><?php _e('搜索'); ?></button>
-                </form>
-            </div>
-            <div class="col-mb-12">
-                <nav id="nav-menu" class="clearfix">
-                    <a<?php if($this->is('index')): ?> class="current"<?php endif; ?> href="<?php $this->options->siteUrl(); ?>"><?php _e('首页'); ?></a>
-                    <?php $this->widget('Widget_Contents_Page_List')->to($pages); ?>
-                    <?php while($pages->next()): ?>
-                    <a<?php if($this->is('page', $pages->slug)): ?> class="current"<?php endif; ?> href="<?php $pages->permalink(); ?>" title="<?php $pages->title(); ?>"><?php $pages->title(); ?></a>
-                    <?php endwhile; ?>
-                </nav>
-            </div>
-        </div><!-- end .colgroup -->
-    </div>
-</header><!-- end #header -->
-<div id="body">
-    <div class="container">
-        <div class="colgroup">
-
-    
-    
+<!DOCTYPE HTML>
+<!--[if lt IE 7]>      <html class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]-->
+<!--[if IE 7]>         <html class="no-js lt-ie9 lt-ie8"> <![endif]-->
+<!--[if IE 8]>         <html class="no-js lt-ie9"> <![endif]-->
+<!--[if gt IE 8]><!--> <html class="no-js"> <!--<![endif]-->
+<head>
+    <meta charset="<?php $this->options->charset(); ?>">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge, chrome=1">
+    <meta name="renderer" content="webkit">
+    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
+    <title><?php $this->archiveTitle(array(
+            'category'  =>  _t('分类 %s 下的文章'),
+            'search'    =>  _t('包含关键字 %s 的文章'),
+            'tag'       =>  _t('标签 %s 下的文章'),
+            'author'    =>  _t('%s 发布的文章')
+        ), '', ' - '); ?><?php $this->options->title(); ?></title>
+
+    <!-- 使用url函数转换相关路径 -->
+    <link rel="stylesheet" href="<?php $this->options->adminUrl('css/normalize.css'); ?>">
+    <link rel="stylesheet" href="<?php $this->options->adminUrl('css/grid.css'); ?>">
+    <link rel="stylesheet" href="<?php $this->options->themeUrl('style.css'); ?>">
+
+    <!--[if lt IE 9]>
+    <script src="<?php $this->options->adminUrl('js/html5shiv.js'); ?>"></script>
+    <script src="<?php $this->options->adminUrl('js/respond.js'); ?>"></script>
+    <![endif]-->
+
+    <!-- 通过自有函数输出HTML头部信息 -->
+    <?php $this->header(); ?>
+</head>
+<body>
+
+<header id="header" class="clearfix">
+    <div class="container">
+        <div class="colgroup">
+            <div class="site-name col-mb-12 col-9">
+                <a id="logo" href="<?php $this->options->siteUrl(); ?>">
+                    <?php if ($this->options->logoUrl): ?>
+                    <img src="<?php $this->options->logoUrl() ?>" alt="<?php $this->options->title() ?>" />
+                    <?php endif; ?>
+                    <?php $this->options->title() ?>
+                </a>
+        	    <p class="description"><?php $this->options->description() ?></p>
+            </div>
+            <div class="site-search col-3 kit-hidden-tb">
+                <form id="search" method="post" action="./">
+                    <input type="text" name="s" class="text" placeholder="<?php _e('输入关键字搜索'); ?>" />
+                    <button type="submit" class="submit"><?php _e('搜索'); ?></button>
+                </form>
+            </div>
+            <div class="col-mb-12">
+                <nav id="nav-menu" class="clearfix">
+                    <a<?php if($this->is('index')): ?> class="current"<?php endif; ?> href="<?php $this->options->siteUrl(); ?>"><?php _e('首页'); ?></a>
+                    <?php $this->widget('Widget_Contents_Page_List')->to($pages); ?>
+                    <?php while($pages->next()): ?>
+                    <a<?php if($this->is('page', $pages->slug)): ?> class="current"<?php endif; ?> href="<?php $pages->permalink(); ?>" title="<?php $pages->title(); ?>"><?php $pages->title(); ?></a>
+                    <?php endwhile; ?>
+                </nav>
+            </div>
+        </div><!-- end .colgroup -->
+    </div>
+</header><!-- end #header -->
+<div id="body">
+    <div class="container">
+        <div class="colgroup">
+
+    
+    
diff --git a/var/Markdown.php b/var/Markdown.php
deleted file mode 100644
index f4043d96..00000000
--- a/var/Markdown.php
+++ /dev/null
@@ -1,1631 +0,0 @@
-<?php
-#
-# Markdown  -  A text-to-HTML conversion tool for web writers
-#
-# PHP Markdown  
-# Copyright (c) 2004-2013 Michel Fortin  
-# <http://michelf.com/projects/php-markdown/>
-#
-# Original Markdown  
-# Copyright (c) 2004-2006 John Gruber  
-# <http://daringfireball.net/projects/markdown/>
-#
-
-#
-# The following two constants are deprecated: avoid using them, they'll
-# disappear when the Lib branch becomes the only one to be updated.
-#
-# You can get the parser's version using the constant inside of the parser
-# class: \Michelf\Markdown::MARKDOWNLIB_VERSION.
-#
-
-define('MARKDOWN_VERSION', "1.0.1p");  # Sun 13 Jan 2013
-define('MARKDOWNEXTRA_VERSION', "1.2.6");  # Sun 13 Jan 2013
-
-
-#
-# Markdown Parser Class
-#
-
-class Markdown {
-
-	### Version ###
-
-	const  MARKDOWNLIB_VERSION  =  "1.3-rc2";
-
-	### Simple Function Interface ###
-
-	public static function defaultTransform($text) {
-	#
-	# Initialize the parser and return the result of its transform method.
-	# This will work fine for derived classes too.
-	#
-		# Take parser class on which this function was called.
-		$parser_class = get_called_class();
-
-		# try to take parser from the static parser list
-		static $parser_list;
-		$parser =& $parser_list[$parser_class];
-
-		# create the parser it not already set
-		if (!$parser)
-			$parser = new $parser_class;
-
-		# Transform text using parser.
-		return $parser->transform($text);
-	}
-
-	### Configuration Variables ###
-
-	# Change to ">" for HTML output.
-	public $empty_element_suffix = " />";
-	public $tab_width = 4;
-	
-	# Change to `true` to disallow markup or entities.
-	public $no_markup = false;
-	public $no_entities = false;
-	
-	# Predefined urls and titles for reference links and images.
-	public $predef_urls = array();
-	public $predef_titles = array();
-
-
-	### Parser Implementation ###
-
-	# Regex to match balanced [brackets].
-	# Needed to insert a maximum bracked depth while converting to PHP.
-	protected $nested_brackets_depth = 6;
-	protected $nested_brackets_re;
-	
-	protected $nested_url_parenthesis_depth = 4;
-	protected $nested_url_parenthesis_re;
-
-	# Table of hash values for escaped characters:
-	protected $escape_chars = '\`*_{}[]()>#+-.!';
-	protected $escape_chars_re;
-
-
-	public function __construct() {
-	#
-	# Constructor function. Initialize appropriate member variables.
-	#
-		$this->_initDetab();
-		$this->prepareItalicsAndBold();
-	
-		$this->nested_brackets_re = 
-			str_repeat('(?>[^\[\]]+|\[', $this->nested_brackets_depth).
-			str_repeat('\])*', $this->nested_brackets_depth);
-	
-		$this->nested_url_parenthesis_re = 
-			str_repeat('(?>[^()\s]+|\(', $this->nested_url_parenthesis_depth).
-			str_repeat('(?>\)))*', $this->nested_url_parenthesis_depth);
-		
-		$this->escape_chars_re = '['.preg_quote($this->escape_chars).']';
-		
-		# Sort document, block, and span gamut in ascendent priority order.
-		asort($this->document_gamut);
-		asort($this->block_gamut);
-		asort($this->span_gamut);
-	}
-
-
-	# Internal hashes used during transformation.
-	protected $urls = array();
-	protected $titles = array();
-	protected $html_hashes = array();
-	
-	# Status flag to avoid invalid nesting.
-	protected $in_anchor = false;
-	
-	
-	protected function setup() {
-	#
-	# Called before the transformation process starts to setup parser 
-	# states.
-	#
-		# Clear global hashes.
-		$this->urls = $this->predef_urls;
-		$this->titles = $this->predef_titles;
-		$this->html_hashes = array();
-		
-		$this->in_anchor = false;
-	}
-	
-	protected function teardown() {
-	#
-	# Called after the transformation process to clear any variable 
-	# which may be taking up memory unnecessarly.
-	#
-		$this->urls = array();
-		$this->titles = array();
-		$this->html_hashes = array();
-	}
-
-
-	public function transform($text) {
-	#
-	# Main function. Performs some preprocessing on the input text
-	# and pass it through the document gamut.
-	#
-		$this->setup();
-	
-		# Remove UTF-8 BOM and marker character in input, if present.
-		$text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text);
-
-		# Standardize line endings:
-		#   DOS to Unix and Mac to Unix
-		$text = preg_replace('{\r\n?}', "\n", $text);
-
-		# Make sure $text ends with a couple of newlines:
-		$text .= "\n\n";
-
-		# Convert all tabs to spaces.
-		$text = $this->detab($text);
-
-		# Turn block-level HTML blocks into hash entries
-		$text = $this->hashHTMLBlocks($text);
-
-		# Strip any lines consisting only of spaces and tabs.
-		# This makes subsequent regexen easier to write, because we can
-		# match consecutive blank lines with /\n+/ instead of something
-		# contorted like /[ ]*\n+/ .
-		$text = preg_replace('/^[ ]+$/m', '', $text);
-
-		# Run document gamut methods.
-		foreach ($this->document_gamut as $method => $priority) {
-			$text = $this->$method($text);
-		}
-		
-		$this->teardown();
-
-        $text = preg_replace_callback("/<\/?(\!doctype|html|head|body|link|title|input|select|button|textarea|style|noscript)[^>]*>/is", 
-            array(&$this, '_transform_callback'), $text);
-
-		return $text . "\n";
-	}
-
-    /**
-     * _transform_callback 
-     * 
-     * @param array $matches 
-     * @access protected
-     * @return string
-     */
-    protected function _transform_callback($matches) {
-        return htmlspecialchars($matches[0]);
-    }
-	
-	protected $document_gamut = array(
-		# Strip link definitions, store in hashes.
-		"stripLinkDefinitions" => 20,
-		
-		"runBasicBlockGamut"   => 30,
-		);
-
-
-	protected function stripLinkDefinitions($text) {
-	#
-	# Strips link definitions from text, stores the URLs and titles in
-	# hash references.
-	#
-		$less_than_tab = $this->tab_width - 1;
-
-		# Link defs are in the form: ^[id]: url "optional title"
-		$text = preg_replace_callback('{
-							^[ ]{0,'.$less_than_tab.'}\[(.+)\][ ]?:	# id = $1
-							  [ ]*
-							  \n?				# maybe *one* newline
-							  [ ]*
-							(?:
-							  <(.+?)>			# url = $2
-							|
-							  (\S+?)			# url = $3
-							)
-							  [ ]*
-							  \n?				# maybe one newline
-							  [ ]*
-							(?:
-								(?<=\s)			# lookbehind for whitespace
-								["(]
-								(.*?)			# title = $4
-								[")]
-								[ ]*
-							)?	# title is optional
-							(?:\n+|\Z)
-			}xm',
-			array(&$this, '_stripLinkDefinitions_callback'),
-			$text);
-		return $text;
-	}
-	protected function _stripLinkDefinitions_callback($matches) {
-		$link_id = strtolower($matches[1]);
-		$url = $matches[2] == '' ? $matches[3] : $matches[2];
-		$this->urls[$link_id] = $url;
-		$this->titles[$link_id] =& $matches[4];
-		return ''; # String that will replace the block
-	}
-
-
-	protected function hashHTMLBlocks($text) {
-		if ($this->no_markup)  return $text;
-
-		$less_than_tab = $this->tab_width - 1;
-
-		# Hashify HTML blocks:
-		# We only want to do this for block-level HTML tags, such as headers,
-		# lists, and tables. That's because we still want to wrap <p>s around
-		# "paragraphs" that are wrapped in non-block-level tags, such as anchors,
-		# phrase emphasis, and spans. The list of tags we're looking for is
-		# hard-coded:
-		#
-		# *  List "a" is made of tags which can be both inline or block-level.
-		#    These will be treated block-level when the start tag is alone on 
-		#    its line, otherwise they're not matched here and will be taken as 
-		#    inline later.
-		# *  List "b" is made of tags which are always block-level;
-		#
-		$block_tags_a_re = 'ins|del';
-		$block_tags_b_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|'.
-						   'script|noscript|form|fieldset|iframe|math|svg|'.
-						   'article|section|nav|aside|hgroup|header|footer|'.
-						   'figure';
-
-		# Regular expression for the content of a block tag.
-		$nested_tags_level = 4;
-		$attr = '
-			(?>				# optional tag attributes
-			  \s			# starts with whitespace
-			  (?>
-				[^>"/]+		# text outside quotes
-			  |
-				/+(?!>)		# slash not followed by ">"
-			  |
-				"[^"]*"		# text inside double quotes (tolerate ">")
-			  |
-				\'[^\']*\'	# text inside single quotes (tolerate ">")
-			  )*
-			)?	
-			';
-		$content =
-			str_repeat('
-				(?>
-				  [^<]+			# content without tag
-				|
-				  <\2			# nested opening tag
-					'.$attr.'	# attributes
-					(?>
-					  />
-					|
-					  >', $nested_tags_level).	# end of opening tag
-					  '.*?'.					# last level nested tag content
-			str_repeat('
-					  </\2\s*>	# closing nested tag
-					)
-				  |				
-					<(?!/\2\s*>	# other tags with a different name
-				  )
-				)*',
-				$nested_tags_level);
-		$content2 = str_replace('\2', '\3', $content);
-
-		# First, look for nested blocks, e.g.:
-		# 	<div>
-		# 		<div>
-		# 		tags for inner block must be indented.
-		# 		</div>
-		# 	</div>
-		#
-		# The outermost tags must start at the left margin for this to match, and
-		# the inner nested divs must be indented.
-		# We need to do this before the next, more liberal match, because the next
-		# match will start at the first `<div>` and stop at the first `</div>`.
-		$text = preg_replace_callback('{(?>
-			(?>
-				(?<=\n\n)		# Starting after a blank line
-				|				# or
-				\A\n?			# the beginning of the doc
-			)
-			(						# save in $1
-
-			  # Match from `\n<tag>` to `</tag>\n`, handling nested tags 
-			  # in between.
-					
-						[ ]{0,'.$less_than_tab.'}
-						<('.$block_tags_b_re.')# start tag = $2
-						'.$attr.'>			# attributes followed by > and \n
-						'.$content.'		# content, support nesting
-						</\2>				# the matching end tag
-						[ ]*				# trailing spaces/tabs
-						(?=\n+|\Z)	# followed by a newline or end of document
-
-			| # Special version for tags of group a.
-
-						[ ]{0,'.$less_than_tab.'}
-						<('.$block_tags_a_re.')# start tag = $3
-						'.$attr.'>[ ]*\n	# attributes followed by >
-						'.$content2.'		# content, support nesting
-						</\3>				# the matching end tag
-						[ ]*				# trailing spaces/tabs
-						(?=\n+|\Z)	# followed by a newline or end of document
-					
-			| # Special case just for <hr />. It was easier to make a special 
-			  # case than to make the other regex more complicated.
-			
-						[ ]{0,'.$less_than_tab.'}
-						<(hr)				# start tag = $2
-						'.$attr.'			# attributes
-						/?>					# the matching end tag
-						[ ]*
-						(?=\n{2,}|\Z)		# followed by a blank line or end of document
-			
-			| # Special case for standalone HTML comments:
-			
-					[ ]{0,'.$less_than_tab.'}
-					(?s:
-						<!-- .*? -->
-					)
-					[ ]*
-					(?=\n{2,}|\Z)		# followed by a blank line or end of document
-			
-			| # PHP and ASP-style processor instructions (<? and <%)
-			
-					[ ]{0,'.$less_than_tab.'}
-					(?s:
-						<([?%])			# $2
-						.*?
-						\2>
-					)
-					[ ]*
-					(?=\n{2,}|\Z)		# followed by a blank line or end of document
-					
-			)
-			)}Sxmi',
-			array(&$this, '_hashHTMLBlocks_callback'),
-			$text);
-
-		return $text;
-	}
-	protected function _hashHTMLBlocks_callback($matches) {
-		$text = $matches[1];
-		$key  = $this->hashBlock($text);
-		return "\n\n$key\n\n";
-	}
-	
-	
-	protected function hashPart($text, $boundary = 'X') {
-	#
-	# Called whenever a tag must be hashed when a function insert an atomic 
-	# element in the text stream. Passing $text to through this function gives
-	# a unique text-token which will be reverted back when calling unhash.
-	#
-	# The $boundary argument specify what character should be used to surround
-	# the token. By convension, "B" is used for block elements that needs not
-	# to be wrapped into paragraph tags at the end, ":" is used for elements
-	# that are word separators and "X" is used in the general case.
-	#
-		# Swap back any tag hash found in $text so we do not have to `unhash`
-		# multiple times at the end.
-		$text = $this->unhash($text);
-		
-		# Then hash the block.
-		static $i = 0;
-		$key = "$boundary\x1A" . ++$i . $boundary;
-		$this->html_hashes[$key] = $text;
-		return $key; # String that will replace the tag.
-	}
-
-
-	protected function hashBlock($text) {
-	#
-	# Shortcut function for hashPart with block-level boundaries.
-	#
-		return $this->hashPart($text, 'B');
-	}
-
-
-	protected $block_gamut = array(
-	#
-	# These are all the transformations that form block-level
-	# tags like paragraphs, headers, and list items.
-	#
-        "doFencedCodeBlocks"=> 5,
-		"doHeaders"         => 10,
-		"doHorizontalRules" => 20,
-		
-		"doLists"           => 40,
-		"doCodeBlocks"      => 50,
-		"doBlockQuotes"     => 60,
-		);
-
-	protected function runBlockGamut($text) {
-	#
-	# Run block gamut tranformations.
-	#
-		# We need to escape raw HTML in Markdown source before doing anything 
-		# else. This need to be done for each block, and not only at the 
-		# begining in the Markdown function since hashed blocks can be part of
-		# list items and could have been indented. Indented blocks would have 
-		# been seen as a code block in a previous pass of hashHTMLBlocks.
-		$text = $this->hashHTMLBlocks($text);
-		
-		return $this->runBasicBlockGamut($text);
-	}
-	
-	protected function runBasicBlockGamut($text) {
-	#
-	# Run block gamut tranformations, without hashing HTML blocks. This is 
-	# useful when HTML blocks are known to be already hashed, like in the first
-	# whole-document pass.
-	#
-		foreach ($this->block_gamut as $method => $priority) {
-			$text = $this->$method($text);
-		}
-		
-		# Finally form paragraph and restore hashed blocks.
-		$text = $this->formParagraphs($text);
-
-		return $text;
-	}
-	
-	
-	protected function doHorizontalRules($text) {
-		# Do Horizontal Rules:
-		return preg_replace(
-			'{
-				^[ ]{0,3}	# Leading space
-				([-*_])		# $1: First marker
-				(?>			# Repeated marker group
-					[ ]{0,2}	# Zero, one, or two spaces.
-					\1			# Marker character
-				){2,}		# Group repeated at least twice
-				[ ]*		# Tailing spaces
-				$			# End of line.
-			}mx',
-			"\n".$this->hashBlock("<hr$this->empty_element_suffix")."\n", 
-			$text);
-	}
-
-
-	protected $span_gamut = array(
-	#
-	# These are all the transformations that occur *within* block-level
-	# tags like paragraphs, headers, and list items.
-	#
-		# Process character escapes, code spans, and inline HTML
-		# in one shot.
-		"parseSpan"           => -30,
-
-		# Process anchor and image tags. Images must come first,
-		# because ![foo][f] looks like an anchor.
-		"doImages"            =>  10,
-		"doAnchors"           =>  20,
-		
-		# Make links out of things like `<http://example.com/>`
-		# Must come after doAnchors, because you can use < and >
-		# delimiters in inline links like [this](<url>).
-		"doAutoLinks"         =>  30,
-		"encodeAmpsAndAngles" =>  40,
-
-		"doItalicsAndBold"    =>  50,
-		"doHardBreaks"        =>  60,
-		);
-
-	protected function runSpanGamut($text) {
-	#
-	# Run span gamut tranformations.
-	#
-		foreach ($this->span_gamut as $method => $priority) {
-			$text = $this->$method($text);
-		}
-
-		return $text;
-	}
-	
-	
-	protected function doHardBreaks($text) {
-		# Do hard breaks:
-		return preg_replace_callback('/ {2,}\n/', 
-			array(&$this, '_doHardBreaks_callback'), $text);
-	}
-	protected function _doHardBreaks_callback($matches) {
-		return $this->hashPart("<br$this->empty_element_suffix\n");
-	}
-
-
-	protected function doAnchors($text) {
-	#
-	# Turn Markdown link shortcuts into XHTML <a> tags.
