diff --git a/src/_h5ai/config.js b/src/_h5ai/config.js
index 3292a649..d0b7035e 100644
--- a/src/_h5ai/config.js
+++ b/src/_h5ai/config.js
@@ -25,8 +25,8 @@ var H5AI_CONFIG = {
 		 *
 		 * This is disabled by default.
 		 */
-		"customHeader": false,
-		"customFooter": false,
+		"customHeader": "_h5ai.header.html",
+		"customFooter": "_h5ai.footer.html",
 
 		/*
 		 * An array of view modes the user may choose from. Currently there
@@ -105,13 +105,13 @@ var H5AI_CONFIG = {
 		 * Requires PHP on the server.
 		 * Show thumbnails for image files.
 		 */
-		"showThumbs": false,
+		"showThumbs": true,
 
 		/*
 		 * Requires PHP on the server.
 		 * Enable zipped download of selected entries.
 		 */
-		"zippedDownload": false
+		"zippedDownload": true
 	},
 
 
diff --git a/src/_h5ai/php/config.php b/src/_h5ai/config.php
similarity index 81%
rename from src/_h5ai/php/config.php
rename to src/_h5ai/config.php
index 8602b824..f901fa31 100644
--- a/src/_h5ai/php/config.php
+++ b/src/_h5ai/config.php
@@ -12,9 +12,9 @@ $H5AI_CONFIG = array();
 /*
  * This configuration assumes that h5ai is installed
  * in the webroot directory of the Apache server.
+ * Assumed to end with a slash.
  */
-$H5AI_CONFIG["H5AI_ROOT"] = dirname(dirname(__FILE__));
-$H5AI_CONFIG["DOCUMENT_ROOT"] = dirname($H5AI_CONFIG["H5AI_ROOT"]);
+$H5AI_CONFIG["ROOT_ABS_PATH"] = dirname(dirname(str_replace('\\', '/', __FILE__)));
 
 /*
  * Files/folders that should not be listed. Specified
diff --git a/src/_h5ai/php/api.php b/src/_h5ai/php/api.php
index c997b7d6..c3d12b30 100644
--- a/src/_h5ai/php/api.php
+++ b/src/_h5ai/php/api.php
@@ -1,5 +1,23 @@
 <?php
 
+function safe_dirname($path, $endWithSlash = false) {
+	
+	$path = str_replace("\\", "/", dirname($path));
+	return preg_match("#^(\w:)?/$#", $path) ? $path : (preg_replace('#/$#', '', $path) . ($endWithSlash ? "/" : ""));
+}
+
+define("H5AI_ABS_PATH", safe_dirname(safe_dirname(__FILE__)));
+
+function require_h5ai($lib) {
+
+	require_once(H5AI_ABS_PATH . $lib);
+}
+
+
+require_h5ai("/php/inc/H5ai.php");
+$h5ai = new H5ai();
+$options = $h5ai->getOptions();
+
 
 function fail($code, $msg, $cond = true) {
 	if ($cond) {
@@ -21,12 +39,6 @@ function checkKeys($keys) {
 list($action) = checkKeys(array("action"));
 
 
-require_once "config.php";
-require_once "inc/H5ai.php";
-$h5ai = new H5ai();
-$options = $h5ai->getOptions();
-
-
 if ($action === "httpcodes") {
 
 	list($hrefs) = checkKeys(array("hrefs"));
@@ -55,10 +67,10 @@ else if ($action === "thumb") {
 	fail(0, "thumbs are disabled", !$options["showThumbs"]);
 	list($srcAbsHref, $width, $height, $mode) = checkKeys(array("href", "width", "height", "mode"));
 
-	require_once "inc/Thumbnail.php";
-	require_once "inc/Image.php";
+	require_h5ai("/php/inc/Thumbnail.php");
+	require_h5ai("/php/inc/Image.php");
 
-	$srcAbsPath = $h5ai->getDocRoot() . rawurldecode($srcAbsHref);
+	$srcAbsPath = $h5ai->getRootAbsPath() . rawurldecode($srcAbsHref);
 
 	if (!Thumbnail::isUsable()) {
 		Image::showImage($srcAbsPath);
@@ -82,7 +94,7 @@ else if ($action === "tree") {
 
 	list($href) = checkKeys(array("href"));
 
-	require_once "inc/Tree.php";
+	require_h5ai("/php/inc/Tree.php");
 
 	$absHref = trim($href);
 	$absPath = $h5ai->getAbsPath($absHref);
@@ -99,7 +111,7 @@ else if ($action === "zip") {
 	fail(0, "zipped download is disabled", !$options["zippedDownload"]);
 	list($hrefs) = checkKeys(array("hrefs"));
 
-	require_once "inc/ZipIt.php";
+	require_h5ai("/php/inc/ZipIt.php");
 
 	$zipit = new ZipIt($h5ai);
 
diff --git a/src/_h5ai/php/inc/Cache.php b/src/_h5ai/php/inc/Cache.php
index 45015e86..0a507a41 100644
--- a/src/_h5ai/php/inc/Cache.php
+++ b/src/_h5ai/php/inc/Cache.php
@@ -7,18 +7,22 @@
 ##############################################
 
 class Cache {
+
 	private $dir;
 
+
 	function __construct($dir) {
 
 		$this->dir = $dir;
 	}
 
+
 	private function _name($key) {
 
 		return $this->dir . "/" . sha1($key);
 	}
 
+
 	public function get($key, $expiration = 3600) {
 
 		if (!is_dir($this->dir) || !is_writable($this->dir)) {
@@ -55,6 +59,7 @@ class Cache {
 		return $cache;
 	}
 
+
 	public function set($key, $data) {
 
 		if (!is_dir($this->dir) || !is_writable($this->dir)) {
@@ -78,6 +83,7 @@ class Cache {
 		return true;
 	}
 
+
 	public function clear($key) {
 
 		$cache_path = $this->_name($key);
diff --git a/src/_h5ai/php/inc/Crumb.php b/src/_h5ai/php/inc/Crumb.php
index 2f415750..9d10ab00 100644
--- a/src/_h5ai/php/inc/Crumb.php
+++ b/src/_h5ai/php/inc/Crumb.php
@@ -1,8 +1,10 @@
 <?php
 
 class Crumb {
+
 	private $h5ai, $parts;
 
+
 	public function