-	#
-		if ($this->in_anchor) return $text;
-		$this->in_anchor = true;
-		
-		#
-		# First, handle reference-style links: [link text] [id]
-		#
-		$text = preg_replace_callback('{
-			(					# wrap whole match in $1
-			  \[
-				('.$this->nested_brackets_re.')	# link text = $2
-			  \]
-
-			  [ ]?				# one optional space
-			  (?:\n[ ]*)?		# one optional newline followed by spaces
-
-			  \[
-				(.*?)		# id = $3
-			  \]
-			)
-			}xs',
-			array(&$this, '_doAnchors_reference_callback'), $text);
-
-		#
-		# Next, inline-style links: [link text](url "optional title")
-		#
-		$text = preg_replace_callback('{
-			(				# wrap whole match in $1
-			  \[
-				('.$this->nested_brackets_re.')	# link text = $2
-			  \]
-			  \(			# literal paren
-				[ \n]*
-				(?:
-					<(.+?)>	# href = $3
-				|
-					('.$this->nested_url_parenthesis_re.')	# href = $4
-				)
-				[ \n]*
-				(			# $5
-				  ([\'"])	# quote char = $6
-				  (.*?)		# Title = $7
-				  \6		# matching quote
-				  [ \n]*	# ignore any spaces/tabs between closing quote and )
-				)?			# title is optional
-			  \)
-			)
-			}xs',
-			array(&$this, '_doAnchors_inline_callback'), $text);
-
-		#
-		# Last, handle reference-style shortcuts: [link text]
-		# These must come last in case you've also got [link text][1]
-		# or [link text](/foo)
-		#
-		$text = preg_replace_callback('{
-			(					# wrap whole match in $1
-			  \[
-				([^\[\]]+)		# link text = $2; can\'t contain [ or ]
-			  \]
-			)
-			}xs',
-			array(&$this, '_doAnchors_reference_callback'), $text);
-
-		$this->in_anchor = false;
-		return $text;
-	}
-	protected function _doAnchors_reference_callback($matches) {
-		$whole_match =  $matches[1];
-		$link_text   =  $matches[2];
-		$link_id     =& $matches[3];
-
-		if ($link_id == "") {
-			# for shortcut links like [this][] or [this].
-			$link_id = $link_text;
-		}
-		
-		# lower-case and turn embedded newlines into spaces
-		$link_id = strtolower($link_id);
-		$link_id = preg_replace('{[ ]?\n}', ' ', $link_id);
-
-		if (isset($this->urls[$link_id])) {
-			$url = $this->urls[$link_id];
-			$url = $this->encodeAttribute($url);
-			
-			$result = "<a rel=\"nofollow\" href=\"$url\"";
-			if ( isset( $this->titles[$link_id] ) ) {
-				$title = $this->titles[$link_id];
-				$title = $this->encodeAttribute($title);
-				$result .=  " title=\"$title\"";
-			}
-		
-			$link_text = $this->runSpanGamut($link_text);
-			$result .= ">$link_text</a>";
-			$result = $this->hashPart($result);
-		}
-		else {
-			$result = $whole_match;
-		}
-		return $result;
-	}
-	protected function _doAnchors_inline_callback($matches) {
-		$whole_match	=  $matches[1];
-		$link_text		=  $this->runSpanGamut($matches[2]);
-		$url			=  $matches[3] == '' ? $matches[4] : $matches[3];
-		$title			=& $matches[7];
-
-		$url = $this->encodeAttribute($url);
-
-		$result = "<a rel=\"nofollow\" href=\"$url\"";
-		if (isset($title)) {
-			$title = $this->encodeAttribute($title);
-			$result .=  " title=\"$title\"";
-		}
-		
-		$link_text = $this->runSpanGamut($link_text);
-		$result .= ">$link_text</a>";
-
-		return $this->hashPart($result);
-	}
-
-
-	protected function doImages($text) {
-	#
-	# Turn Markdown image shortcuts into <img> tags.
-	#
-		#
-		# First, handle reference-style labeled images: ![alt text][id]
-		#
-		$text = preg_replace_callback('{
-			(				# wrap whole match in $1
-			  !\[
-				('.$this->nested_brackets_re.')		# alt text = $2
-			  \]
-
-			  [ ]?				# one optional space
-			  (?:\n[ ]*)?		# one optional newline followed by spaces
-
-			  \[
-				(.*?)		# id = $3
-			  \]
-
-			)
-			}xs', 
-			array(&$this, '_doImages_reference_callback'), $text);
-
-		#
-		# Next, handle inline images:  ![alt text](url "optional title")
-		# Don't forget: encode * and _
-		#
-		$text = preg_replace_callback('{
-			(				# wrap whole match in $1
-			  !\[
-				('.$this->nested_brackets_re.')		# alt text = $2
-			  \]
-			  \s?			# One optional whitespace character
-			  \(			# literal paren
-				[ \n]*
-				(?:
-					<(\S*)>	# src url = $3
-				|
-					('.$this->nested_url_parenthesis_re.')	# src url = $4
-				)
-				[ \n]*
-				(			# $5
-				  ([\'"])	# quote char = $6
-				  (.*?)		# title = $7
-				  \6		# matching quote
-				  [ \n]*
-				)?			# title is optional
-			  \)
-			)
-			}xs',
-			array(&$this, '_doImages_inline_callback'), $text);
-
-		return $text;
-	}
-	protected function _doImages_reference_callback($matches) {
-		$whole_match = $matches[1];
-		$alt_text    = $matches[2];
-		$link_id     = strtolower($matches[3]);
-
-		if ($link_id == "") {
-			$link_id = strtolower($alt_text); # for shortcut links like ![this][].
-		}
-
-		$alt_text = $this->encodeAttribute($alt_text);
-		if (isset($this->urls[$link_id])) {
-			$url = $this->encodeAttribute($this->urls[$link_id]);
-			$result = "<img src=\"$url\" alt=\"$alt_text\"";
-			if (isset($this->titles[$link_id])) {
-				$title = $this->titles[$link_id];
-				$title = $this->encodeAttribute($title);
-				$result .=  " title=\"$title\"";
-			}
-			$result .= $this->empty_element_suffix;
-			$result = $this->hashPart($result);
-		}
-		else {
-			# If there's no such link ID, leave intact:
-			$result = $whole_match;
-		}
-
-		return $result;
-	}
-	protected function _doImages_inline_callback($matches) {
-		$whole_match	= $matches[1];
-		$alt_text		= $matches[2];
-		$url			= $matches[3] == '' ? $matches[4] : $matches[3];
-		$title			=& $matches[7];
-
-		$alt_text = $this->encodeAttribute($alt_text);
-		$url = $this->encodeAttribute($url);
-		$result = "<img src=\"$url\" alt=\"$alt_text\"";
-		if (isset($title)) {
-			$title = $this->encodeAttribute($title);
-			$result .=  " title=\"$title\""; # $title already quoted
-		}
-		$result .= $this->empty_element_suffix;
-
-		return $this->hashPart($result);
-	}
-
-
-	protected function doHeaders($text) {
-		# Setext-style headers:
-		#	  Header 1
-		#	  ========
-		#  
-		#	  Header 2
-		#	  --------
-		#
-		$text = preg_replace_callback('{ ^(.+?)[ ]*\n(=+|-+)[ ]*\n+ }mx',
-			array(&$this, '_doHeaders_callback_setext'), $text);
-
-		# atx-style headers:
-		#	# Header 1
-		#	## Header 2
-		#	## Header 2 with closing hashes ##
-		#	...
-		#	###### Header 6
-		#
-		$text = preg_replace_callback('{
-				^(\#{1,6})	# $1 = string of #\'s
-				[ ]*
-				(.+?)		# $2 = Header text
-				[ ]*
-				\#*			# optional closing #\'s (not counted)
-				\n+
-			}xm',
-			array(&$this, '_doHeaders_callback_atx'), $text);
-
-		return $text;
-	}
-	protected function _doHeaders_callback_setext($matches) {
-		# Terrible hack to check we haven't found an empty list item.
-		if ($matches[2] == '-' && preg_match('{^-(?: |$)}', $matches[1]))
-			return $matches[0];
-		
-		$level = $matches[2]{0} == '=' ? 1 : 2;
-		$block = "<h$level>".$this->runSpanGamut($matches[1])."</h$level>";
-		return "\n" . $this->hashBlock($block) . "\n\n";
-	}
-	protected function _doHeaders_callback_atx($matches) {
-		$level = strlen($matches[1]);
-		$block = "<h$level>".$this->runSpanGamut($matches[2])."</h$level>";
-		return "\n" . $this->hashBlock($block) . "\n\n";
-	}
-
-
-	protected function doLists($text) {
-	#
-	# Form HTML ordered (numbered) and unordered (bulleted) lists.
-	#
-		$less_than_tab = $this->tab_width - 1;
-
-		# Re-usable patterns to match list item bullets and number markers:
-		$marker_ul_re  = '[*+-]';
-		$marker_ol_re  = '\d+[\.]';
-		$marker_any_re = "(?:$marker_ul_re|$marker_ol_re)";
-
-		$markers_relist = array(
-			$marker_ul_re => $marker_ol_re,
-			$marker_ol_re => $marker_ul_re,
-			);
-
-		foreach ($markers_relist as $marker_re => $other_marker_re) {
-			# Re-usable pattern to match any entirel ul or ol list:
-			$whole_list_re = '
-				(								# $1 = whole list
-				  (								# $2
-					([ ]{0,'.$less_than_tab.'})	# $3 = number of spaces
-					('.$marker_re.')			# $4 = first list item marker
-					[ ]+
-				  )
-				  (?s:.+?)
-				  (								# $5
-					  \z
-					|
-					  \n{2,}
-					  (?=\S)
-					  (?!						# Negative lookahead for another list item marker
-						[ ]*
-						'.$marker_re.'[ ]+
-					  )
-					|
-					  (?=						# Lookahead for another kind of list
-					    \n
-						\3						# Must have the same indentation
-						'.$other_marker_re.'[ ]+
-					  )
-				  )
-				)
-			'; // mx
-			
-			# We use a different prefix before nested lists than top-level lists.
-			# See extended comment in _ProcessListItems().
-		
-			if ($this->list_level) {
-				$text = preg_replace_callback('{
-						^
-						'.$whole_list_re.'
-					}mx',
-					array(&$this, '_doLists_callback'), $text);
-			}
-			else {
-				$text = preg_replace_callback('{
-						(?:(?<=\n)\n|\A\n?) # Must eat the newline
-						'.$whole_list_re.'
-					}mx',
-					array(&$this, '_doLists_callback'), $text);
-			}
-		}
-
-		return $text;
-	}
-	protected function _doLists_callback($matches) {
-		# Re-usable patterns to match list item bullets and number markers:
-		$marker_ul_re  = '[*+-]';
-		$marker_ol_re  = '\d+[\.]';
-		$marker_any_re = "(?:$marker_ul_re|$marker_ol_re)";
-		
-		$list = $matches[1];
-		$list_type = preg_match("/$marker_ul_re/", $matches[4]) ? "ul" : "ol";
-		
-		$marker_any_re = ( $list_type == "ul" ? $marker_ul_re : $marker_ol_re );
-		
-		$list .= "\n";
-		$result = $this->processListItems($list, $marker_any_re);
-		
-		$result = $this->hashBlock("<$list_type>\n" . $result . "</$list_type>");
-		return "\n". $result ."\n\n";
-	}
-
-	protected $list_level = 0;
-
-	protected function processListItems($list_str, $marker_any_re) {
-	#
-	#	Process the contents of a single ordered or unordered list, splitting it
-	#	into individual list items.
-	#
-		# The $this->list_level global keeps track of when we're inside a list.
-		# Each time we enter a list, we increment it; when we leave a list,
-		# we decrement. If it's zero, we're not in a list anymore.
-		#
-		# We do this because when we're not inside a list, we want to treat
-		# something like this:
-		#
-		#		I recommend upgrading to version
-		#		8. Oops, now this line is treated
-		#		as a sub-list.
-		#
-		# As a single paragraph, despite the fact that the second line starts
-		# with a digit-period-space sequence.
-		#
-		# Whereas when we're inside a list (or sub-list), that line will be
-		# treated as the start of a sub-list. What a kludge, huh? This is
-		# an aspect of Markdown's syntax that's hard to parse perfectly
-		# without resorting to mind-reading. Perhaps the solution is to
-		# change the syntax rules such that sub-lists must start with a
-		# starting cardinal number; e.g. "1." or "a.".
-		
-		$this->list_level++;
-
-		# trim trailing blank lines:
-		$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);
-
-		$list_str = preg_replace_callback('{
-			(\n)?							# leading line = $1
-			(^[ ]*)							# leading whitespace = $2
-			('.$marker_any_re.'				# list marker and space = $3
-				(?:[ ]+|(?=\n))	# space only required if item is not empty
-			)
-			((?s:.*?))						# list item text   = $4
-			(?:(\n+(?=\n))|\n)				# tailing blank line = $5
-			(?= \n* (\z | \2 ('.$marker_any_re.') (?:[ ]+|(?=\n))))
-			}xm',
-			array(&$this, '_processListItems_callback'), $list_str);
-
-		$this->list_level--;
-		return $list_str;
-	}
-	protected function _processListItems_callback($matches) {
-		$item = $matches[4];
-		$leading_line =& $matches[1];
-		$leading_space =& $matches[2];
-		$marker_space = $matches[3];
-		$tailing_blank_line =& $matches[5];
-
-		if ($leading_line || $tailing_blank_line || 
-			preg_match('/\n{2,}/', $item))
-		{
-			# Replace marker with the appropriate whitespace indentation
-			$item = $leading_space . str_repeat(' ', strlen($marker_space)) . $item;
-			$item = $this->runBlockGamut($this->outdent($item)."\n");
-		}
-		else {
-			# Recursion for sub-lists:
-			$item = $this->doLists($this->outdent($item));
-			$item = preg_replace('/\n+$/', '', $item);
-			$item = $this->runSpanGamut($item);
-		}
-
-		return "<li>" . $item . "</li>\n";
-	}
-
-
-	protected function doCodeBlocks($text) {
-	#
-	#	Process Markdown `<pre><code>` blocks.
-	#
-		$text = preg_replace_callback('{
-				(?:\n\n|\A\n?)
-				(	            # $1 = the code block -- one or more lines, starting with a space/tab
-				  (?>
-					[ ]{'.$this->tab_width.'}  # Lines must start with a tab or a tab-width of spaces
-					.*\n+
-				  )+
-				)
-				((?=^[ ]{0,'.$this->tab_width.'}\S)|\Z)	# Lookahead for non-space at line-start, or end of doc
-			}xm',
-			array(&$this, '_doCodeBlocks_callback'), $text);
-
-		return $text;
-	}
-	protected function _doCodeBlocks_callback($matches) {
-		$codeblock = $matches[1];
-
-		$codeblock = $this->outdent($codeblock);
-		$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
-
-		# trim leading newlines and trailing newlines
-		$codeblock = preg_replace('/\A\n+|\n+\z/', '', $codeblock);
-
-		$codeblock = "<pre><code>$codeblock\n</code></pre>";
-		return "\n\n".$this->hashBlock($codeblock)."\n\n";
-	}
-
-
-	protected function makeCodeSpan($code) {
-	#
-	# Create a code span markup for $code. Called from handleSpanToken.
-	#
-		$code = htmlspecialchars(trim($code), ENT_NOQUOTES);
-		return $this->hashPart("<code>$code</code>");
-	}
-
-
-	protected $em_relist = array(
-		''  => '(?:(?<!\*)\*(?!\*)|(?<!_)_(?!_))(?=\S|$)(?![\.,:;]\s)',
-		'*' => '(?<=\S|^)(?<!\*)\*(?!\*)',
-		'_' => '(?<=\S|^)(?<!_)_(?!_)',
-		);
-	protected $strong_relist = array(
-		''   => '(?:(?<!\*)\*\*(?!\*)|(?<!_)__(?!_))(?=\S|$)(?![\.,:;]\s)',
-		'**' => '(?<=\S|^)(?<!\*)\*\*(?!\*)',
-		'__' => '(?<=\S|^)(?<!_)__(?!_)',
-		);
-	protected $em_strong_relist = array(
-		''    => '(?:(?<!\*)\*\*\*(?!\*)|(?<!_)___(?!_))(?=\S|$)(?![\.,:;]\s)',
-		'***' => '(?<=\S|^)(?<!\*)\*\*\*(?!\*)',
-		'___' => '(?<=\S|^)(?<!_)___(?!_)',
-		);
-	protected $em_strong_prepared_relist;
-	
-	protected function prepareItalicsAndBold() {
-	#
-	# Prepare regular expressions for searching emphasis tokens in any
-	# context.
-	#
-		foreach ($this->em_relist as $em => $em_re) {
-			foreach ($this->strong_relist as $strong => $strong_re) {
-				# Construct list of allowed token expressions.
-				$token_relist = array();
-				if (isset($this->em_strong_relist["$em$strong"])) {
-					$token_relist[] = $this->em_strong_relist["$em$strong"];
-				}
-				$token_relist[] = $em_re;
-				$token_relist[] = $strong_re;
-				
-				# Construct master expression from list.
-				$token_re = '{('. implode('|', $token_relist) .')}';
-				$this->em_strong_prepared_relist["$em$strong"] = $token_re;
-			}
-		}
-	}
-	
-	protected function doItalicsAndBold($text) {
-		$token_stack = array('');
-		$text_stack = array('');
-		$em = '';
-		$strong = '';
-		$tree_char_em = false;
-		
-		while (1) {
-			#
-			# Get prepared regular expression for seraching emphasis tokens
-			# in current context.
-			#
-			$token_re = $this->em_strong_prepared_relist["$em$strong"];
-			
-			#
-			# Each loop iteration search for the next emphasis token. 
-			# Each token is then passed to handleSpanToken.
-			#
-			$parts = preg_split($token_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
-			$text_stack[0] .= $parts[0];
-			$token =& $parts[1];
-			$text =& $parts[2];
-			
-			if (empty($token)) {
-				# Reached end of text span: empty stack without emitting.
-				# any more emphasis.
-				while ($token_stack[0]) {
-					$text_stack[1] .= array_shift($token_stack);
-					$text_stack[0] .= array_shift($text_stack);
-				}
-				break;
-			}
-			
-			$token_len = strlen($token);
-			if ($tree_char_em) {
-				# Reached closing marker while inside a three-char emphasis.
-				if ($token_len == 3) {
-					# Three-char closing marker, close em and strong.
-					array_shift($token_stack);
-					$span = array_shift($text_stack);
-					$span = $this->runSpanGamut($span);
-					$span = "<strong><em>$span</em></strong>";
-					$text_stack[0] .= $this->hashPart($span);
-					$em = '';
-					$strong = '';
-				} else {
-					# Other closing marker: close one em or strong and
-					# change current token state to match the other
-					$token_stack[0] = str_repeat($token{0}, 3-$token_len);
-					$tag = $token_len == 2 ? "strong" : "em";
-					$span = $text_stack[0];
-					$span = $this->runSpanGamut($span);
-					$span = "<$tag>$span</$tag>";
-					$text_stack[0] = $this->hashPart($span);
-					$$tag = ''; # $$tag stands for $em or $strong
-				}
-				$tree_char_em = false;
-			} else if ($token_len == 3) {
-				if ($em) {
-					# Reached closing marker for both em and strong.
-					# Closing strong marker:
-					for ($i = 0; $i < 2; ++$i) {
-						$shifted_token = array_shift($token_stack);
-						$tag = strlen($shifted_token) == 2 ? "strong" : "em";
-						$span = array_shift($text_stack);
-						$span = $this->runSpanGamut($span);
-						$span = "<$tag>$span</$tag>";
-						$text_stack[0] .= $this->hashPart($span);
-						$$tag = ''; # $$tag stands for $em or $strong
-					}
-				} else {
-					# Reached opening three-char emphasis marker. Push on token 
-					# stack; will be handled by the special condition above.
-					$em = $token{0};
-					$strong = "$em$em";
-					array_unshift($token_stack, $token);
-					array_unshift($text_stack, '');
-					$tree_char_em = true;
-				}
-			} else if ($token_len == 2) {
-				if ($strong) {
-					# Unwind any dangling emphasis marker:
-					if (strlen($token_stack[0]) == 1) {
-						$text_stack[1] .= array_shift($token_stack);
-						$text_stack[0] .= array_shift($text_stack);
-					}
-					# Closing strong marker:
-					array_shift($token_stack);
-					$span = array_shift($text_stack);
-					$span = $this->runSpanGamut($span);
-					$span = "<strong>$span</strong>";
-					$text_stack[0] .= $this->hashPart($span);
-					$strong = '';
-				} else {
-					array_unshift($token_stack, $token);
-					array_unshift($text_stack, '');
-					$strong = $token;
-				}
-			} else {
-				# Here $token_len == 1
-				if ($em) {
-					if (strlen($token_stack[0]) == 1) {
-						# Closing emphasis marker:
-						array_shift($token_stack);
-						$span = array_shift($text_stack);
-						$span = $this->runSpanGamut($span);
-						$span = "<em>$span</em>";
-						$text_stack[0] .= $this->hashPart($span);
-						$em = '';
-					} else {
-						$text_stack[0] .= $token;
-					}
-				} else {
-					array_unshift($token_stack, $token);
-					array_unshift($text_stack, '');
-					$em = $token;
-				}
-			}
-		}
-		return $text_stack[0];
-	}
-
-
-	protected function doBlockQuotes($text) {
-		$text = preg_replace_callback('/
-			  (								# Wrap whole match in $1
-				(?>
-				  ^[ ]*>[ ]?			# ">" at the start of a line
-					.+\n					# rest of the first line
-				  (.+\n)*					# subsequent consecutive lines
-				  \n*						# blanks
-				)+
-			  )
-			/xm',
-			array(&$this, '_doBlockQuotes_callback'), $text);
-
-		return $text;
-	}
-	protected function _doBlockQuotes_callback($matches) {
-		$bq = $matches[1];
-		# trim one level of quoting - trim whitespace-only lines
-		$bq = preg_replace('/^[ ]*>[ ]?|^[ ]+$/m', '', $bq);
-		$bq = $this->runBlockGamut($bq);		# recurse
-
-		$bq = preg_replace('/^/m', "  ", $bq);
-		# These leading spaces cause problem with <pre> content, 
-		# so we need to fix that:
-		$bq = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx', 
-			array(&$this, '_doBlockQuotes_callback2'), $bq);
-
-		return "\n". $this->hashBlock("<blockquote>\n$bq\n</blockquote>")."\n\n";
-	}
-	protected function _doBlockQuotes_callback2($matches) {
-		$pre = $matches[1];
-		$pre = preg_replace('/^  /m', '', $pre);
-		return $pre;
-	}
-
-
-	protected function formParagraphs($text) {
-	#
-	#	Params:
-	#		$text - string to process with html <p> tags
-	#
-		# Strip leading and trailing lines:
-		$text = preg_replace('/\A\n+|\n+\z/', '', $text);
-
-		$grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);
-
-		#
-		# Wrap <p> tags and unhashify HTML blocks
-		#
-		foreach ($grafs as $key => $value) {
-			if (!preg_match('/^B\x1A[0-9]+B$/', $value)) {
-				# Is a paragraph.
-				$value = $this->runSpanGamut($value);
-				$value = preg_replace('/^([ ]*)/', "<p>", $value);
-				$value .= "</p>";
-				$grafs[$key] = $this->unhash($value);
-			}
-			else {
-				# Is a block.
-				# Modify elements of @grafs in-place...
-				$graf = $value;
-				$block = $this->html_hashes[$graf];
-				$graf = $block;
-//				if (preg_match('{
-//					\A
-//					(							# $1 = <div> tag
-//					  <div  \s+
-//					  [^>]*
-//					  \b
-//					  markdown\s*=\s*  ([\'"])	#	$2 = attr quote char
-//					  1
-//					  \2
-//					  [^>]*
-//					  >
-//					)
-//					(							# $3 = contents
-//					.*
-//					)
-//					(</div>)					# $4 = closing tag
-//					\z
-//					}xs', $block, $matches))
-//				{
-//					list(, $div_open, , $div_content, $div_close) = $matches;
-//
-//					# We can't call Markdown(), because that resets the hash;
-//					# that initialization code should be pulled into its own sub, though.
-//					$div_content = $this->hashHTMLBlocks($div_content);
-//					
-//					# Run document gamut methods on the content.
-//					foreach ($this->document_gamut as $method => $priority) {
-//						$div_content = $this->$method($div_content);
-//					}
-//
-//					$div_open = preg_replace(
-//						'{\smarkdown\s*=\s*([\'"]).+?\1}', '', $div_open);
-//
-//					$graf = $div_open . "\n" . $div_content . "\n" . $div_close;
-//				}
-				$grafs[$key] = $graf;
-			}
-		}
-
-		return implode("\n\n", $grafs);
-	}
-
-
-	protected function encodeAttribute($text) {
-	#
-	# Encode text for a double-quoted HTML attribute. This function
-	# is *not* suitable for attributes enclosed in single quotes.
-	#
-		$text = $this->encodeAmpsAndAngles($text);
-		$text = str_replace('"', '&quot;', $text);
-		return $text;
-	}
-	
-	
-	protected function encodeAmpsAndAngles($text) {
-	#
-	# Smart processing for ampersands and angle brackets that need to 
-	# be encoded. Valid character entities are left alone unless the
-	# no-entities mode is set.
-	#
-		if ($this->no_entities) {
-			$text = str_replace('&', '&amp;', $text);
-		} else {
-			# Ampersand-encoding based entirely on Nat Irons's Amputator
-			# MT plugin: <http://bumppo.net/projects/amputator/>
-			$text = preg_replace('/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/', 
-								'&amp;', $text);;
-		}
-		# Encode remaining <'s
-		$text = str_replace('<', '&lt;', $text);
-
-		return $text;
-	}
-
-
-	protected function doAutoLinks($text) {
-		$text = preg_replace_callback('/(="|<)?\b(https?|ftp)(:\/\/[-A-Z0-9+&@#\/%?=~_|\[\]\(\)!:,\.;]*[-A-Z0-9+&@#\/%=~_|\[\])])(?=$|\W)/i', 
-			array(&$this, '_doAutoLinks_url_callback'), $text);
-        $text = preg_replace_callback("/<((https?|ftp):[^'\">\s]+)>/i",
-            array(&$this, '_doAutoLinks_url_callback_replace'), $text);
-
-		# Email addresses: <address@domain.foo>
-		$text = preg_replace_callback('{
-			<
-			(?:mailto:)?
-			(
-				(?:
-					[-!#$%&\'*+/=?^_`.{|}~\w\x80-\xFF]+
-				|
-					".*?"
-				)
-				\@
-				(?:
-					[-a-z0-9\x80-\xFF]+(\.[-a-z0-9\x80-\xFF]+)*\.[a-z]+
-				|
-					\[[\d.a-fA-F:]+\]	# IPv4 & IPv6
-				)
-			)
-			>
-			}xi',
-			array(&$this, '_doAutoLinks_email_callback'), $text);
-
-		return $text;
-	}
-
-    protected function _doAutoLinks_url_callback_replace($matches) {
-        $url = $this->encodeAttribute($matches[1]);
-        $link = "<a rel=\"nofollow\" href=\"$url\">$url</a>";
-        return $this->hashPart($link);
-    }
-
-    protected $tail = '';
-
-	protected function _doAutoLinks_url_callback($matches) {
-        list ($wholeMatch, $lookbehind, $protocol, $link) = $matches;
-
-        if ($lookbehind) {
-            return $wholeMatch;
-        }
-
-        if ($link[strlen($link) - 1] != ')') {
-            return '<' . $protocol . $link . '>';
-        }
-
-        $level = 0;
-        if (preg_match_all("/[()]/", $link, $matches)) {
-            foreach ($matches[0] as $op) {
-                if ('(' == $op) {
-                    if ($level <= 0) {
-                        $level = 1;
-                    } else {
-                        $level ++;
-                    }
-                } else {
-                    $level --;
-                }
-            }
-        }
-
-        $this->tail = '';
-        if ($level < 0) {
-            $link = preg_replace("/\){1," . (- $level) . "}$/", $link, array(&$this, '_doAutoLinks_url_callback_callback'));
-        }
-
-		$url = $this->encodeAttribute($matches[2] . $matches[3]);
-		$link = "<a rel=\"nofollow\" href=\"$url\">$url</a>";
-		return '<' . $protocol . $link . '>' . $this->tail;
-	}
-	protected function _doAutoLinks_email_callback($matches) {
-		$address = $matches[1];
-		$link = $this->encodeEmailAddress($address);
-		return $this->hashPart($link);
-	}
-
-    protected function _doAutoLinks_url_callback_callback($matches) {
-        $this->tail = $matches[0];
-        return '';
-    }
-
-	protected function doFencedCodeBlocks($text) {
-	#
-	# Adding the fenced code block syntax to regular Markdown:
-	#
-	# ~~~
-	# Code block
-	# ~~~
-	#
-		$less_than_tab = $this->tab_width;
-	    $text = preg_replace_callback('{
-				(?:\n|\A)
-				# 1: Opening marker
-				(
-					~{3,}|`{3,} # Marker: three tilde or more.
-				)
-				
-				[ ]?(\w+)?(?:,[ ]?(\d+))?[ ]* \n # Whitespace and newline following marker.
-				
-				# 3: Content
-				(
-					(?>
-						(?!\1 [ ]* \n)	# Not a closing marker.
-						.*\n+
-					)+
-				)
-				
-				# Closing marker.
-				\1 [ ]* \n
-			}xm',
-			array(&$this, '_doFencedCodeBlocks_callback'), $text);		
-
-		return $text;
-	}
-
-	protected function _doFencedCodeBlocks_callback($matches) {
-		$codeblock = $matches[4];
-		$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
-		// $codeblock = preg_replace_callback('/^\n+/',
-		//	array(&$this, '_doFencedCodeBlocks_newlines'), $codeblock);
-		//$codeblock = "<pre><code>$codeblock</code></pre>";
-		//$cb = "<pre><code";
-		$cb = empty($matches[3]) ? "<pre><code" : "<pre class=\"linenums:$matches[3]\"><code"; 
-		$cb .= empty($matches[2]) ? ">" : " class=\"lang-$matches[2]\">";
-		$cb .= "$codeblock</code></pre>";
-		return "\n\n".$this->hashBlock($cb)."\n\n";
-	}
-
-
-	protected function encodeEmailAddress($addr) {
-	#
-	#	Input: an email address, e.g. "foo@example.com"
-	#
-	#	Output: the email address as a mailto link, with each character
-	#		of the address encoded as either a decimal or hex entity, in
-	#		the hopes of foiling most address harvesting spam bots. E.g.:
-	#
-	#	  <p><a href="&#109;&#x61;&#105;&#x6c;&#116;&#x6f;&#58;&#x66;o&#111;
-	#        &#x40;&#101;&#x78;&#97;&#x6d;&#112;&#x6c;&#101;&#46;&#x63;&#111;
-	#        &#x6d;">&#x66;o&#111;&#x40;&#101;&#x78;&#97;&#x6d;&#112;&#x6c;
-	#        &#101;&#46;&#x63;&#111;&#x6d;</a></p>
-	#
-	#	Based by a filter by Matthew Wickline, posted to BBEdit-Talk.
-	#   With some optimizations by Milian Wolff.
-	#
-		$addr = "mailto:" . $addr;
-		$chars = preg_split('/(?<!^)(?!$)/', $addr);
-		$seed = (int)abs(crc32($addr) / strlen($addr)); # Deterministic seed.
-		
-		foreach ($chars as $key => $char) {
-			$ord = ord($char);
-			# Ignore non-ascii chars.
-			if ($ord < 128) {
-				$r = ($seed * (1 + $key)) % 100; # Pseudo-random function.
-				# roughly 10% raw, 45% hex, 45% dec
-				# '@' *must* be encoded. I insist.
-				if ($r > 90 && $char != '@') /* do nothing */;
-				else if ($r < 45) $chars[$key] = '&#x'.dechex($ord).';';
-				else              $chars[$key] = '&#'.$ord.';';
-			}
-		}
-		
-		$addr = implode('', $chars);
-		$text = implode('', array_slice($chars, 7)); # text without `mailto:`
-		$addr = "<a href=\"$addr\">$text</a>";
-
-		return $addr;
-	}
-
-
-	protected function parseSpan($str) {
-	#
-	# Take the string $str and parse it into tokens, hashing embeded HTML,
-	# escaped characters and handling code spans.
-	#
-		$output = '';
-		
-		$span_re = '{
-				(
-					\\\\'.$this->escape_chars_re.'
-				|
-					(?<![`\\\\])
-					`+						# code span marker
-			'.( $this->no_markup ? '' : '
-				|
-					<!--    .*?     -->		# comment
-				|
-					<\?.*?\?> | <%.*?%>		# processing instruction
-				|
-					<[!$]?[-a-zA-Z0-9:_]+	# regular tags
-					(?>
-						\s
-						(?>[^"\'>]+|"[^"]*"|\'[^\']*\')*
-					)?
-					>
-				|
-					<[-a-zA-Z0-9:_]+\s*/> # xml-style empty tag
-				|
-					</[-a-zA-Z0-9:_]+\s*> # closing tag
-			').'
-				)
-				}xs';
-
-		while (1) {
-			#
-			# Each loop iteration seach for either the next tag, the next 
-			# openning code span marker, or the next escaped character. 
-			# Each token is then passed to handleSpanToken.
-			#
-			$parts = preg_split($span_re, $str, 2, PREG_SPLIT_DELIM_CAPTURE);
-			
-			# Create token from text preceding tag.
-			if ($parts[0] != "") {
-				$output .= $parts[0];
-			}
-			
-			# Check if we reach the end.
-			if (isset($parts[1])) {
-				$output .= $this->handleSpanToken($parts[1], $parts[2]);
-				$str = $parts[2];
-			}
-			else {
-				break;
-			}
-		}
-		
-		return $output;
-	}
-	
-	
-	protected function handleSpanToken($token, &$str) {
-	#
-	# Handle $token provided by parseSpan by determining its nature and 
-	# returning the corresponding value that should replace it.
-	#
-		switch ($token{0}) {
-			case "\\":
-				return $this->hashPart("&#". ord($token{1}). ";");
-			case "`":
-				# Search for end marker in remaining text.
-				if (preg_match('/^(.*?[^`])'.preg_quote($token).'(?!`)(.*)$/sm', 
-					$str, $matches))
-				{
-					$str = $matches[2];
-					$codespan = $this->makeCodeSpan($matches[1]);
-					return $this->hashPart($codespan);
-				}
-				return $token; // return as text since no ending marker found.
-			default:
-				return $this->hashPart($token);
-		}
-	}
-
-
-	protected function outdent($text) {
-	#
-	# Remove one level of line-leading tabs or spaces
-	#
-		return preg_replace('/^(\t|[ ]{1,'.$this->tab_width.'})/m', '', $text);
-	}
-
-
-	# String length function for detab. `_initDetab` will create a function to 
-	# hanlde UTF-8 if the default function does not exist.
-	protected $utf8_strlen = 'mb_strlen';
-	
-	protected function detab($text) {
-	#
-	# Replace tabs with the appropriate amount of space.
-	#
-		# For each line we separate the line in blocks delemited by
-		# tab characters. Then we reconstruct every line by adding the 
-		# appropriate number of space between each blocks.
-		
-		$text = preg_replace_callback('/^.*\t.*$/m',
-			array(&$this, '_detab_callback'), $text);
-
-		return $text;
-	}
-	protected function _detab_callback($matches) {
-		$line = $matches[0];
-		$strlen = $this->utf8_strlen; # strlen function for UTF-8.
-		
-		# Split in blocks.
-		$blocks = explode("\t", $line);
-		# Add each blocks to the line.
-		$line = $blocks[0];
-		unset($blocks[0]); # Do not add first block twice.
-		foreach ($blocks as $block) {
-			# Calculate amount of space, insert spaces, insert block.
-			$amount = $this->tab_width - 
-				$strlen($line, 'UTF-8') % $this->tab_width;
-			$line .= str_repeat(" ", $amount) . $block;
-		}
-		return $line;
-	}
-	protected function _initDetab() {
-	#
-	# Check for the availability of the function in the `utf8_strlen` property
-	# (initially `mb_strlen`). If the function is not available, create a 
-	# function that will loosely count the number of UTF-8 characters with a
-	# regular expression.
-	#
-		if (function_exists($this->utf8_strlen)) return;
-		$this->utf8_strlen = create_function('$text', 'return preg_match_all(
-			"/[\\\\x00-\\\\xBF]|[\\\\xC0-\\\\xFF][\\\\x80-\\\\xBF]*/", 
-			$text, $m);');
-	}
-
-
-	protected function unhash($text) {
-	#
-	# Swap back in all the tags hashed by _HashHTMLBlocks.
-	#
-		return preg_replace_callback('/(.)\x1A[0-9]+\1/', 
-			array(&$this, '_unhash_callback'), $text);
-	}
-	protected function _unhash_callback($matches) {
-		return $this->html_hashes[$matches[0]];
-	}
-
-}
-
diff --git a/var/MarkdownExtraExtended.php b/var/MarkdownExtraExtended.php
new file mode 100644
index 00000000..b98cf04d
--- /dev/null
+++ b/var/MarkdownExtraExtended.php
@@ -0,0 +1,3245 @@
+<?php
+
+#
+# Markdown  -  A text-to-HTML conversion tool for web writers
+#
+# PHP Markdown  
+# Copyright (c) 2004-2013 Michel Fortin  
+# <http://michelf.com/projects/php-markdown/>
+#
+# Original Markdown  
+# Copyright (c) 2004-2006 John Gruber  
+# <http://daringfireball.net/projects/markdown/>
+#
+
+#
+# Markdown Parser Class
+#
+
+class Markdown {
+
+	### Version ###
+
+	const  MARKDOWNLIB_VERSION  =  "1.3";
+
+	### Simple Function Interface ###
+
+	public static function defaultTransform($text) {
+	#
+	# Initialize the parser and return the result of its transform method.
+	# This will work fine for derived classes too.
+	#
+		# Take parser class on which this function was called.
+		$parser_class = get_called_class();
+
+		# try to take parser from the static parser list
+		static $parser_list;
+		$parser =& $parser_list[$parser_class];
+
+		# create the parser it not already set
+		if (!$parser)
+			$parser = new $parser_class;
+
+		# Transform text using parser.
+		return $parser->transform($text);
+	}
+
+	### Configuration Variables ###
+
+	# Change to ">" for HTML output.
+	public $empty_element_suffix = " />";
+	public $tab_width = 4;
+	
+	# Change to `true` to disallow markup or entities.
+	public $no_markup = false;
+	public $no_entities = false;
+	
+	# Predefined urls and titles for reference links and images.
+	public $predef_urls = array();
+	public $predef_titles = array();
+
+
+	### Parser Implementation ###
+
+	# Regex to match balanced [brackets].
+	# Needed to insert a maximum bracked depth while converting to PHP.
+	protected $nested_brackets_depth = 6;
+	protected $nested_brackets_re;
+	
+	protected $nested_url_parenthesis_depth = 4;
+	protected $nested_url_parenthesis_re;
+
+	# Table of hash values for escaped characters:
+	protected $escape_chars = '\`*_{}[]()>#+-.!';
+	protected $escape_chars_re;
+
+
+	public function __construct() {
+	#
+	# Constructor function. Initialize appropriate member variables.
+	#
+		$this->_initDetab();
+		$this->prepareItalicsAndBold();
+	
+		$this->nested_brackets_re = 
+			str_repeat('(?>[^\[\]]+|\[', $this->nested_brackets_depth).
+			str_repeat('\])*', $this->nested_brackets_depth);
+	
+		$this->nested_url_parenthesis_re = 
+			str_repeat('(?>[^()\s]+|\(', $this->nested_url_parenthesis_depth).
+			str_repeat('(?>\)))*', $this->nested_url_parenthesis_depth);
+		
+		$this->escape_chars_re = '['.preg_quote($this->escape_chars).']';
+		
+		# Sort document, block, and span gamut in ascendent priority order.
+		asort($this->document_gamut);
+		asort($this->block_gamut);
+		asort($this->span_gamut);
+	}
+
+
+	# Internal hashes used during transformation.
+	protected $urls = array();
+	protected $titles = array();
+	protected $html_hashes = array();
+	
+	# Status flag to avoid invalid nesting.
+	protected $in_anchor = false;
+	
+	
+	protected function setup() {
+	#
+	# Called before the transformation process starts to setup parser 
+	# states.
+	#
+		# Clear global hashes.
+		$this->urls = $this->predef_urls;
+		$this->titles = $this->predef_titles;
+		$this->html_hashes = array();
+		
+		$this->in_anchor = false;
+	}
+	
+	protected function teardown() {
+	#
+	# Called after the transformation process to clear any variable 
+	# which may be taking up memory unnecessarly.
+	#
+		$this->urls = array();
+		$this->titles = array();
+		$this->html_hashes = array();
+	}
+
+
+	public function transform($text) {
+	#
+	# Main function. Performs some preprocessing on the input text
+	# and pass it through the document gamut.
+	#
+		$this->setup();
+	
+		# Remove UTF-8 BOM and marker character in input, if present.
+		$text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text);
+
+		# Standardize line endings:
+		#   DOS to Unix and Mac to Unix
+		$text = preg_replace('{\r\n?}', "\n", $text);
+
+		# Make sure $text ends with a couple of newlines:
+		$text .= "\n\n";
+
+		# Convert all tabs to spaces.
+		$text = $this->detab($text);
+
+		# Turn block-level HTML blocks into hash entries
+		$text = $this->hashHTMLBlocks($text);
+
+		# Strip any lines consisting only of spaces and tabs.
+		# This makes subsequent regexen easier to write, because we can
+		# match consecutive blank lines with /\n+/ instead of something
+		# contorted like /[ ]*\n+/ .
+		$text = preg_replace('/^[ ]+$/m', '', $text);
+
+		# Run document gamut methods.
+		foreach ($this->document_gamut as $method => $priority) {
+			$text = $this->$method($text);
+		}
+		
+		$this->teardown();
+
+        $text = preg_replace_callback("/<\/?(\!doctype|html|head|body|link|title|input|select|button|textarea|style|noscript)[^>]*>/is", 
+            'htmlspecialchars', $text);
+
+		return $text . "\n";
+	}
+	
+	protected $document_gamut = array(
+		# Strip link definitions, store in hashes.
+		"stripLinkDefinitions" => 20,
+		
+		"runBasicBlockGamut"   => 30,
+		);
+
+
+	protected function stripLinkDefinitions($text) {
+	#
+	# Strips link definitions from text, stores the URLs and titles in
+	# hash references.
+	#
+		$less_than_tab = $this->tab_width - 1;
+
+		# Link defs are in the form: ^[id]: url "optional title"
+		$text = preg_replace_callback('{
+							^[ ]{0,'.$less_than_tab.'}\[(.+)\][ ]?:	# id = $1
+							  [ ]*
+							  \n?				# maybe *one* newline
+							  [ ]*
+							(?:
+							  <(.+?)>			# url = $2
+							|
+							  (\S+?)			# url = $3
+							)
+							  [ ]*
+							  \n?				# maybe one newline
+							  [ ]*
+							(?:
+								(?<=\s)			# lookbehind for whitespace
+								["(]
+								(.*?)			# title = $4
+								[")]
+								[ ]*
+							)?	# title is optional
+							(?:\n+|\Z)
+			}xm',
+			array(&$this, '_stripLinkDefinitions_callback'),
+			$text);
+		return $text;
+	}
+	protected function _stripLinkDefinitions_callback($matches) {
+		$link_id = strtolower($matches[1]);
+		$url = $matches[2] == '' ? $matches[3] : $matches[2];
+		$this->urls[$link_id] = $url;
+		$this->titles[$link_id] =& $matches[4];
+		return ''; # String that will replace the block
+	}
+
+
+	protected function hashHTMLBlocks($text) {
+		if ($this->no_markup)  return $text;
+
+		$less_than_tab = $this->tab_width - 1;
+
+		# Hashify HTML blocks:
+		# We only want to do this for block-level HTML tags, such as headers,
+		# lists, and tables. That's because we still want to wrap <p>s around
+		# "paragraphs" that are wrapped in non-block-level tags, such as anchors,
+		# phrase emphasis, and spans. The list of tags we're looking for is
+		# hard-coded:
+		#
+		# *  List "a" is made of tags which can be both inline or block-level.
+		#    These will be treated block-level when the start tag is alone on 
+		#    its line, otherwise they're not matched here and will be taken as 
+		#    inline later.
+		# *  List "b" is made of tags which are always block-level;
+		#
+		$block_tags_a_re = 'ins|del';
+		$block_tags_b_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|'.
+						   'script|noscript|form|fieldset|iframe|math|svg|'.
+						   'article|section|nav|aside|hgroup|header|footer|'.
+						   'figure';
+
+		# Regular expression for the content of a block tag.
+		$nested_tags_level = 4;
+		$attr = '
+			(?>				# optional tag attributes
+			  \s			# starts with whitespace
+			  (?>
+				[^>"/]+		# text outside quotes
+			  |
+				/+(?!>)		# slash not followed by ">"
+			  |
+				"[^"]*"		# text inside double quotes (tolerate ">")
+			  |
+				\'[^\']*\'	# text inside single quotes (tolerate ">")
+			  )*
+			)?	
+			';
+		$content =
+			str_repeat('
+				(?>
+				  [^<]+			# content without tag
+				|
+				  <\2			# nested opening tag
+					'.$attr.'	# attributes
+					(?>
+					  />
+					|
+					  >', $nested_tags_level).	# end of opening tag
+					  '.*?'.					# last level nested tag content
+			str_repeat('
+					  </\2\s*>	# closing nested tag
+					)
+				  |				
+					<(?!/\2\s*>	# other tags with a different name
+				  )
+				)*',
+				$nested_tags_level);
+		$content2 = str_replace('\2', '\3', $content);
+
+		# First, look for nested blocks, e.g.:
+		# 	<div>
+		# 		<div>
+		# 		tags for inner block must be indented.
+		# 		</div>
+		# 	</div>
+		#
+		# The outermost tags must start at the left margin for this to match, and
+		# the inner nested divs must be indented.
+		# We need to do this before the next, more liberal match, because the next
+		# match will start at the first `<div>` and stop at the first `</div>`.
+		$text = preg_replace_callback('{(?>
+			(?>
+				(?<=\n\n)		# Starting after a blank line
+				|				# or
+				\A\n?			# the beginning of the doc
+			)
+			(						# save in $1
+
+			  # Match from `\n<tag>` to `</tag>\n`, handling nested tags 
+			  # in between.
+					
+						[ ]{0,'.$less_than_tab.'}
+						<('.$block_tags_b_re.')# start tag = $2
+						'.$attr.'>			# attributes followed by > and \n
+						'.$content.'		# content, support nesting
+						</\2>				# the matching end tag
+						[ ]*				# trailing spaces/tabs
+						(?=\n+|\Z)	# followed by a newline or end of document
+
+			| # Special version for tags of group a.
+
+						[ ]{0,'.$less_than_tab.'}
+						<('.$block_tags_a_re.')# start tag = $3
+						'.$attr.'>[ ]*\n	# attributes followed by >
+						'.$content2.'		# content, support nesting
+						</\3>				# the matching end tag
+						[ ]*				# trailing spaces/tabs
+						(?=\n+|\Z)	# followed by a newline or end of document
+					
+			| # Special case just for <hr />. It was easier to make a special 
+			  # case than to make the other regex more complicated.
+			
+						[ ]{0,'.$less_than_tab.'}
+						<(hr)				# start tag = $2
+						'.$attr.'			# attributes
+						/?>					# the matching end tag
+						[ ]*
+						(?=\n{2,}|\Z)		# followed by a blank line or end of document
+			
+			| # Special case for standalone HTML comments:
+			
+					[ ]{0,'.$less_than_tab.'}
+					(?s:
+						<!-- .*? -->
+					)
+					[ ]*
+					(?=\n{2,}|\Z)		# followed by a blank line or end of document
+			
+			| # PHP and ASP-style processor instructions (<? and <%)
+			
+					[ ]{0,'.$less_than_tab.'}
+					(?s:
+						<([?%])			# $2
+						.*?
+						\2>
+					)
+					[ ]*
+					(?=\n{2,}|\Z)		# followed by a blank line or end of document
+					
+			)
+			)}Sxmi',
+			array(&$this, '_hashHTMLBlocks_callback'),
+			$text);
+
+		return $text;
+	}
+	protected function _hashHTMLBlocks_callback($matches) {
+		$text = $matches[1];
+		$key  = $this->hashBlock($text);
+		return "\n\n$key\n\n";
+	}
+	
+	
+	protected function hashPart($text, $boundary = 'X') {
+	#
+	# Called whenever a tag must be hashed when a function insert an atomic 
+	# element in the text stream. Passing $text to through this function gives
+	# a unique text-token which will be reverted back when calling unhash.
+	#
+	# The $boundary argument specify what character should be used to surround
+	# the token. By convension, "B" is used for block elements that needs not
+	# to be wrapped into paragraph tags at the end, ":" is used for elements
+	# that are word separators and "X" is used in the general case.
+	#
+		# Swap back any tag hash found in $text so we do not have to `unhash`
+		# multiple times at the end.
+		$text = $this->unhash($text);
+		
+		# Then hash the block.
+		static $i = 0;
+		$key = "$boundary\x1A" . ++$i . $boundary;
+		$this->html_hashes[$key] = $text;
+		return $key; # String that will replace the tag.
+	}
+
+
+	protected function hashBlock($text) {
+	#
+	# Shortcut function for hashPart with block-level boundaries.
+	#
+		return $this->hashPart($text, 'B');
+	}
+
+
+	protected $block_gamut = array(
+	#
+	# These are all the transformations that form block-level
+	# tags like paragraphs, headers, and list items.
+	#
+		"doHeaders"         => 10,
+		"doHorizontalRules" => 20,
+		
+		"doLists"           => 40,
+		"doCodeBlocks"      => 50,
+		"doBlockQuotes"     => 60,
+		);
+
+	protected function runBlockGamut($text) {
+	#
+	# Run block gamut tranformations.
+	#
+		# We need to escape raw HTML in Markdown source before doing anything 
+		# else. This need to be done for each block, and not only at the 
+		# begining in the Markdown function since hashed blocks can be part of
+		# list items and could have been indented. Indented blocks would have 
+		# been seen as a code block in a previous pass of hashHTMLBlocks.
+		$text = $this->hashHTMLBlocks($text);
+		
+		return $this->runBasicBlockGamut($text);
+	}
+	
+	protected function runBasicBlockGamut($text) {
+	#
+	# Run block gamut tranformations, without hashing HTML blocks. This is 
+	# useful when HTML blocks are known to be already hashed, like in the first
+	# whole-document pass.
+	#
+		foreach ($this->block_gamut as $method => $priority) {
+			$text = $this->$method($text);
+		}
+		
+		# Finally form paragraph and restore hashed blocks.
+		$text = $this->formParagraphs($text);
+
+		return $text;
+	}
+	
+	
+	protected function doHorizontalRules($text) {
+		# Do Horizontal Rules:
+		return preg_replace(
+			'{
+				^[ ]{0,3}	# Leading space
+				([-*_])		# $1: First marker
+				(?>			# Repeated marker group
+					[ ]{0,2}	# Zero, one, or two spaces.
+					\1			# Marker character
+				){2,}		# Group repeated at least twice
+				[ ]*		# Tailing spaces
+				$			# End of line.
+			}mx',
+			"\n".$this->hashBlock("<hr$this->empty_element_suffix")."\n", 
+			$text);
+	}
+
+
+	protected $span_gamut = array(
+	#
+	# These are all the transformations that occur *within* block-level
+	# tags like paragraphs, headers, and list items.
+	#
+		# Process character escapes, code spans, and inline HTML
+		# in one shot.
+		"parseSpan"           => -30,
+
+		# Process anchor and image tags. Images must come first,
+		# because ![foo][f] looks like an anchor.
+		"doImages"            =>  10,
+		"doAnchors"           =>  20,
+		
+		# Make links out of things like `<http://example.com/>`
+		# Must come after doAnchors, because you can use < and >
+		# delimiters in inline links like [this](<url>).
+		"doAutoLinks"         =>  30,
+		"encodeAmpsAndAngles" =>  40,
+
+		"doItalicsAndBold"    =>  50,
+		"doHardBreaks"        =>  60,
+		);
+
+	protected function runSpanGamut($text) {
+	#
+	# Run span gamut tranformations.
+	#
+		foreach ($this->span_gamut as $method => $priority) {
+			$text = $this->$method($text);
+		}
+
+		return $text;
+	}
+	
+	
+	protected function doHardBreaks($text) {
+		# Do hard breaks:
+		return preg_replace_callback('/ {2,}\n/', 
+			array(&$this, '_doHardBreaks_callback'), $text);
+	}
+	protected function _doHardBreaks_callback($matches) {
+		return $this->hashPart("<br$this->empty_element_suffix\n");
+	}
+
+
+	protected function doAnchors($text) {
+	#
+	# Turn Markdown link shortcuts into XHTML <a> tags.
+	#
+		if ($this->in_anchor) return $text;
+		$this->in_anchor = true;
+		
+		#
+		# First, handle reference-style links: [link text] [id]
+		#
+		$text = preg_replace_callback('{
+			(					# wrap whole match in $1
+			  \[
+				('.$this->nested_brackets_re.')	# link text = $2
+			  \]
+
+			  [ ]?				# one optional space
+			  (?:\n[ ]*)?		# one optional newline followed by spaces
+
+			  \[
+				(.*?)		# id = $3
+			  \]
+			)
+			}xs',
+			array(&$this, '_doAnchors_reference_callback'), $text);
+
+		#
+		# Next, inline-style links: [link text](url "optional title")
+		#
+		$text = preg_replace_callback('{
+			(				# wrap whole match in $1
+			  \[
+				('.$this->nested_brackets_re.')	# link text = $2
+			  \]
+			  \(			# literal paren
+				[ \n]*
+				(?:
+					<(.+?)>	# href = $3
+				|
+					('.$this->nested_url_parenthesis_re.')	# href = $4
+				)
+				[ \n]*
+				(			# $5
+				  ([\'"])	# quote char = $6
+				  (.*?)		# Title = $7
+				  \6		# matching quote
+				  [ \n]*	# ignore any spaces/tabs between closing quote and )
+				)?			# title is optional
+			  \)
+			)
+			}xs',
+			array(&$this, '_doAnchors_inline_callback'), $text);
+
+		#
+		# Last, handle reference-style shortcuts: [link text]
+		# These must come last in case you've also got [link text][1]
+		# or [link text](/foo)
+		#
+		$text = preg_replace_callback('{
+			(					# wrap whole match in $1
+			  \[
+				([^\[\]]+)		# link text = $2; can\'t contain [ or ]
+			  \]
+			)
+			}xs',
+			array(&$this, '_doAnchors_reference_callback'), $text);
+
+		$this->in_anchor = false;
+		return $text;
+	}
+	protected function _doAnchors_reference_callback($matches) {
+		$whole_match =  $matches[1];
+		$link_text   =  $matches[2];
+		$link_id     =& $matches[3];
+
+		if ($link_id == "") {
+			# for shortcut links like [this][] or [this].
+			$link_id = $link_text;
+		}
+		
+		# lower-case and turn embedded newlines into spaces
+		$link_id = strtolower($link_id);
+		$link_id = preg_replace('{[ ]?\n}', ' ', $link_id);
+
+		if (isset($this->urls[$link_id])) {
+			$url = $this->urls[$link_id];
+			$url = $this->encodeAttribute($url);
+			
+			$result = "<a href=\"$url\"";
+			if ( isset( $this->titles[$link_id] ) ) {
+				$title = $this->titles[$link_id];
+				$title = $this->encodeAttribute($title);
+				$result .=  " title=\"$title\"";
+			}
+		
+			$link_text = $this->runSpanGamut($link_text);
+			$result .= ">$link_text</a>";
+			$result = $this->hashPart($result);
+		}
+		else {
+			$result = $whole_match;
+		}
+		return $result;
+	}
+	protected function _doAnchors_inline_callback($matches) {
+		$whole_match	=  $matches[1];
+		$link_text		=  $this->runSpanGamut($matches[2]);
+		$url			=  $matches[3] == '' ? $matches[4] : $matches[3];
+		$title			=& $matches[7];
+
+		$url = $this->encodeAttribute($url);
+
+		$result = "<a href=\"$url\"";
+		if (isset($title)) {
+			$title = $this->encodeAttribute($title);
+			$result .=  " title=\"$title\"";
+		}
+		
+		$link_text = $this->runSpanGamut($link_text);
+		$result .= ">$link_text</a>";
+
+		return $this->hashPart($result);
+	}
+
+
+	protected function doImages($text) {
+	#
+	# Turn Markdown image shortcuts into <img> tags.
+	#
+		#
+		# First, handle reference-style labeled images: ![alt text][id]
+		#
+		$text = preg_replace_callback('{
+			(				# wrap whole match in $1
+			  !\[
+				('.$this->nested_brackets_re.')		# alt text = $2
+			  \]
+
+			  [ ]?				# one optional space
+			  (?:\n[ ]*)?		# one optional newline followed by spaces
+
+			  \[
+				(.*?)		# id = $3
+			  \]
+
+			)
+			}xs', 
+			array(&$this, '_doImages_reference_callback'), $text);
+
+		#
+		# Next, handle inline images:  ![alt text](url "optional title")
+		# Don't forget: encode * and _
+		#
+		$text = preg_replace_callback('{
+			(				# wrap whole match in $1
+			  !\[
+				('.$this->nested_brackets_re.')		# alt text = $2
+			  \]
+			  \s?			# One optional whitespace character
+			  \(			# literal paren
+				[ \n]*
+				(?:
+					<(\S*)>	# src url = $3
+				|
+					('.$this->nested_url_parenthesis_re.')	# src url = $4
+				)
+				[ \n]*
+				(			# $5
+				  ([\'"])	# quote char = $6
+				  (.*?)		# title = $7
+				  \6		# matching quote
+				  [ \n]*
+				)?			# title is optional
+			  \)
+			)
+			}xs',
+			array(&$this, '_doImages_inline_callback'), $text);
+
+		return $text;
+	}
+	protected function _doImages_reference_callback($matches) {
+		$whole_match = $matches[1];
+		$alt_text    = $matches[2];
+		$link_id     = strtolower($matches[3]);
+
+		if ($link_id == "") {
+			$link_id = strtolower($alt_text); # for shortcut links like ![this][].
+		}
+
+		$alt_text = $this->encodeAttribute($alt_text);
+		if (isset($this->urls[$link_id])) {
+			$url = $this->encodeAttribute($this->urls[$link_id]);
+			$result = "<img src=\"$url\" alt=\"$alt_text\"";
+			if (isset($this->titles[$link_id])) {
+				$title = $this->titles[$link_id];
+				$title = $this->encodeAttribute($title);
+				$result .=  " title=\"$title\"";
+			}
+			$result .= $this->empty_element_suffix;
+			$result = $this->hashPart($result);
+		}
+		else {
+			# If there's no such link ID, leave intact:
+			$result = $whole_match;
+		}
+
+		return $result;
+	}
+	protected function _doImages_inline_callback($matches) {
+		$whole_match	= $matches[1];
+		$alt_text		= $matches[2];
+		$url			= $matches[3] == '' ? $matches[4] : $matches[3];
+		$title			=& $matches[7];
+
+		$alt_text = $this->encodeAttribute($alt_text);
+		$url = $this->encodeAttribute($url);
+		$result = "<img src=\"$url\" alt=\"$alt_text\"";
+		if (isset($title)) {
+			$title = $this->encodeAttribute($title);
+			$result .=  " title=\"$title\""; # $title already quoted
+		}
+		$result .= $this->empty_element_suffix;
+
+		return $this->hashPart($result);
+	}
+
+
+	protected function doHeaders($text) {
+		# Setext-style headers:
+		#	  Header 1
+		#	  ========
+		#  
+		#	  Header 2
+		#	  --------
+		#
+		$text = preg_replace_callback('{ ^(.+?)[ ]*\n(=+|-+)[ ]*\n+ }mx',
+			array(&$this, '_doHeaders_callback_setext'), $text);
+
+		# atx-style headers:
+		#	# Header 1
+		#	## Header 2
+		#	## Header 2 with closing hashes ##
+		#	...
+		#	###### Header 6
+		#
+		$text = preg_replace_callback('{
+				^(\#{1,6})	# $1 = string of #\'s
+				[ ]*
+				(.+?)		# $2 = Header text
+				[ ]*
+				\#*			# optional closing #\'s (not counted)
+				\n+
+			}xm',
+			array(&$this, '_doHeaders_callback_atx'), $text);
+
+		return $text;
+	}
+	protected function _doHeaders_callback_setext($matches) {
+		# Terrible hack to check we haven't found an empty list item.
+		if ($matches[2] == '-' && preg_match('{^-(?: |$)}', $matches[1]))
+			return $matches[0];
+		
+		$level = $matches[2]{0} == '=' ? 1 : 2;
+		$block = "<h$level>".$this->runSpanGamut($matches[1])."</h$level>";
+		return "\n" . $this->hashBlock($block) . "\n\n";
+	}
+	protected function _doHeaders_callback_atx($matches) {
+		$level = strlen($matches[1]);
+		$block = "<h$level>".$this->runSpanGamut($matches[2])."</h$level>";
+		return "\n" . $this->hashBlock($block) . "\n\n";
+	}
+
+
+	protected function doLists($text) {
+	#
+	# Form HTML ordered (numbered) and unordered (bulleted) lists.
+	#
+		$less_than_tab = $this->tab_width - 1;
+
+		# Re-usable patterns to match list item bullets and number markers:
+		$marker_ul_re  = '[*+-]';
+		$marker_ol_re  = '\d+[\.]';
+		$marker_any_re = "(?:$marker_ul_re|$marker_ol_re)";
+
+		$markers_relist = array(
+			$marker_ul_re => $marker_ol_re,
+			$marker_ol_re => $marker_ul_re,
+			);
+
+		foreach ($markers_relist as $marker_re => $other_marker_re) {
+			# Re-usable pattern to match any entirel ul or ol list:
+			$whole_list_re = '
+				(								# $1 = whole list
+				  (								# $2
+					([ ]{0,'.$less_than_tab.'})	# $3 = number of spaces
+					('.$marker_re.')			# $4 = first list item marker
+					[ ]+
+				  )
+				  (?s:.+?)
+				  (								# $5
+					  \z
+					|
+					  \n{2,}
+					  (?=\S)
+					  (?!						# Negative lookahead for another list item marker
+						[ ]*
+						'.$marker_re.'[ ]+
+					  )
+					|
+					  (?=						# Lookahead for another kind of list
+					    \n
+						\3						# Must have the same indentation
+						'.$other_marker_re.'[ ]+
+					  )
+				  )
+				)
+			'; // mx
+			
+			# We use a different prefix before nested lists than top-level lists.
+			# See extended comment in _ProcessListItems().
+		
+			if ($this->list_level) {
+				$text = preg_replace_callback('{
+						^
+						'.$whole_list_re.'
+					}mx',
+					array(&$this, '_doLists_callback'), $text);
+			}
+			else {
+				$text = preg_replace_callback('{
+						(?:(?<=\n)\n|\A\n?) # Must eat the newline
+						'.$whole_list_re.'
+					}mx',
+					array(&$this, '_doLists_callback'), $text);
+			}
+		}
+
+		return $text;
+	}
+	protected function _doLists_callback($matches) {
+		# Re-usable patterns to match list item bullets and number markers:
+		$marker_ul_re  = '[*+-]';
+		$marker_ol_re  = '\d+[\.]';
+		$marker_any_re = "(?:$marker_ul_re|$marker_ol_re)";
+		
+		$list = $matches[1];
+		$list_type = preg_match("/$marker_ul_re/", $matches[4]) ? "ul" : "ol";
+		
+		$marker_any_re = ( $list_type == "ul" ? $marker_ul_re : $marker_ol_re );
+		
+		$list .= "\n";
+		$result = $this->processListItems($list, $marker_any_re);
+		
+		$result = $this->hashBlock("<$list_type>\n" . $result . "</$list_type>");
+		return "\n". $result ."\n\n";
+	}
+
+	protected $list_level = 0;
+
+	protected function processListItems($list_str, $marker_any_re) {
+	#
+	#	Process the contents of a single ordered or unordered list, splitting it
+	#	into individual list items.
+	#
+		# The $this->list_level global keeps track of when we're inside a list.
+		# Each time we enter a list, we increment it; when we leave a list,
+		# we decrement. If it's zero, we're not in a list anymore.
+		#
+		# We do this because when we're not inside a list, we want to treat
+		# something like this:
+		#
+		#		I recommend upgrading to version
+		#		8. Oops, now this line is treated
+		#		as a sub-list.
+		#
+		# As a single paragraph, despite the fact that the second line starts
+		# with a digit-period-space sequence.
+		#
+		# Whereas when we're inside a list (or sub-list), that line will be
+		# treated as the start of a sub-list. What a kludge, huh? This is
+		# an aspect of Markdown's syntax that's hard to parse perfectly
+		# without resorting to mind-reading. Perhaps the solution is to
+		# change the syntax rules such that sub-lists must start with a
+		# starting cardinal number; e.g. "1." or "a.".
+		
+		$this->list_level++;
+
+		# trim trailing blank lines:
+		$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);
+
+		$list_str = preg_replace_callback('{
+			(\n)?							# leading line = $1
+			(^[ ]*)							# leading whitespace = $2
+			('.$marker_any_re.'				# list marker and space = $3
+				(?:[ ]+|(?=\n))	# space only required if item is not empty
+			)
+			((?s:.*?))						# list item text   = $4
+			(?:(\n+(?=\n))|\n)				# tailing blank line = $5
+			(?= \n* (\z | \2 ('.$marker_any_re.') (?:[ ]+|(?=\n))))
+			}xm',
+			array(&$this, '_processListItems_callback'), $list_str);
+
+		$this->list_level--;
+		return $list_str;
+	}
+	protected function _processListItems_callback($matches) {
+		$item = $matches[4];
+		$leading_line =& $matches[1];
+		$leading_space =& $matches[2];
+		$marker_space = $matches[3];
+		$tailing_blank_line =& $matches[5];
+
+		if ($leading_line || $tailing_blank_line || 
+			preg_match('/\n{2,}/', $item))
+		{
+			# Replace marker with the appropriate whitespace indentation
+			$item = $leading_space . str_repeat(' ', strlen($marker_space)) . $item;
+			$item = $this->runBlockGamut($this->outdent($item)."\n");
+		}
+		else {
+			# Recursion for sub-lists:
+			$item = $this->doLists($this->outdent($item));
+			$item = preg_replace('/\n+$/', '', $item);
+			$item = $this->runSpanGamut($item);
+		}
+
+		return "<li>" . $item . "</li>\n";
+	}
+
+
+	protected function doCodeBlocks($text) {
+	#
+	#	Process Markdown `<pre><code>` blocks.
+	#
+		$text = preg_replace_callback('{
+				(?:\n\n|\A\n?)
+				(	            # $1 = the code block -- one or more lines, starting with a space/tab
+				  (?>
+					[ ]{'.$this->tab_width.'}  # Lines must start with a tab or a tab-width of spaces
+					.*\n+
+				  )+
+				)
+				((?=^[ ]{0,'.$this->tab_width.'}\S)|\Z)	# Lookahead for non-space at line-start, or end of doc
+			}xm',
+			array(&$this, '_doCodeBlocks_callback'), $text);
+
+		return $text;
+	}
+	protected function _doCodeBlocks_callback($matches) {
+		$codeblock = $matches[1];
+
+		$codeblock = $this->outdent($codeblock);
+		$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
+
+		# trim leading newlines and trailing newlines
+		$codeblock = preg_replace('/\A\n+|\n+\z/', '', $codeblock);
+
+		$codeblock = "<pre><code>$codeblock\n</code></pre>";
+		return "\n\n".$this->hashBlock($codeblock)."\n\n";
+	}
+
+
+	protected function makeCodeSpan($code) {
+	#
+	# Create a code span markup for $code. Called from handleSpanToken.
+	#
+		$code = htmlspecialchars(trim($code), ENT_NOQUOTES);
+		return $this->hashPart("<code>$code</code>");
+	}
+
+
+	protected $em_relist = array(
+		''  => '(?:(?<!\*)\*(?!\*)|(?<!_)_(?!_))(?=\S|$)(?![\.,:;]\s)',
+		'*' => '(?<=\S|^)(?<!\*)\*(?!\*)',
+		'_' => '(?<=\S|^)(?<!_)_(?!_)',
+		);
+	protected $strong_relist = array(
+		''   => '(?:(?<!\*)\*\*(?!\*)|(?<!_)__(?!_))(?=\S|$)(?![\.,:;]\s)',
+		'**' => '(?<=\S|^)(?<!\*)\*\*(?!\*)',
+		'__' => '(?<=\S|^)(?<!_)__(?!_)',
+		);
+	protected $em_strong_relist = array(
+		''    => '(?:(?<!\*)\*\*\*(?!\*)|(?<!_)___(?!_))(?=\S|$)(?![\.,:;]\s)',
+		'***' => '(?<=\S|^)(?<!\*)\*\*\*(?!\*)',
+		'___' => '(?<=\S|^)(?<!_)___(?!_)',
+		);
+	protected $em_strong_prepared_relist;
+	
+	protected function prepareItalicsAndBold() {
+	#
+	# Prepare regular expressions for searching emphasis tokens in any
+	# context.
+	#
+		foreach ($this->em_relist as $em => $em_re) {
+			foreach ($this->strong_relist as $strong => $strong_re) {
+				# Construct list of allowed token expressions.
+				$token_relist = array();
+				if (isset($this->em_strong_relist["$em$strong"])) {
+					$token_relist[] = $this->em_strong_relist["$em$strong"];
+				}
+				$token_relist[] = $em_re;
+				$token_relist[] = $strong_re;
+				
+				# Construct master expression from list.
+				$token_re = '{('. implode('|', $token_relist) .')}';
+				$this->em_strong_prepared_relist["$em$strong"] = $token_re;
+			}
+		}
+	}
+	
+	protected function doItalicsAndBold($text) {
+		$token_stack = array('');
+		$text_stack = array('');
+		$em = '';
+		$strong = '';
+		$tree_char_em = false;
+		
+		while (1) {
+			#
+			# Get prepared regular expression for seraching emphasis tokens
+			# in current context.
+			#
+			$token_re = $this->em_strong_prepared_relist["$em$strong"];
+			
+			#
+			# Each loop iteration search for the next emphasis token. 
+			# Each token is then passed to handleSpanToken.
+			#
+			$parts = preg_split($token_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
+			$text_stack[0] .= $parts[0];
+			$token =& $parts[1];
+			$text =& $parts[2];
+			
+			if (empty($token)) {
+				# Reached end of text span: empty stack without emitting.
+				# any more emphasis.
+				while ($token_stack[0]) {
+					$text_stack[1] .= array_shift($token_stack);
+					$text_stack[0] .= array_shift($text_stack);
+				}
+				break;
+			}
+			
+			$token_len = strlen($token);
+			if ($tree_char_em) {
+				# Reached closing marker while inside a three-char emphasis.
+				if ($token_len == 3) {
+					# Three-char closing marker, close em and strong.
+					array_shift($token_stack);
+					$span = array_shift($text_stack);
+					$span = $this->runSpanGamut($span);
+					$span = "<strong><em>$span</em></strong>";
+					$text_stack[0] .= $this->hashPart($span);
+					$em = '';
+					$strong = '';
+				} else {
+					# Other closing marker: close one em or strong and
+					# change current token state to match the other
+					$token_stack[0] = str_repeat($token{0}, 3-$token_len);
+					$tag = $token_len == 2 ? "strong" : "em";
+					$span = $text_stack[0];
+					$span = $this->runSpanGamut($span);
+					$span = "<$tag>$span</$tag>";
+					$text_stack[0] = $this->hashPart($span);
+					$$tag = ''; # $$tag stands for $em or $strong
+				}
+				$tree_char_em = false;
+			} else if ($token_len == 3) {
+				if ($em) {
+					# Reached closing marker for both em and strong.
+					# Closing strong marker:
+					for ($i = 0; $i < 2; ++$i) {
+						$shifted_token = array_shift($token_stack);
+						$tag = strlen($shifted_token) == 2 ? "strong" : "em";
+						$span = array_shift($text_stack);
+						$span = $this->runSpanGamut($span);
+						$span = "<$tag>$span</$tag>";
+						$text_stack[0] .= $this->hashPart($span);
+						$$tag = ''; # $$tag stands for $em or $strong
+					}
+				} else {
+					# Reached opening three-char emphasis marker. Push on token 
+					# stack; will be handled by the special condition above.
+					$em = $token{0};
+					$strong = "$em$em";
+					array_unshift($token_stack, $token);
+					array_unshift($text_stack, '');
+					$tree_char_em = true;
+				}
+			} else if ($token_len == 2) {
+				if ($strong) {
+					# Unwind any dangling emphasis marker:
+					if (strlen($token_stack[0]) == 1) {
+						$text_stack[1] .= array_shift($token_stack);
+						$text_stack[0] .= array_shift($text_stack);
+					}
+					# Closing strong marker:
+					array_shift($token_stack);
+					$span = array_shift($text_stack);
+					$span = $this->runSpanGamut($span);
+					$span = "<strong>$span</strong>";
+					$text_stack[0] .= $this->hashPart($span);
+					$strong = '';
+				} else {
+					array_unshift($token_stack, $token);
+					array_unshift($text_stack, '');
+					$strong = $token;
+				}
+			} else {
+				# Here $token_len == 1
+				if ($em) {
+					if (strlen($token_stack[0]) == 1) {
+						# Closing emphasis marker:
+						array_shift($token_stack);
+						$span = array_shift($text_stack);
+						$span = $this->runSpanGamut($span);
+						$span = "<em>$span</em>";
+						$text_stack[0] .= $this->hashPart($span);
+						$em = '';
+					} else {
+						$text_stack[0] .= $token;
+					}
+				} else {
+					array_unshift($token_stack, $token);
+					array_unshift($text_stack, '');
+					$em = $token;
+				}
+			}
+		}
+		return $text_stack[0];
+	}
+
+
+	protected function doBlockQuotes($text) {
+		$text = preg_replace_callback('/
+			  (								# Wrap whole match in $1
+				(?>
+				  ^[ ]*>[ ]?			# ">" at the start of a line
+					.+\n					# rest of the first line
+				  (.+\n)*					# subsequent consecutive lines
+				  \n*						# blanks
+				)+
+			  )
+			/xm',
+			array(&$this, '_doBlockQuotes_callback'), $text);
+
+		return $text;
+	}
+	protected function _doBlockQuotes_callback($matches) {
+		$bq = $matches[1];
+		# trim one level of quoting - trim whitespace-only lines
+		$bq = preg_replace('/^[ ]*>[ ]?|^[ ]+$/m', '', $bq);
+		$bq = $this->runBlockGamut($bq);		# recurse
+
+		$bq = preg_replace('/^/m', "  ", $bq);
+		# These leading spaces cause problem with <pre> content, 
+		# so we need to fix that:
+		$bq = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx', 
+			array(&$this, '_doBlockQuotes_callback2'), $bq);
+
+		return "\n". $this->hashBlock("<blockquote>\n$bq\n</blockquote>")."\n\n";
+	}
+	protected function _doBlockQuotes_callback2($matches) {
+		$pre = $matches[1];
+		$pre = preg_replace('/^  /m', '', $pre);
+		return $pre;
+	}
+
+
+	protected function formParagraphs($text) {
+	#
+	#	Params:
+	#		$text - string to process with html <p> tags
+	#
+		# Strip leading and trailing lines:
+		$text = preg_replace('/\A\n+|\n+\z/', '', $text);
+
+		$grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);
+
+		#
+		# Wrap <p> tags and unhashify HTML blocks
+		#
+		foreach ($grafs as $key => $value) {
+			if (!preg_match('/^B\x1A[0-9]+B$/', $value)) {
+				# Is a paragraph.
+				$value = $this->runSpanGamut($value);
+				$value = preg_replace('/^([ ]*)/', "<p>", $value);
+				$value .= "</p>";
+				$grafs[$key] = $this->unhash($value);
+			}
+			else {
+				# Is a block.
+				# Modify elements of @grafs in-place...
+				$graf = $value;
+				$block = $this->html_hashes[$graf];
+				$graf = $block;
+//				if (preg_match('{
+//					\A
+//					(							# $1 = <div> tag
+//					  <div  \s+
+//					  [^>]*
+//					  \b
+//					  markdown\s*=\s*  ([\'"])	#	$2 = attr quote char
+//					  1
+//					  \2
+//					  [^>]*
+//					  >
+//					)
+//					(							# $3 = contents
+//					.*
+//					)
+//					(</div>)					# $4 = closing tag
+//					\z
+//					}xs', $block, $matches))
+//				{
+//					list(, $div_open, , $div_content, $div_close) = $matches;
+//
+//					# We can't call Markdown(), because that resets the hash;
+//					# that initialization code should be pulled into its own sub, though.
+//					$div_content = $this->hashHTMLBlocks($div_content);
+//					
+//					# Run document gamut methods on the content.
+//					foreach ($this->document_gamut as $method => $priority) {
+//						$div_content = $this->$method($div_content);
+//					}
+//
+//					$div_open = preg_replace(
+//						'{\smarkdown\s*=\s*([\'"]).+?\1}', '', $div_open);
+//
+//					$graf = $div_open . "\n" . $div_content . "\n" . $div_close;
+//				}
+				$grafs[$key] = $graf;
+			}
+		}
+
+		return implode("\n\n", $grafs);
+	}
+
+
+	protected function encodeAttribute($text) {
+	#
+	# Encode text for a double-quoted HTML attribute. This function
+	# is *not* suitable for attributes enclosed in single quotes.
+	#
+		$text = $this->encodeAmpsAndAngles($text);
+		$text = str_replace('"', '&quot;', $text);
+		return $text;
+	}
+	
+	
+	protected function encodeAmpsAndAngles($text) {
+	#
+	# Smart processing for ampersands and angle brackets that need to 
+	# be encoded. Valid character entities are left alone unless the
+	# no-entities mode is set.
+	#
+		if ($this->no_entities) {
+			$text = str_replace('&', '&amp;', $text);
+		} else {
+			# Ampersand-encoding based entirely on Nat Irons's Amputator
+			# MT plugin: <http://bumppo.net/projects/amputator/>
+			$text = preg_replace('/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/', 
+								'&amp;', $text);;
+		}
+		# Encode remaining <'s
+		$text = str_replace('<', '&lt;', $text);
+
+		return $text;
+	}
+
+
+	protected function doAutoLinks($text) {
+		$text = preg_replace_callback('{<((https?|ftp|dict):[^\'">\s]+)>}i', 
+			array(&$this, '_doAutoLinks_url_callback'), $text);
+
+		# Email addresses: <address@domain.foo>
+		$text = preg_replace_callback('{
+			<
+			(?:mailto:)?
+			(
+				(?:
+					[-!#$%&\'*+/=?^_`.{|}~\w\x80-\xFF]+
+				|
+					".*?"
+				)
+				\@
+				(?:
+					[-a-z0-9\x80-\xFF]+(\.[-a-z0-9\x80-\xFF]+)*\.[a-z]+
+				|
+					\[[\d.a-fA-F:]+\]	# IPv4 & IPv6
+				)
+			)
+			>
+			}xi',
+			array(&$this, '_doAutoLinks_email_callback'), $text);
+
+		return $text;
+	}
+	protected function _doAutoLinks_url_callback($matches) {
+		$url = $this->encodeAttribute($matches[1]);
+		$link = "<a href=\"$url\">$url</a>";
+		return $this->hashPart($link);
+	}
+	protected function _doAutoLinks_email_callback($matches) {
+		$address = $matches[1];
+		$link = $this->encodeEmailAddress($address);
+		return $this->hashPart($link);
+	}
+
+
+	protected function encodeEmailAddress($addr) {
+	#
+	#	Input: an email address, e.g. "foo@example.com"
+	#
+	#	Output: the email address as a mailto link, with each character
+	#		of the address encoded as either a decimal or hex entity, in
+	#		the hopes of foiling most address harvesting spam bots. E.g.:
+	#
+	#	  <p><a href="&#109;&#x61;&#105;&#x6c;&#116;&#x6f;&#58;&#x66;o&#111;
+	#        &#x40;&#101;&#x78;&#97;&#x6d;&#112;&#x6c;&#101;&#46;&#x63;&#111;
+	#        &#x6d;">&#x66;o&#111;&#x40;&#101;&#x78;&#97;&#x6d;&#112;&#x6c;
+	#        &#101;&#46;&#x63;&#111;&#x6d;</a></p>
+	#
+	#	Based by a filter by Matthew Wickline, posted to BBEdit-Talk.
+	#   With some optimizations by Milian Wolff.
+	#
+		$addr = "mailto:" . $addr;
+		$chars = preg_split('/(?<!^)(?!$)/', $addr);
+		$seed = (int)abs(crc32($addr) / strlen($addr)); # Deterministic seed.
+		
+		foreach ($chars as $key => $char) {
+			$ord = ord($char);
+			# Ignore non-ascii chars.
+			if ($ord < 128) {
+				$r = ($seed * (1 + $key)) % 100; # Pseudo-random function.
+				# roughly 10% raw, 45% hex, 45% dec
+				# '@' *must* be encoded. I insist.
+				if ($r > 90 && $char != '@') /* do nothing */;
+				else if ($r < 45) $chars[$key] = '&#x'.dechex($ord).';';
+				else              $chars[$key] = '&#'.$ord.';';
+			}
+		}
+		
+		$addr = implode('', $chars);
+		$text = implode('', array_slice($chars, 7)); # text without `mailto:`
+		$addr = "<a href=\"$addr\">$text</a>";
+
+		return $addr;
+	}
+
+
+	protected function parseSpan($str) {
+	#
+	# Take the string $str and parse it into tokens, hashing embeded HTML,
+	# escaped characters and handling code spans.
+	#
+		$output = '';
+		
+		$span_re = '{
+				(
+					\\\\'.$this->escape_chars_re.'
+				|
+					(?<![`\\\\])
+					`+						# code span marker
+			'.( $this->no_markup ? '' : '
+				|
+					<!--    .*?     -->		# comment
+				|
+					<\?.*?\?> | <%.*?%>		# processing instruction
+				|
+					<[!$]?[-a-zA-Z0-9:_]+	# regular tags
+					(?>
+						\s
+						(?>[^"\'>]+|"[^"]*"|\'[^\']*\')*
+					)?
+					>
+				|
+					<[-a-zA-Z0-9:_]+\s*/> # xml-style empty tag
+				|
+					</[-a-zA-Z0-9:_]+\s*> # closing tag
+			').'
+				)
+				}xs';
+
+		while (1) {
+			#
+			# Each loop iteration seach for either the next tag, the next 
+			# openning code span marker, or the next escaped character. 
+			# Each token is then passed to handleSpanToken.
+			#
+			$parts = preg_split($span_re, $str, 2, PREG_SPLIT_DELIM_CAPTURE);
+			
+			# Create token from text preceding tag.
+			if ($parts[0] != "") {
+				$output .= $parts[0];
+			}
+			
+			# Check if we reach the end.
+			if (isset($parts[1])) {
+				$output .= $this->handleSpanToken($parts[1], $parts[2]);
+				$str = $parts[2];
+			}
+			else {
+				break;
+			}
+		}
+		
+		return $output;
+	}
+	
+	
+	protected function handleSpanToken($token, &$str) {
+	#
+	# Handle $token provided by parseSpan by determining its nature and 
+	# returning the corresponding value that should replace it.
+	#
+		switch ($token{0}) {
+			case "\\":
+				return $this->hashPart("&#". ord($token{1}). ";");
+			case "`":
+				# Search for end marker in remaining text.
+				if (preg_match('/^(.*?[^`])'.preg_quote($token).'(?!`)(.*)$/sm', 
+					$str, $matches))
+				{
+					$str = $matches[2];
+					$codespan = $this->makeCodeSpan($matches[1]);
+					return $this->hashPart($codespan);
+				}
+				return $token; // return as text since no ending marker found.
+			default:
+				return $this->hashPart($token);
+		}
+	}
+
+
+	protected function outdent($text) {
+	#
+	# Remove one level of line-leading tabs or spaces
+	#
+		return preg_replace('/^(\t|[ ]{1,'.$this->tab_width.'})/m', '', $text);
+	}
+
+
+	# String length function for detab. `_initDetab` will create a function to 
+	# hanlde UTF-8 if the default function does not exist.
+	protected $utf8_strlen = 'mb_strlen';
+	
+	protected function detab($text) {
+	#
+	# Replace tabs with the appropriate amount of space.
+	#
+		# For each line we separate the line in blocks delemited by
+		# tab characters. Then we reconstruct every line by adding the 
+		# appropriate number of space between each blocks.
+		
+		$text = preg_replace_callback('/^.*\t.*$/m',
+			array(&$this, '_detab_callback'), $text);
+
+		return $text;
+	}
+	protected function _detab_callback($matches) {
+		$line = $matches[0];
+		$strlen = $this->utf8_strlen; # strlen function for UTF-8.
+		
+		# Split in blocks.
+		$blocks = explode("\t", $line);
+		# Add each blocks to the line.
+		$line = $blocks[0];
+		unset($blocks[0]); # Do not add first block twice.
+		foreach ($blocks as $block) {
+			# Calculate amount of space, insert spaces, insert block.
+			$amount = $this->tab_width - 
+				$strlen($line, 'UTF-8') % $this->tab_width;
+			$line .= str_repeat(" ", $amount) . $block;
+		}
+		return $line;
+	}
+	protected function _initDetab() {
+	#
+	# Check for the availability of the function in the `utf8_strlen` property
+	# (initially `mb_strlen`). If the function is not available, create a 
+	# function that will loosely count the number of UTF-8 characters with a
+	# regular expression.
+	#
+		if (function_exists($this->utf8_strlen)) return;
+		$this->utf8_strlen = create_function('$text', 'return preg_match_all(
+			"/[\\\\x00-\\\\xBF]|[\\\\xC0-\\\\xFF][\\\\x80-\\\\xBF]*/", 
+			$text, $m);');
+	}
+
+
+	protected function unhash($text) {
+	#
+	# Swap back in all the tags hashed by _HashHTMLBlocks.
+	#
+		return preg_replace_callback('/(.)\x1A[0-9]+\1/', 
+			array(&$this, '_unhash_callback'), $text);
+	}
+	protected function _unhash_callback($matches) {
+		return $this->html_hashes[$matches[0]];
+	}
+
+}
+
+#
+# Temporary Markdown Extra Parser Implementation Class
+#
+# NOTE: DON'T USE THIS CLASS
+# Currently the implementation of of Extra resides here in this temporary class.
+# This makes it easier to propagate the changes between the three different
+# packaging styles of PHP Markdown. When this issue is resolved, this
+# MarkdownExtra_TmpImpl class here will disappear and \Michelf\MarkdownExtra
+# will contain the code. So please use \Michelf\MarkdownExtra and ignore this
+# one.
+#
+
+class MarkdownExtra extends Markdown {
+
+	### Configuration Variables ###
+
+	# Prefix for footnote ids.
+	public $fn_id_prefix = "";
+	
+	# Optional title attribute for footnote links and backlinks.
+	public $fn_link_title = "";
+	public $fn_backlink_title = "";
+	
+	# Optional class attribute for footnote links and backlinks.
+	public $fn_link_class = "footnote-ref";
+	public $fn_backlink_class = "footnote-backref";
+
+	# Class name for table cell alignment (%% replaced left/center/right)
+	# For instance: 'go-%%' becomes 'go-left' or 'go-right' or 'go-center'
+	# If empty, the align attribute is used instead of a class name.
+	public $table_align_class_tmpl = '';
+
+	# Optional class prefix for fenced code block.
+	public $code_class_prefix = "";
+	# Class attribute for code blocks goes on the `code` tag;
+	# setting this to true will put attributes on the `pre` tag instead.
+	public $code_attr_on_pre = false;
+	
+	# Predefined abbreviations.
+	public $predef_abbr = array();
+
+
+	### Parser Implementation ###
+
+	public function __construct() {
+	#
+	# Constructor function. Initialize the parser object.
+	#
+		# Add extra escapable characters before parent constructor 
+		# initialize the table.
+		$this->escape_chars .= ':|';
+		
+		# Insert extra document, block, and span transformations. 
+		# Parent constructor will do the sorting.
+		$this->document_gamut += array(
+			"doFencedCodeBlocks" => 5,
+			"stripFootnotes"     => 15,
+			"stripAbbreviations" => 25,
+			"appendFootnotes"    => 50,
+			);
+		$this->block_gamut += array(
+			"doFencedCodeBlocks" => 5,
+			"doTables"           => 15,
+			"doDefLists"         => 45,
+			);
+		$this->span_gamut += array(
+			"doFootnotes"        => 5,
+			"doAbbreviations"    => 70,
+			);
+		
+		parent::__construct();
+	}
+	
+	
+	# Extra variables used during extra transformations.
+	protected $footnotes = array();
+	protected $footnotes_ordered = array();
+	protected $footnotes_ref_count = array();
+	protected $footnotes_numbers = array();
+	protected $abbr_desciptions = array();
+	protected $abbr_word_re = '';
+	
+	# Give the current footnote number.
+	protected $footnote_counter = 1;
+	
+	
+	protected function setup() {
+	#
+	# Setting up Extra-specific variables.
+	#
+		parent::setup();
+		
+		$this->footnotes = array();
+		$this->footnotes_ordered = array();
+		$this->footnotes_ref_count = array();
+		$this->footnotes_numbers = array();
+		$this->abbr_desciptions = array();
+		$this->abbr_word_re = '';
+		$this->footnote_counter = 1;
+		
+		foreach ($this->predef_abbr as $abbr_word => $abbr_desc) {
+			if ($this->abbr_word_re)
+				$this->abbr_word_re .= '|';
+			$this->abbr_word_re .= preg_quote($abbr_word);
+			$this->abbr_desciptions[$abbr_word] = trim($abbr_desc);
+		}
+	}
+	
+	protected function teardown() {
+	#
+	# Clearing Extra-specific variables.
+	#
+		$this->footnotes = array();
+		$this->footnotes_ordered = array();
+		$this->footnotes_ref_count = array();
+		$this->footnotes_numbers = array();
+		$this->abbr_desciptions = array();
+		$this->abbr_word_re = '';
+		
+		parent::teardown();
+	}
+	
+	
+	### Extra Attribute Parser ###
+
+	# Expression to use to catch attributes (includes the braces)
+	protected $id_class_attr_catch_re = '\{((?:[ ]*[#.][-_:a-zA-Z0-9]+){1,})[ ]*\}';
+	# Expression to use when parsing in a context when no capture is desired
+	protected $id_class_attr_nocatch_re = '\{(?:[ ]*[#.][-_:a-zA-Z0-9]+){1,}[ ]*\}';
+
+	protected function doExtraAttributes($tag_name, $attr) {
+	#
+	# Parse attributes caught by the $this->id_class_attr_catch_re expression
+	# and return the HTML-formatted list of attributes.
+	#
+	# Currently supported attributes are .class and #id.
+	#
+		if (empty($attr)) return "";
+		
+		# Split on components
+		preg_match_all('/[#.][-_:a-zA-Z0-9]+/', $attr, $matches);
+		$elements = $matches[0];
+
+		# handle classes and ids (only first id taken into account)
+		$classes = array();
+		$id = false;
+		foreach ($elements as $element) {
+			if ($element{0} == '.') {
+				$classes[] = substr($element, 1);
+			} else if ($element{0} == '#') {
+				if ($id === false) $id = substr($element, 1);
+			}
+		}
+
+		# compose attributes as string
+		$attr_str = "";
+		if (!empty($id)) {
+			$attr_str .= ' id="'.$id.'"';
+		}
+		if (!empty($classes)) {
+			$attr_str .= ' class="'.implode(" ", $classes).'"';
+		}
+		return $attr_str;
+	}
+
+
+	protected function stripLinkDefinitions($text) {
+	#
+	# Strips link definitions from text, stores the URLs and titles in
+	# hash references.
+	#
+		$less_than_tab = $this->tab_width - 1;
+
+		# Link defs are in the form: ^[id]: url "optional title"
+		$text = preg_replace_callback('{
+							^[ ]{0,'.$less_than_tab.'}\[(.+)\][ ]?:	# id = $1
+							  [ ]*
+							  \n?				# maybe *one* newline
+							  [ ]*
+							(?:
+							  <(.+?)>			# url = $2
+							|
+							  (\S+?)			# url = $3
+							)
+							  [ ]*
+							  \n?				# maybe one newline
+							  [ ]*
+							(?:
+								(?<=\s)			# lookbehind for whitespace
+								["(]
+								(.*?)			# title = $4
+								[")]
+								[ ]*
+							)?	# title is optional
+					(?:[ ]* '.$this->id_class_attr_catch_re.' )?  # $5 = extra id & class attr
+							(?:\n+|\Z)
+			}xm',
+			array(&$this, '_stripLinkDefinitions_callback'),
+			$text);
+		return $text;
+	}
+	protected function _stripLinkDefinitions_callback($matches) {
+		$link_id = strtolower($matches[1]);
+		$url = $matches[2] == '' ? $matches[3] : $matches[2];
+		$this->urls[$link_id] = $url;
+		$this->titles[$link_id] =& $matches[4];
+		$this->ref_attr[$link_id] = $this->doExtraAttributes("", $dummy =& $matches[5]);
+		return ''; # String that will replace the block
+	}
+
+
+	### HTML Block Parser ###
+	
+	# Tags that are always treated as block tags:
+	protected $block_tags_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend|article|section|nav|aside|hgroup|header|footer|figcaption';
+						   
+	# Tags treated as block tags only if the opening tag is alone on its line:
+	protected $context_block_tags_re = 'script|noscript|ins|del|iframe|object|source|track|param|math|svg|canvas|audio|video';
+	
+	# Tags where markdown="1" default to span mode:
+	protected $contain_span_tags_re = 'p|h[1-6]|li|dd|dt|td|th|legend|address';
+	
+	# Tags which must not have their contents modified, no matter where 
+	# they appear:
+	protected $clean_tags_re = 'script|math|svg';
+	
+	# Tags that do not need to be closed.
+	protected $auto_close_tags_re = 'hr|img|param|source|track';
+	
+
+	protected function hashHTMLBlocks($text) {
+	#
+	# Hashify HTML Blocks and "clean tags".
+	#
+	# We only want to do this for block-level HTML tags, such as headers,
+	# lists, and tables. That's because we still want to wrap <p>s around
+	# "paragraphs" that are wrapped in non-block-level tags, such as anchors,
+	# phrase emphasis, and spans. The list of tags we're looking for is
+	# hard-coded.
+	#
+	# This works by calling _HashHTMLBlocks_InMarkdown, which then calls
+	# _HashHTMLBlocks_InHTML when it encounter block tags. When the markdown="1" 
+	# attribute is found within a tag, _HashHTMLBlocks_InHTML calls back
+	#  _HashHTMLBlocks_InMarkdown to handle the Markdown syntax within the tag.
+	# These two functions are calling each other. It's recursive!
+	#
+		if ($this->no_markup)  return $text;
+
+		#
+		# Call the HTML-in-Markdown hasher.
+		#
+		list($text, ) = $this->_hashHTMLBlocks_inMarkdown($text);
+		
+		return $text;
+	}
+	protected function _hashHTMLBlocks_inMarkdown($text, $indent = 0,
+										$enclosing_tag_re = '', $span = false)
+	{
+	#
+	# Parse markdown text, calling _HashHTMLBlocks_InHTML for block tags.
+	#
+	# *   $indent is the number of space to be ignored when checking for code 
+	#     blocks. This is important because if we don't take the indent into 
+	#     account, something like this (which looks right) won't work as expected:
+	#
+	#     <div>
+	#         <div markdown="1">
+	#         Hello World.  <-- Is this a Markdown code block or text?
+	#         </div>  <-- Is this a Markdown code block or a real tag?
+	#     <div>
+	#
+	#     If you don't like this, just don't indent the tag on which
+	#     you apply the markdown="1" attribute.
+	#
+	# *   If $enclosing_tag_re is not empty, stops at the first unmatched closing 
+	#     tag with that name. Nested tags supported.
+	#
+	# *   If $span is true, text inside must treated as span. So any double 
+	#     newline will be replaced by a single newline so that it does not create 
+	#     paragraphs.
+	#
+	# Returns an array of that form: ( processed text , remaining text )
+	#
+		if ($text === '') return array('', '');
+
+		# Regex to check for the presense of newlines around a block tag.
+		$newline_before_re = '/(?:^\n?|\n\n)*$/';
+		$newline_after_re = 
+			'{
+				^						# Start of text following the tag.
+				(?>[ ]*<!--.*?-->)?		# Optional comment.
+				[ ]*\n					# Must be followed by newline.
+			}xs';
+		
+		# Regex to match any tag.
+		$block_tag_re =
+			'{
+				(					# $2: Capture whole tag.
+					</?					# Any opening or closing tag.
+						(?>				# Tag name.
+							'.$this->block_tags_re.'			|
+							'.$this->context_block_tags_re.'	|
+							'.$this->clean_tags_re.'        	|
+							(?!\s)'.$enclosing_tag_re.'
+						)
+						(?:
+							(?=[\s"\'/a-zA-Z0-9])	# Allowed characters after tag name.
+							(?>
+								".*?"		|	# Double quotes (can contain `>`)
+								\'.*?\'   	|	# Single quotes (can contain `>`)
+								.+?				# Anything but quotes and `>`.
+							)*?
+						)?
+					>					# End of tag.
+				|
+					<!--    .*?     -->	# HTML Comment
+				|
+					<\?.*?\?> | <%.*?%>	# Processing instruction
+				|
+					<!\[CDATA\[.*?\]\]>	# CData Block
+				|
+					# Code span marker
+					`+
+				'. ( !$span ? ' # If not in span.
+				|
+					# Indented code block
+					(?: ^[ ]*\n | ^ | \n[ ]*\n )
+					[ ]{'.($indent+4).'}[^\n]* \n
+					(?>
+						(?: [ ]{'.($indent+4).'}[^\n]* | [ ]* ) \n
+					)*
+				|
+					# Fenced code block marker
+					(?<= ^ | \n )
+					[ ]{0,'.($indent+3).'}~{3,}
+									[ ]*
+					(?:
+					\.?[-_:a-zA-Z0-9]+ # standalone class name
+					|
+						'.$this->id_class_attr_nocatch_re.' # extra attributes
+					)?
+					[ ]*
+					\n
+				' : '' ). ' # End (if not is span).
+				)
+			}xs';
+
+		
+		$depth = 0;		# Current depth inside the tag tree.
+		$parsed = "";	# Parsed text that will be returned.
+
+		#
+		# Loop through every tag until we find the closing tag of the parent
+		# or loop until reaching the end of text if no parent tag specified.
+		#
+		do {
+			#
+			# Split the text using the first $tag_match pattern found.
+			# Text before  pattern will be first in the array, text after
+			# pattern will be at the end, and between will be any catches made 
+			# by the pattern.
+			#
+			$parts = preg_split($block_tag_re, $text, 2, 
+								PREG_SPLIT_DELIM_CAPTURE);
+			
+			# If in Markdown span mode, add a empty-string span-level hash 
+			# after each newline to prevent triggering any block element.
+			if ($span) {
+				$void = $this->hashPart("", ':');
+				$newline = "$void\n";
+				$parts[0] = $void . str_replace("\n", $newline, $parts[0]) . $void;
+			}
+			
+			$parsed .= $parts[0]; # Text before current tag.
+			
+			# If end of $text has been reached. Stop loop.
+			if (count($parts) < 3) {
+				$text = "";
+				break;
+			}
+			
+			$tag  = $parts[1]; # Tag to handle.
+			$text = $parts[2]; # Remaining text after current tag.
+			$tag_re = preg_quote($tag); # For use in a regular expression.
+			
+			#
+			# Check for: Code span marker
+			#
+			if ($tag{0} == "`") {
+				# Find corresponding end marker.
+				$tag_re = preg_quote($tag);
+				if (preg_match('{^(?>.+?|\n(?!\n))*?(?<!`)'.$tag_re.'(?!`)}',
+					$text, $matches))
+				{
+					# End marker found: pass text unchanged until marker.
+					$parsed .= $tag . $matches[0];
+					$text = substr($text, strlen($matches[0]));
+				}
+				else {
+					# Unmatched marker: just skip it.
+					$parsed .= $tag;
+				}
+			}
+			#
+			# Check for: Fenced code block marker.
+			#
+			else if (preg_match('{^\n?([ ]{0,'.($indent+3).'})(~+)}', $tag, $capture)) {
+				# Fenced code block marker: find matching end marker.
+				$fence_indent = strlen($capture[1]); # use captured indent in re
+				$fence_re = $capture[2]; # use captured fence in re
+				if (preg_match('{^(?>.*\n)*?[ ]{'.($fence_indent).'}'.$fence_re.'[ ]*(?:\n|$)}', $text,
+					$matches)) 
+				{
+					# End marker found: pass text unchanged until marker.
+					$parsed .= $tag . $matches[0];
+					$text = substr($text, strlen($matches[0]));
+				}
+				else {
+					# No end marker: just skip it.
+					$parsed .= $tag;
+				}
+			}
+			#
+			# Check for: Indented code block.
+			#
+			else if ($tag{0} == "\n" || $tag{0} == " ") {
+				# Indented code block: pass it unchanged, will be handled 
+				# later.
+				$parsed .= $tag;
+			}
+			#
+			# Check for: Opening Block level tag or
+			#            Opening Context Block tag (like ins and del) 
+			#               used as a block tag (tag is alone on it's line).
+			#
+			else if (preg_match('{^<(?:'.$this->block_tags_re.')\b}', $tag) ||
+				(	preg_match('{^<(?:'.$this->context_block_tags_re.')\b}', $tag) &&
+					preg_match($newline_before_re, $parsed) &&
+					preg_match($newline_after_re, $text)	)
+				)
+			{
+				# Need to parse tag and following text using the HTML parser.
+				list($block_text, $text) = 
+					$this->_hashHTMLBlocks_inHTML($tag . $text, "hashBlock", true);
+				
+				# Make sure it stays outside of any paragraph by adding newlines.
+				$parsed .= "\n\n$block_text\n\n";
+			}
+			#
+			# Check for: Clean tag (like script, math)
+			#            HTML Comments, processing instructions.
+			#
+			else if (preg_match('{^<(?:'.$this->clean_tags_re.')\b}', $tag) ||
+				$tag{1} == '!' || $tag{1} == '?')
+			{
+				# Need to parse tag and following text using the HTML parser.
+				# (don't check for markdown attribute)
+				list($block_text, $text) = 
+					$this->_hashHTMLBlocks_inHTML($tag . $text, "hashClean", false);
+				
+				$parsed .= $block_text;
+			}
+			#
+			# Check for: Tag with same name as enclosing tag.
+			#
+			else if ($enclosing_tag_re !== '' &&
+				# Same name as enclosing tag.
+				preg_match('{^</?(?:'.$enclosing_tag_re.')\b}', $tag))
+			{
+				#
+				# Increase/decrease nested tag count.
+				#
+				if ($tag{1} == '/')						$depth--;
+				else if ($tag{strlen($tag)-2} != '/')	$depth++;
+
+				if ($depth < 0) {
+					#
+					# Going out of parent element. Clean up and break so we
+					# return to the calling function.
+					#
+					$text = $tag . $text;
+					break;
+				}
+				
+				$parsed .= $tag;
+			}
+			else {
+				$parsed .= $tag;
+			}
+		} while ($depth >= 0);
+		
+		return array($parsed, $text);
+	}
+	protected function _hashHTMLBlocks_inHTML($text, $hash_method, $md_attr) {
+	#
+	# Parse HTML, calling _HashHTMLBlocks_InMarkdown for block tags.
+	#
+	# *   Calls $hash_method to convert any blocks.
+	# *   Stops when the first opening tag closes.
+	# *   $md_attr indicate if the use of the `markdown="1"` attribute is allowed.
+	#     (it is not inside clean tags)
+	#
+	# Returns an array of that form: ( processed text , remaining text )
+	#
+		if ($text === '') return array('', '');
+		
+		# Regex to match `markdown` attribute inside of a tag.
+		$markdown_attr_re = '
+			{
+				\s*			# Eat whitespace before the `markdown` attribute
+				markdown
+				\s*=\s*
+				(?>
+					(["\'])		# $1: quote delimiter		
+					(.*?)		# $2: attribute value
+					\1			# matching delimiter	
+				|
+					([^\s>]*)	# $3: unquoted attribute value
+				)
+				()				# $4: make $3 always defined (avoid warnings)
+			}xs';
+		
+		# Regex to match any tag.
+		$tag_re = '{
+				(					# $2: Capture whole tag.
+					</?					# Any opening or closing tag.
+						[\w:$]+			# Tag name.
+						(?:
+							(?=[\s"\'/a-zA-Z0-9])	# Allowed characters after tag name.
+							(?>
+								".*?"		|	# Double quotes (can contain `>`)
+								\'.*?\'   	|	# Single quotes (can contain `>`)
+								.+?				# Anything but quotes and `>`.
+							)*?
+						)?
+					>					# End of tag.
+				|
+					<!--    .*?     -->	# HTML Comment
+				|
+					<\?.*?\?> | <%.*?%>	# Processing instruction
+				|
+					<!\[CDATA\[.*?\]\]>	# CData Block
+				)
+			}xs';
+		
+		$original_text = $text;		# Save original text in case of faliure.
+		
+		$depth		= 0;	# Current depth inside the tag tree.
+		$block_text	= "";	# Temporary text holder for current text.
+		$parsed		= "";	# Parsed text that will be returned.
+
+		#
+		# Get the name of the starting tag.
+		# (This pattern makes $base_tag_name_re safe without quoting.)
+		#
+		if (preg_match('/^<([\w:$]*)\b/', $text, $matches))
+			$base_tag_name_re = $matches[1];
+
+		#
+		# Loop through every tag until we find the corresponding closing tag.
+		#
+		do {
+			#
+			# Split the text using the first $tag_match pattern found.
+			# Text before  pattern will be first in the array, text after
+			# pattern will be at the end, and between will be any catches made 
+			# by the pattern.
+			#
+			$parts = preg_split($tag_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
+			
+			if (count($parts) < 3) {
+				#
+				# End of $text reached with unbalenced tag(s).
+				# In that case, we return original text unchanged and pass the
+				# first character as filtered to prevent an infinite loop in the 
+				# parent function.
+				#
+				return array($original_text{0}, substr($original_text, 1));
+			}
+			
+			$block_text .= $parts[0]; # Text before current tag.
+			$tag         = $parts[1]; # Tag to handle.
+			$text        = $parts[2]; # Remaining text after current tag.
+			
+			#
+			# Check for: Auto-close tag (like <hr/>)
+			#			 Comments and Processing Instructions.
+			#
+			if (preg_match('{^</?(?:'.$this->auto_close_tags_re.')\b}', $tag) ||
+				$tag{1} == '!' || $tag{1} == '?')
+			{
+				# Just add the tag to the block as if it was text.
+				$block_text .= $tag;
+			}
+			else {
+				#
+				# Increase/decrease nested tag count. Only do so if
+				# the tag's name match base tag's.
+				#
+				if (preg_match('{^</?'.$base_tag_name_re.'\b}', $tag)) {
+					if ($tag{1} == '/')						$depth--;
+					else if ($tag{strlen($tag)-2} != '/')	$depth++;
+				}
+				
+				#
+				# Check for `markdown="1"` attribute and handle it.
+				#
+				if ($md_attr && 
+					preg_match($markdown_attr_re, $tag, $attr_m) &&
+					preg_match('/^1|block|span$/', $attr_m[2] . $attr_m[3]))
+				{
+					# Remove `markdown` attribute from opening tag.
+					$tag = preg_replace($markdown_attr_re, '', $tag);
+					
+					# Check if text inside this tag must be parsed in span mode.
+					$this->mode = $attr_m[2] . $attr_m[3];
+					$span_mode = $this->mode == 'span' || $this->mode != 'block' &&
+						preg_match('{^<(?:'.$this->contain_span_tags_re.')\b}', $tag);
+					
+					# Calculate indent before tag.
+					if (preg_match('/(?:^|\n)( *?)(?! ).*?$/', $block_text, $matches)) {
+						$strlen = $this->utf8_strlen;
+						$indent = $strlen($matches[1], 'UTF-8');
+					} else {
+						$indent = 0;
+					}
+					
+					# End preceding block with this tag.
+					$block_text .= $tag;
+					$parsed .= $this->$hash_method($block_text);
+					
+					# Get enclosing tag name for the ParseMarkdown function.
+					# (This pattern makes $tag_name_re safe without quoting.)
+					preg_match('/^<([\w:$]*)\b/', $tag, $matches);
+					$tag_name_re = $matches[1];
+					
+					# Parse the content using the HTML-in-Markdown parser.
+					list ($block_text, $text)
+						= $this->_hashHTMLBlocks_inMarkdown($text, $indent, 
+							$tag_name_re, $span_mode);
+					
+					# Outdent markdown text.
+					if ($indent > 0) {
+						$block_text = preg_replace("/^[ ]{1,$indent}/m", "", 
+													$block_text);
+					}
+					
+					# Append tag content to parsed text.
+					if (!$span_mode)	$parsed .= "\n\n$block_text\n\n";
+					else				$parsed .= "$block_text";
+					
+					# Start over with a new block.
+					$block_text = "";
+				}
+				else $block_text .= $tag;
+			}
+			
+		} while ($depth > 0);
+		
+		#
+		# Hash last block text that wasn't processed inside the loop.
+		#
+		$parsed .= $this->$hash_method($block_text);
+		
+		return array($parsed, $text);
+	}
+
+
+	protected function hashClean($text) {
+	#
+	# Called whenever a tag must be hashed when a function inserts a "clean" tag
+	# in $text, it passes through this function and is automaticaly escaped, 
+	# blocking invalid nested overlap.
+	#
+		return $this->hashPart($text, 'C');
+	}
+
+
+	protected function doAnchors($text) {
+	#
+	# Turn Markdown link shortcuts into XHTML <a> tags.
+	#
+		if ($this->in_anchor) return $text;
+		$this->in_anchor = true;
+		
+		#
+		# First, handle reference-style links: [link text] [id]
+		#
+		$text = preg_replace_callback('{
+			(					# wrap whole match in $1
+			  \[
+				('.$this->nested_brackets_re.')	# link text = $2
+			  \]
+
+			  [ ]?				# one optional space
+			  (?:\n[ ]*)?		# one optional newline followed by spaces
+
+			  \[
+				(.*?)		# id = $3
+			  \]
+			)
+			}xs',
+			array(&$this, '_doAnchors_reference_callback'), $text);
+
+		#
+		# Next, inline-style links: [link text](url "optional title")
+		#
+		$text = preg_replace_callback('{
+			(				# wrap whole match in $1
+			  \[
+				('.$this->nested_brackets_re.')	# link text = $2
+			  \]
+			  \(			# literal paren
+				[ \n]*
+				(?:
+					<(.+?)>	# href = $3
+				|
+					('.$this->nested_url_parenthesis_re.')	# href = $4
+				)
+				[ \n]*
+				(			# $5
+				  ([\'"])	# quote char = $6
+				  (.*?)		# Title = $7
+				  \6		# matching quote
+				  [ \n]*	# ignore any spaces/tabs between closing quote and )
+				)?			# title is optional
+			  \)
+			  (?:[ ]? '.$this->id_class_attr_catch_re.' )?	 # $8 = id/class attributes
+			)
+			}xs',
+			array(&$this, '_doAnchors_inline_callback'), $text);
+
+		#
+		# Last, handle reference-style shortcuts: [link text]
+		# These must come last in case you've also got [link text][1]
+		# or [link text](/foo)
+		#
+		$text = preg_replace_callback('{
+			(					# wrap whole match in $1
+			  \[
+				([^\[\]]+)		# link text = $2; can\'t contain [ or ]
+			  \]
+			)
+			}xs',
+			array(&$this, '_doAnchors_reference_callback'), $text);
+
+		$this->in_anchor = false;
+		return $text;
+	}
+	protected function _doAnchors_reference_callback($matches) {
+		$whole_match =  $matches[1];
+		$link_text   =  $matches[2];
+		$link_id     =& $matches[3];
+
+		if ($link_id == "") {
+			# for shortcut links like [this][] or [this].
+			$link_id = $link_text;
+		}
+		
+		# lower-case and turn embedded newlines into spaces
+		$link_id = strtolower($link_id);
+		$link_id = preg_replace('{[ ]?\n}', ' ', $link_id);
+
+		if (isset($this->urls[$link_id])) {
+			$url = $this->urls[$link_id];
+			$url = $this->encodeAttribute($url);
+			
+			$result = "<a href=\"$url\"";
+			if ( isset( $this->titles[$link_id] ) ) {
+				$title = $this->titles[$link_id];
+				$title = $this->encodeAttribute($title);
+				$result .=  " title=\"$title\"";
+			}
+			if (isset($this->ref_attr[$link_id]))
+				$result .= $this->ref_attr[$link_id];
+		
+			$link_text = $this->runSpanGamut($link_text);
+			$result .= ">$link_text</a>";
+			$result = $this->hashPart($result);
+		}
+		else {
+			$result = $whole_match;
+		}
+		return $result;
+	}
+	protected function _doAnchors_inline_callback($matches) {
+		$whole_match	=  $matches[1];
+		$link_text		=  $this->runSpanGamut($matches[2]);
+		$url			=  $matches[3] == '' ? $matches[4] : $matches[3];
+		$title			=& $matches[7];
+		$attr  = $this->doExtraAttributes("a", $dummy =& $matches[8]);
+
+
+		$url = $this->encodeAttribute($url);
+
+		$result = "<a href=\"$url\"";
+		if (isset($title)) {
+			$title = $this->encodeAttribute($title);
+			$result .=  " title=\"$title\"";
+		}
+		$result .= $attr;
+		
+		$link_text = $this->runSpanGamut($link_text);
+		$result .= ">$link_text</a>";
+
+		return $this->hashPart($result);
+	}
+
+
+	protected function doImages($text) {
+	#
+	# Turn Markdown image shortcuts into <img> tags.
+	#
+		#
+		# First, handle reference-style labeled images: ![alt text][id]
+		#
+		$text = preg_replace_callback('{
+			(				# wrap whole match in $1
+			  !\[
+				('.$this->nested_brackets_re.')		# alt text = $2
+			  \]
+
+			  [ ]?				# one optional space
+			  (?:\n[ ]*)?		# one optional newline followed by spaces
+
+			  \[
+				(.*?)		# id = $3
+			  \]
+
+			)
+			}xs', 
+			array(&$this, '_doImages_reference_callback'), $text);
+
+		#
+		# Next, handle inline images:  ![alt text](url "optional title")
+		# Don't forget: encode * and _
+		#
+		$text = preg_replace_callback('{
+			(				# wrap whole match in $1
+			  !\[
+				('.$this->nested_brackets_re.')		# alt text = $2
+			  \]
+			  \s?			# One optional whitespace character
+			  \(			# literal paren
+				[ \n]*
+				(?:
+					<(\S*)>	# src url = $3
+				|
+					('.$this->nested_url_parenthesis_re.')	# src url = $4
+				)
+				[ \n]*
+				(			# $5
+				  ([\'"])	# quote char = $6
+				  (.*?)		# title = $7
+				  \6		# matching quote
+				  [ \n]*
+				)?			# title is optional
+			  \)
+			  (?:[ ]? '.$this->id_class_attr_catch_re.' )?	 # $8 = id/class attributes
+			)
+			}xs',
+			array(&$this, '_doImages_inline_callback'), $text);
+
+		return $text;
+	}
+	protected function _doImages_reference_callback($matches) {
+		$whole_match = $matches[1];
+		$alt_text    = $matches[2];
+		$link_id     = strtolower($matches[3]);
+
+		if ($link_id == "") {
+			$link_id = strtolower($alt_text); # for shortcut links like ![this][].
+		}
+
+		$alt_text = $this->encodeAttribute($alt_text);
+		if (isset($this->urls[$link_id])) {
+			$url = $this->encodeAttribute($this->urls[$link_id]);
+			$result = "<img src=\"$url\" alt=\"$alt_text\"";
+			if (isset($this->titles[$link_id])) {
+				$title = $this->titles[$link_id];
+				$title = $this->encodeAttribute($title);
+				$result .=  " title=\"$title\"";
+			}
+			if (isset($this->ref_attr[$link_id]))
+				$result .= $this->ref_attr[$link_id];
+			$result .= $this->empty_element_suffix;
+			$result = $this->hashPart($result);
+		}
+		else {
+			# If there's no such link ID, leave intact:
+			$result = $whole_match;
+		}
+
+		return $result;
+	}
+	protected function _doImages_inline_callback($matches) {
+		$whole_match	= $matches[1];
+		$alt_text		= $matches[2];
+		$url			= $matches[3] == '' ? $matches[4] : $matches[3];
+		$title			=& $matches[7];
+		$attr  = $this->doExtraAttributes("img", $dummy =& $matches[8]);
+
+		$alt_text = $this->encodeAttribute($alt_text);
+		$url = $this->encodeAttribute($url);
+		$result = "<img src=\"$url\" alt=\"$alt_text\"";
+		if (isset($title)) {
+			$title = $this->encodeAttribute($title);
+			$result .=  " title=\"$title\""; # $title already quoted
+		}
+		$result .= $attr;
+		$result .= $this->empty_element_suffix;
+
+		return $this->hashPart($result);
+	}
+
+
+	protected function doHeaders($text) {
+	#
+	# Redefined to add id and class attribute support.
+	#
+		# Setext-style headers:
+		#	  Header 1  {#header1}
+		#	  ========
+		#  
+		#	  Header 2  {#header2 .class1 .class2}
+		#	  --------
+		#
+		$text = preg_replace_callback(
+			'{
+				(^.+?)								# $1: Header text
+				(?:[ ]+ '.$this->id_class_attr_catch_re.' )?	 # $3 = id/class attributes
+				[ ]*\n(=+|-+)[ ]*\n+				# $3: Header footer
+			}mx',
+			array(&$this, '_doHeaders_callback_setext'), $text);
+
+		# atx-style headers:
+		#	# Header 1        {#header1}
+		#	## Header 2       {#header2}
+		#	## Header 2 with closing hashes ##  {#header3.class1.class2}
+		#	...
+		#	###### Header 6   {.class2}
+		#
+		$text = preg_replace_callback('{
+				^(\#{1,6})	# $1 = string of #\'s
+				[ ]*
+				(.+?)		# $2 = Header text
+				[ ]*
+				\#*			# optional closing #\'s (not counted)
+				(?:[ ]+ '.$this->id_class_attr_catch_re.' )?	 # $3 = id/class attributes
+				[ ]*
+				\n+
+			}xm',
+			array(&$this, '_doHeaders_callback_atx'), $text);
+
+		return $text;
+	}
+	protected function _doHeaders_callback_setext($matches) {
+		if ($matches[3] == '-' && preg_match('{^- }', $matches[1]))
+			return $matches[0];
+		$level = $matches[3]{0} == '=' ? 1 : 2;
+		$attr  = $this->doExtraAttributes("h$level", $dummy =& $matches[2]);
+		$block = "<h$level$attr>".$this->runSpanGamut($matches[1])."</h$level>";
+		return "\n" . $this->hashBlock($block) . "\n\n";
+	}
+	protected function _doHeaders_callback_atx($matches) {
+		$level = strlen($matches[1]);
+		$attr  = $this->doExtraAttributes("h$level", $dummy =& $matches[3]);
+		$block = "<h$level$attr>".$this->runSpanGamut($matches[2])."</h$level>";
+		return "\n" . $this->hashBlock($block) . "\n\n";
+	}
+
+
+	protected function doTables($text) {
+	#
+	# Form HTML tables.
+	#
+		$less_than_tab = $this->tab_width - 1;
+		#
+		# Find tables with leading pipe.
+		#
+		#	| Header 1 | Header 2
+		#	| -------- | --------
+		#	| Cell 1   | Cell 2
+		#	| Cell 3   | Cell 4
+		#
+		$text = preg_replace_callback('
+			{
+				^							# Start of a line
+				[ ]{0,'.$less_than_tab.'}	# Allowed whitespace.
+				[|]							# Optional leading pipe (present)
+				(.+) \n						# $1: Header row (at least one pipe)
+				
+				[ ]{0,'.$less_than_tab.'}	# Allowed whitespace.
+				[|] ([ ]*[-:]+[-| :]*) \n	# $2: Header underline
+				
+				(							# $3: Cells
+					(?>
+						[ ]*				# Allowed whitespace.
+						[|] .* \n			# Row content.
+					)*
+				)
+				(?=\n|\Z)					# Stop at final double newline.
+			}xm',
+			array(&$this, '_doTable_leadingPipe_callback'), $text);
+		
+		#
+		# Find tables without leading pipe.
+		#
+		#	Header 1 | Header 2
+		#	-------- | --------
+		#	Cell 1   | Cell 2
+		#	Cell 3   | Cell 4
+		#
+		$text = preg_replace_callback('
+			{
+				^							# Start of a line
+				[ ]{0,'.$less_than_tab.'}	# Allowed whitespace.
+				(\S.*[|].*) \n				# $1: Header row (at least one pipe)
+				
+				[ ]{0,'.$less_than_tab.'}	# Allowed whitespace.
+				([-:]+[ ]*[|][-| :]*) \n	# $2: Header underline
+				
+				(							# $3: Cells
+					(?>
+						.* [|] .* \n		# Row content
+					)*
+				)
+				(?=\n|\Z)					# Stop at final double newline.
+			}xm',
+			array(&$this, '_DoTable_callback'), $text);
+
+		return $text;
+	}
+	protected function _doTable_leadingPipe_callback($matches) {
+		$head		= $matches[1];
+		$underline	= $matches[2];
+		$content	= $matches[3];
+		
+		# Remove leading pipe for each row.
+		$content	= preg_replace('/^ *[|]/m', '', $content);
+		
+		return $this->_doTable_callback(array($matches[0], $head, $underline, $content));
+	}
+	protected function _doTable_makeAlignAttr($alignname)
+	{
+		if (empty($this->table_align_class_tmpl))
+			return " align=\"$alignname\"";
+
+		$classname = str_replace('%%', $alignname, $this->table_align_class_tmpl);
+		return " class=\"$classname\"";
+	}
+	protected function _doTable_callback($matches) {
+		$head		= $matches[1];
+		$underline	= $matches[2];
+		$content	= $matches[3];
+
+		# Remove any tailing pipes for each line.
+		$head		= preg_replace('/[|] *$/m', '', $head);
+		$underline	= preg_replace('/[|] *$/m', '', $underline);
+		$content	= preg_replace('/[|] *$/m', '', $content);
+		
+		# Reading alignement from header underline.
+		$separators	= preg_split('/ *[|] */', $underline);
+		foreach ($separators as $n => $s) {
+			if (preg_match('/^ *-+: *$/', $s))
+				$attr[$n] = $this->_doTable_makeAlignAttr('right');
+			else if (preg_match('/^ *:-+: *$/', $s))
+				$attr[$n] = $this->_doTable_makeAlignAttr('center');
+			else if (preg_match('/^ *:-+ *$/', $s))
+				$attr[$n] = $this->_doTable_makeAlignAttr('left');
+			else
+				$attr[$n] = '';
+		}
+		
+		# Parsing span elements, including code spans, character escapes, 
+		# and inline HTML tags, so that pipes inside those gets ignored.
+		$head		= $this->parseSpan($head);
+		$headers	= preg_split('/ *[|] */', $head);
+		$col_count	= count($headers);
+		$attr       = array_pad($attr, $col_count, '');
+		
+		# Write column headers.
+		$text = "<table>\n";
+		$text .= "<thead>\n";
+		$text .= "<tr>\n";
+		foreach ($headers as $n => $header)
+			$text .= "  <th$attr[$n]>".$this->runSpanGamut(trim($header))."</th>\n";
+		$text .= "</tr>\n";
+		$text .= "</thead>\n";
+		
+		# Split content by row.
+		$rows = explode("\n", trim($content, "\n"));
+		
+		$text .= "<tbody>\n";
+		foreach ($rows as $row) {
+			# Parsing span elements, including code spans, character escapes, 
+			# and inline HTML tags, so that pipes inside those gets ignored.
+			$row = $this->parseSpan($row);
+			
+			# Split row by cell.
+			$row_cells = preg_split('/ *[|] */', $row, $col_count);
+			$row_cells = array_pad($row_cells, $col_count, '');
+			
+			$text .= "<tr>\n";
+			foreach ($row_cells as $n => $cell)
+				$text .= "  <td$attr[$n]>".$this->runSpanGamut(trim($cell))."</td>\n";
+			$text .= "</tr>\n";
+		}
+		$text .= "</tbody>\n";
+		$text .= "</table>";
+		
+		return $this->hashBlock($text) . "\n";
+	}
+
+	
+	protected function doDefLists($text) {
+	#
+	# Form HTML definition lists.
+	#
+		$less_than_tab = $this->tab_width - 1;
+
+		# Re-usable pattern to match any entire dl list:
+		$whole_list_re = '(?>
+			(								# $1 = whole list
+			  (								# $2
+				[ ]{0,'.$less_than_tab.'}
+				((?>.*\S.*\n)+)				# $3 = defined term
+				\n?
+				[ ]{0,'.$less_than_tab.'}:[ ]+ # colon starting definition
+			  )
+			  (?s:.+?)
+			  (								# $4
+				  \z
+				|
+				  \n{2,}
+				  (?=\S)
+				  (?!						# Negative lookahead for another term
+					[ ]{0,'.$less_than_tab.'}
+					(?: \S.*\n )+?			# defined term
+					\n?
+					[ ]{0,'.$less_than_tab.'}:[ ]+ # colon starting definition
+				  )
+				  (?!						# Negative lookahead for another definition
+					[ ]{0,'.$less_than_tab.'}:[ ]+ # colon starting definition
+				  )
+			  )
+			)
+		)'; // mx
+
+		$text = preg_replace_callback('{
+				(?>\A\n?|(?<=\n\n))
+				'.$whole_list_re.'
+			}mx',
+			array(&$this, '_doDefLists_callback'), $text);
+
+		return $text;
+	}
+	protected function _doDefLists_callback($matches) {
+		# Re-usable patterns to match list item bullets and number markers:
+		$list = $matches[1];
+		
+		# Turn double returns into triple returns, so that we can make a
+		# paragraph for the last item in a list, if necessary:
+		$result = trim($this->processDefListItems($list));
+		$result = "<dl>\n" . $result . "\n</dl>";
+		return $this->hashBlock($result) . "\n\n";
+	}
+
+
+	protected function processDefListItems($list_str) {
+	#
+	#	Process the contents of a single definition list, splitting it
+	#	into individual term and definition list items.
+	#
+		$less_than_tab = $this->tab_width - 1;
+		
+		# trim trailing blank lines:
+		$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);
+
+		# Process definition terms.
+		$list_str = preg_replace_callback('{
+			(?>\A\n?|\n\n+)					# leading line
+			(								# definition terms = $1
+				[ ]{0,'.$less_than_tab.'}	# leading whitespace
+				(?!\:[ ]|[ ])				# negative lookahead for a definition
+											#   mark (colon) or more whitespace.
+				(?> \S.* \n)+?				# actual term (not whitespace).	
+			)			
+			(?=\n?[ ]{0,3}:[ ])				# lookahead for following line feed 
+											#   with a definition mark.
+			}xm',
+			array(&$this, '_processDefListItems_callback_dt'), $list_str);
+
+		# Process actual definitions.
+		$list_str = preg_replace_callback('{
+			\n(\n+)?						# leading line = $1
+			(								# marker space = $2
+				[ ]{0,'.$less_than_tab.'}	# whitespace before colon
+				\:[ ]+						# definition mark (colon)
+			)
+			((?s:.+?))						# definition text = $3
+			(?= \n+ 						# stop at next definition mark,
+				(?:							# next term or end of text
+					[ ]{0,'.$less_than_tab.'} \:[ ]	|
+					<dt> | \z
+				)						
+			)					
+			}xm',
+			array(&$this, '_processDefListItems_callback_dd'), $list_str);
+
+		return $list_str;
+	}
+	protected function _processDefListItems_callback_dt($matches) {
+		$terms = explode("\n", trim($matches[1]));
+		$text = '';
+		foreach ($terms as $term) {
+			$term = $this->runSpanGamut(trim($term));
+			$text .= "\n<dt>" . $term . "</dt>";
+		}
+		return $text . "\n";
+	}
+	protected function _processDefListItems_callback_dd($matches) {
+		$leading_line	= $matches[1];
+		$marker_space	= $matches[2];
+		$def			= $matches[3];
+
+		if ($leading_line || preg_match('/\n{2,}/', $def)) {
+			# Replace marker with the appropriate whitespace indentation
+			$def = str_repeat(' ', strlen($marker_space)) . $def;
+			$def = $this->runBlockGamut($this->outdent($def . "\n\n"));
+			$def = "\n". $def ."\n";
+		}
+		else {
+			$def = rtrim($def);
+			$def = $this->runSpanGamut($this->outdent($def));
+		}
+
+		return "\n<dd>" . $def . "</dd>\n";
+	}
+
+
+	protected function doFencedCodeBlocks($text) {
+	#
+	# Adding the fenced code block syntax to regular Markdown:
+	#
+	# ~~~
+	# Code block
+	# ~~~
+	#
+		$less_than_tab = $this->tab_width;
+		
+		$text = preg_replace_callback('{
+				(?:\n|\A)
+				# 1: Opening marker
+				(
+					~{3,} # Marker: three tilde or more.
+				)
+				[ ]*
+				(?:
+					\.?([-_:a-zA-Z0-9]+) # 2: standalone class name
+				|
+					'.$this->id_class_attr_catch_re.' # 3: Extra attributes
+				)?
+				[ ]* \n # Whitespace and newline following marker.
+				
+				# 4: Content
+				(
+					(?>
+						(?!\1 [ ]* \n)	# Not a closing marker.
+						.*\n+
+					)+
+				)
+				
+				# Closing marker.
+				\1 [ ]* \n
+			}xm',
+			array(&$this, '_doFencedCodeBlocks_callback'), $text);
+
+		return $text;
+	}
+	protected function _doFencedCodeBlocks_callback($matches) {
+		$classname =& $matches[2];
+		$attrs     =& $matches[3];
+		$codeblock = $matches[4];
+		$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
+		$codeblock = preg_replace_callback('/^\n+/',
+			array(&$this, '_doFencedCodeBlocks_newlines'), $codeblock);
+
+		if ($classname != "") {
+			if ($classname{0} == '.')
+				$classname = substr($classname, 1);
+			$attr_str = ' class="'.$this->code_class_prefix.$classname.'"';
+		} else {
+			$attr_str = $this->doExtraAttributes($this->code_attr_on_pre ? "pre" : "code", $attrs);
+		}
+		$pre_attr_str  = $this->code_attr_on_pre ? $attr_str : '';
+		$code_attr_str = $this->code_attr_on_pre ? '' : $attr_str;
+		$codeblock  = "<pre$pre_attr_str><code$code_attr_str>$codeblock</code></pre>";
+		
+		return "\n\n".$this->hashBlock($codeblock)."\n\n";
+	}
+	protected function _doFencedCodeBlocks_newlines($matches) {
+		return str_repeat("<br$this->empty_element_suffix", 
+			strlen($matches[0]));
+	}
+
+
+	#
+	# Redefining emphasis markers so that emphasis by underscore does not
+	# work in the middle of a word.
+	#
+	protected $em_relist = array(
+		''  => '(?:(?<!\*)\*(?!\*)|(?<![a-zA-Z0-9_])_(?!_))(?=\S|$)(?![\.,:;]\s)',
+		'*' => '(?<=\S|^)(?<!\*)\*(?!\*)',
+		'_' => '(?<=\S|^)(?<!_)_(?![a-zA-Z0-9_])',
+		);
+	protected $strong_relist = array(
+		''   => '(?:(?<!\*)\*\*(?!\*)|(?<![a-zA-Z0-9_])__(?!_))(?=\S|$)(?![\.,:;]\s)',
+		'**' => '(?<=\S|^)(?<!\*)\*\*(?!\*)',
+		'__' => '(?<=\S|^)(?<!_)__(?![a-zA-Z0-9_])',
+		);
+	protected $em_strong_relist = array(
+		''    => '(?:(?<!\*)\*\*\*(?!\*)|(?<![a-zA-Z0-9_])___(?!_))(?=\S|$)(?![\.,:;]\s)',
+		'***' => '(?<=\S|^)(?<!\*)\*\*\*(?!\*)',
+		'___' => '(?<=\S|^)(?<!_)___(?![a-zA-Z0-9_])',
+		);
+
+
+	protected function formParagraphs($text) {
+	#
+	#	Params:
+	#		$text - string to process with html <p> tags
+	#
+		# Strip leading and trailing lines:
+		$text = preg_replace('/\A\n+|\n+\z/', '', $text);
+		
+		$grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);
+
+		#
+		# Wrap <p> tags and unhashify HTML blocks
+		#
+		foreach ($grafs as $key => $value) {
+			$value = trim($this->runSpanGamut($value));
+			
+			# Check if this should be enclosed in a paragraph.
+			# Clean tag hashes & block tag hashes are left alone.
+			$is_p = !preg_match('/^B\x1A[0-9]+B|^C\x1A[0-9]+C$/', $value);
+			
+			if ($is_p) {
+				$value = "<p>$value</p>";
+			}
+			$grafs[$key] = $value;
+		}
+		
+		# Join grafs in one text, then unhash HTML tags. 
+		$text = implode("\n\n", $grafs);
+		
+		# Finish by removing any tag hashes still present in $text.
+		$text = $this->unhash($text);
+		
+		return $text;
+	}
+	
+	
+	### Footnotes
+	
+	protected function stripFootnotes($text) {
+	#
+	# Strips link definitions from text, stores the URLs and titles in
+	# hash references.
+	#
+		$less_than_tab = $this->tab_width - 1;
+
+		# Link defs are in the form: [^id]: url "optional title"
+		$text = preg_replace_callback('{
+			^[ ]{0,'.$less_than_tab.'}\[\^(.+?)\][ ]?:	# note_id = $1
+			  [ ]*
+			  \n?					# maybe *one* newline
+			(						# text = $2 (no blank lines allowed)
+				(?:					
+					.+				# actual text
+				|
+					\n				# newlines but 
+					(?!\[\^.+?\]:\s)# negative lookahead for footnote marker.
+					(?!\n+[ ]{0,3}\S)# ensure line is not blank and followed 
+									# by non-indented content
+				)*
+			)		
+			}xm',
+			array(&$this, '_stripFootnotes_callback'),
+			$text);
+		return $text;
+	}
+	protected function _stripFootnotes_callback($matches) {
+		$note_id = $this->fn_id_prefix . $matches[1];
+		$this->footnotes[$note_id] = $this->outdent($matches[2]);
+		return ''; # String that will replace the block
+	}
+
+
+	protected function doFootnotes($text) {
+	#
+	# Replace footnote references in $text [^id] with a special text-token 
+	# which will be replaced by the actual footnote marker in appendFootnotes.
+	#
+		if (!$this->in_anchor) {
+			$text = preg_replace('{\[\^(.+?)\]}', "F\x1Afn:\\1\x1A:", $text);
+		}
+		return $text;
+	}
+
+	
+	protected function appendFootnotes($text) {
+	#
+	# Append footnote list to text.
+	#
+		$text = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}', 
+			array(&$this, '_appendFootnotes_callback'), $text);
+	
+		if (!empty($this->footnotes_ordered)) {
+			$text .= "\n\n";
+			$text .= "<div class=\"footnotes\">\n";
+			$text .= "<hr". $this->empty_element_suffix ."\n";
+			$text .= "<ol>\n\n";
+			
+			$attr = " rev=\"footnote\"";
+			if ($this->fn_backlink_class != "") {
+				$class = $this->fn_backlink_class;
+				$class = $this->encodeAttribute($class);
+				$attr .= " class=\"$class\"";
+			}
+			if ($this->fn_backlink_title != "") {
+				$title = $this->fn_backlink_title;
+				$title = $this->encodeAttribute($title);
+				$attr .= " title=\"$title\"";
+			}
+			$num = 0;
+			
+			while (!empty($this->footnotes_ordered)) {
+				$footnote = reset($this->footnotes_ordered);
+				$note_id = key($this->footnotes_ordered);
+				unset($this->footnotes_ordered[$note_id]);
+				$ref_count = $this->footnotes_ref_count[$note_id];
+				unset($this->footnotes_ref_count[$note_id]);
+				unset($this->footnotes[$note_id]);
+				
+				$footnote .= "\n"; # Need to append newline before parsing.
+				$footnote = $this->runBlockGamut("$footnote\n");				
+				$footnote = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}', 
+					array(&$this, '_appendFootnotes_callback'), $footnote);
+				
+				$attr = str_replace("%%", ++$num, $attr);
+				$note_id = $this->encodeAttribute($note_id);
+
+				# Prepare backlink, multiple backlinks if multiple references
+				$backlink = "<a href=\"#fnref:$note_id\"$attr>&#8617;</a>";
+				for ($ref_num = 2; $ref_num <= $ref_count; ++$ref_num) {
+					$backlink .= " <a href=\"#fnref$ref_num:$note_id\"$attr>&#8617;</a>";
+				}
+				# Add backlink to last paragraph; create new paragraph if needed.
+				if (preg_match('{</p>$}', $footnote)) {
+					$footnote = substr($footnote, 0, -4) . "&#160;$backlink</p>";
+				} else {
+					$footnote .= "\n\n<p>$backlink</p>";
+				}
+				
+				$text .= "<li id=\"fn:$note_id\">\n";
+				$text .= $footnote . "\n";
+				$text .= "</li>\n\n";
+			}
+			
+			$text .= "</ol>\n";
+			$text .= "</div>";
+		}
+		return $text;
+	}
+	protected function _appendFootnotes_callback($matches) {
+		$node_id = $this->fn_id_prefix . $matches[1];
+		
+		# Create footnote marker only if it has a corresponding footnote *and*
+		# the footnote hasn't been used by another marker.
+		if (isset($this->footnotes[$node_id])) {
+			$num =& $this->footnotes_numbers[$node_id];
+			if (!isset($num)) {
+				# Transfer footnote content to the ordered list and give it its
+				# number
+				$this->footnotes_ordered[$node_id] = $this->footnotes[$node_id];
+				$this->footnotes_ref_count[$node_id] = 1;
+				$num = $this->footnote_counter++;
+				$ref_count_mark = '';
+			} else {
+				$ref_count_mark = $this->footnotes_ref_count[$node_id] += 1;
+			}
+
+			$attr = "";
+			if ($this->fn_link_class != "") {
+				$class = $this->fn_link_class;
+				$class = $this->encodeAttribute($class);
+				$attr .= " class=\"$class\"";
+			}
+			if ($this->fn_link_title != "") {
+				$title = $this->fn_link_title;
+				$title = $this->encodeAttribute($title);
+				$attr .= " title=\"$title\"";
+			}
+			
+			$attr = str_replace("%%", $num, $attr);
+			$node_id = $this->encodeAttribute($node_id);
+			
+			return
+				"<sup id=\"fnref$ref_count_mark:$node_id\">".
+				"<a href=\"#fn:$node_id\"$attr>$num</a>".
+				"</sup>";
+		}
+		
+		return "[^".$matches[1]."]";
+	}
+		
+	
+	### Abbreviations ###
+	
+	protected function stripAbbreviations($text) {
+	#
+	# Strips abbreviations from text, stores titles in hash references.
+	#
+		$less_than_tab = $this->tab_width - 1;
+
+		# Link defs are in the form: [id]*: url "optional title"
+		$text = preg_replace_callback('{
+			^[ ]{0,'.$less_than_tab.'}\*\[(.+?)\][ ]?:	# abbr_id = $1
+			(.*)					# text = $2 (no blank lines allowed)	
+			}xm',
+			array(&$this, '_stripAbbreviations_callback'),
+			$text);
+		return $text;
+	}
+	protected function _stripAbbreviations_callback($matches) {
+		$abbr_word = $matches[1];
+		$abbr_desc = $matches[2];
+		if ($this->abbr_word_re)
+			$this->abbr_word_re .= '|';
+		$this->abbr_word_re .= preg_quote($abbr_word);
+		$this->abbr_desciptions[$abbr_word] = trim($abbr_desc);
+		return ''; # String that will replace the block
+	}
+	
+	
+	protected function doAbbreviations($text) {
+	#
+	# Find defined abbreviations in text and wrap them in <abbr> elements.
+	#
+		if ($this->abbr_word_re) {
+			// cannot use the /x modifier because abbr_word_re may 
+			// contain significant spaces:
+			$text = preg_replace_callback('{'.
+				'(?<![\w\x1A])'.
+				'(?:'.$this->abbr_word_re.')'.
+				'(?![\w\x1A])'.
+				'}', 
+				array(&$this, '_doAbbreviations_callback'), $text);
+		}
+		return $text;
+	}
+	protected function _doAbbreviations_callback($matches) {
+		$abbr = $matches[0];
+		if (isset($this->abbr_desciptions[$abbr])) {
+			$desc = $this->abbr_desciptions[$abbr];
+			if (empty($desc)) {
+				return $this->hashPart("<abbr>$abbr</abbr>");
+			} else {
+				$desc = $this->encodeAttribute($desc);
+				return $this->hashPart("<abbr title=\"$desc\">$abbr</abbr>");
+			}
+		} else {
+			return $matches[0];
+		}
+	}
+
+}
+
+// https://github.com/egil/php-markdown-extra-extended
+class MarkdownExtraExtended extends MarkdownExtra {
+	# Tags that are always treated as block tags:
+	var $block_tags_re = 'figure|figcaption|p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend';
+		
+	function __construct() {
+		$this->block_gamut += array(
+			"doFencedFigures" => 7,
+		);
+		
+		parent::__construct();
+	}
+	
+	function transform($text) {	
+		$text = parent::transform($text);				
+		return $text;		
+	}
+	
+	function doHardBreaks($text) {
+		# Do hard breaks:
+		# EXTENDED: changed to allow breaks without two spaces and just one new line
+		# original code /* return preg_replace_callback('/ {2,}\n/', */
+		return preg_replace_callback('/ *\n/', 
+			array(&$this, '_doHardBreaks_callback'), $text);
+	}
+
+
+	function doBlockQuotes($text) {
+		$text = preg_replace_callback('/
+			(?>^[ ]*>[ ]?
+				(?:\((.+?)\))?
+				[ ]*(.+\n(?:.+\n)*)
+			)+	
+			/xm',
+			array(&$this, '_doBlockQuotes_callback'), $text);
+
+		return $text;
+	}
+	
+	function _doBlockQuotes_callback($matches) {
+		$cite = $matches[1];
+		$bq = '> ' . $matches[2];
+		# trim one level of quoting - trim whitespace-only lines
+		$bq = preg_replace('/^[ ]*>[ ]?|^[ ]+$/m', '', $bq);
+		$bq = $this->runBlockGamut($bq);		# recurse
+
+		$bq = preg_replace('/^/m', "  ", $bq);
+		# These leading spaces cause problem with <pre> content, 
+		# so we need to fix that:
+		$bq = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx', 
+			array(&$this, '_doBlockQuotes_callback2'), $bq);
+		
+		$res = "<blockquote";
+		$res .= empty($cite) ? ">" : " cite=\"$cite\">";
+		$res .= "\n$bq\n</blockquote>";
+		return "\n". $this->hashBlock($res)."\n\n";
+	}
+
+	function doFencedCodeBlocks($text) {
+		$less_than_tab = $this->tab_width;
+		
+		$text = preg_replace_callback('{
+				(?:\n|\A)
+				# 1: Opening marker
+				(
+					~{3,}|`{3,} # Marker: three tilde or more.
+				)
+				
+				[ ]?(\w+)?(?:,[ ]?(\d+))?[ ]* \n # Whitespace and newline following marker.
+				
+				# 3: Content
+				(
+					(?>
+						(?!\1 [ ]* \n)	# Not a closing marker.
+						.*\n+
+					)+
+				)
+				
+				# Closing marker.
+				\1 [ ]* \n
+			}xm',
+			array(&$this, '_doFencedCodeBlocks_callback'), $text);
+
+		return $text;
+	}
+	
+	function _doFencedCodeBlocks_callback($matches) {
+		$codeblock = $matches[4];
+		$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
+		$codeblock = preg_replace_callback('/^\n+/',
+			array(&$this, '_doFencedCodeBlocks_newlines'), $codeblock);
+		//$codeblock = "<pre><code>$codeblock</code></pre>";
+		//$cb = "<pre><code";
+		$cb = empty($matches[3]) ? "<pre><code" : "<pre class=\"linenums:$matches[3]\"><code"; 
+		$cb .= empty($matches[2]) ? ">" : " class=\"lang-$matches[2]\">";
+		$cb .= "$codeblock</code></pre>";
+		return "\n\n".$this->hashBlock($cb)."\n\n";
+	}
+
+	function doFencedFigures($text){
+		$text = preg_replace_callback('{
+			(?:\n|\A)
+			# 1: Opening marker
+			(
+				={3,} # Marker: equal sign.
+			)
+			
+			[ ]?(?:\[([^\]]+)\])?[ ]* \n # Whitespace and newline following marker.
+			
+			# 3: Content
+			(
+				(?>
+					(?!\1 [ ]?(?:\[([^\]]+)\])?[ ]* \n)	# Not a closing marker.
+					.*\n+
+				)+
+			)
+			
+			# Closing marker.
+			\1 [ ]?(?:\[([^\]]+)\])?[ ]* \n
+		}xm', array(&$this, '_doFencedFigures_callback'), $text);		
+		
+		return $text;	
+	}
+	
+	function _doFencedFigures_callback($matches) {
+		# get figcaption
+		$topcaption = empty($matches[2]) ? null : $this->runBlockGamut($matches[2]);
+		$bottomcaption = empty($matches[5]) ? null : $this->runBlockGamut($matches[5]);
+		$figure = $matches[3];
+		$figure = $this->runBlockGamut($figure); # recurse
+
+		$figure = preg_replace('/^/m', "  ", $figure);
+		# These leading spaces cause problem with <pre> content, 
+		# so we need to fix that - reuse blockqoute code to handle this:
+		$figure = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx', 
+			array(&$this, '_doBlockQuotes_callback2'), $figure);
+		
+		$res = "<figure>";
+		if(!empty($topcaption)){
+			$res .= "\n<figcaption>$topcaption</figcaption>";
+		}
+		$res .= "\n$figure\n";
+		if(!empty($bottomcaption) && empty($topcaption)){
+			$res .= "<figcaption>$bottomcaption</figcaption>";
+		}
+		$res .= "</figure>";		
+		return "\n". $this->hashBlock($res)."\n\n";
+	}
+}
+
diff --git a/var/Typecho/Widget/Helper/PageNavigator/Box.php b/var/Typecho/Widget/Helper/PageNavigator/Box.php
index 3537ce8e..b1f3dd27 100644
--- a/var/Typecho/Widget/Helper/PageNavigator/Box.php
+++ b/var/Typecho/Widget/Helper/PageNavigator/Box.php
@@ -29,9 +29,10 @@ class Typecho_Widget_Helper_PageNavigator_Box extends Typecho_Widget_Helper_Page
      * @param string $nextWord 下一页文字
      * @param int $splitPage 分割范围
      * @param string $splitWord 分割字符
+     * @param string $currentClass 当前激活元素class
      * @return void
      */
-    public function render($prevWord = 'PREV', $nextWord = 'NEXT', $splitPage = 3, $splitWord = '...')
+    public function render($prevWord = 'PREV', $nextWord = 'NEXT', $splitPage = 3, $splitWord = '...', $currentClass)
     {
         if ($this->_total < 1) {
             return;
@@ -52,13 +53,13 @@ class Typecho_Widget_Helper_PageNavigator_Box extends Typecho_Widget_Helper_Page
 
             if ($from > 2) {
                 //输出省略号
-                echo '<li>' . $splitWord . '</li>';
+                echo '<li><span>' . $splitWord . '</span></li>';
             }
         }
 
         //输出中间页
         for ($i = $from; $i <= $to; $i ++) {
-                echo '<li' . ($i != $this->_currentPage ? '' : ' class="current"') . '><a href="' .
+                echo '<li' . ($i != $this->_currentPage ? '' : ' class="' . $currentClass . '"') . '><a href="' .
                 str_replace($this->_pageHolder, $i, $this->_pageTemplate) . $this->_anchor . '">'
                 . $i . '</a></li>';
         }
@@ -66,7 +67,7 @@ class Typecho_Widget_Helper_PageNavigator_Box extends Typecho_Widget_Helper_Page
         //输出最后页
         if ($to < $this->_totalPage) {
             if ($to < $this->_totalPage - 1) {
-                echo '<li>' . $splitWord . '</li>';
+                echo '<li><span>' . $splitWord . '</span></li>';
             }
 
             echo '<li><a href="' . str_replace($this->_pageHolder, $this->_totalPage, $this->_pageTemplate) . $this->_anchor . '">'
diff --git a/var/Widget/Abstract/Contents.php b/var/Widget/Abstract/Contents.php
index eaddb78e..e4383dbb 100644
--- a/var/Widget/Abstract/Contents.php
+++ b/var/Widget/Abstract/Contents.php
@@ -90,8 +90,7 @@ class Widget_Abstract_Contents extends Widget_Abstract
         $content = $this->pluginHandle(__CLASS__)->trigger($plugged)->excerpt($this->text, $this);
         if (!$plugged) {
             if ($this->isMarkdown) {
-                $markdown = new Markdown();
-                $content = $markdown->transform($content);
+                $content = MarkdownExtraExtended::defaultTransform($content);
             } else {
                 $content = Typecho_Common::cutParagraph($content);
             }
@@ -119,8 +118,7 @@ class Widget_Abstract_Contents extends Widget_Abstract
 
         if (!$plugged) {
             if ($this->isMarkdown) {
-                $markdown = new Markdown();
-                $content = $markdown->transform($content);
+                $content = MarkdownExtraExtended::defaultTransform($content);
             } else {
                 $content = Typecho_Common::cutParagraph($content);
             }
diff --git a/var/Widget/Archive.php b/var/Widget/Archive.php
index 8ad7a9ce..80249147 100644
--- a/var/Widget/Archive.php
+++ b/var/Widget/Archive.php
@@ -1314,7 +1314,8 @@ class Widget_Archive extends Widget_Abstract_Contents
      * @param string $splitWord 分割字符
      * @return void
      */
-    public function pageNav($prev = '&laquo;', $next = '&raquo;', $splitPage = 3, $splitWord = '...')
+    public function pageNav($prev = '&laquo;', $next = '&raquo;', $splitPage = 3, $splitWord = '...',
+        $class = 'page-navigator', $currentClass = 'current')
     {
         if ($this->have()) {
             $hasNav = false;
@@ -1329,8 +1330,8 @@ class Widget_Archive extends Widget_Abstract_Contents
                 $nav = new Typecho_Widget_Helper_PageNavigator_Box(false === $this->_total ? $this->_total = $this->size($this->_countSql) : $this->_total,
                 $this->_currentPage, $this->parameter->pageSize, $query);
                 
-                echo '<ol class="page-navigator">';
-                $nav->render($prev, $next, $splitPage, $splitWord);
+                echo '<ol class="' . $class . '">';
+                $nav->render($prev, $next, $splitPage, $splitWord, $currentClass);
                 echo '</ol>';
             }
         }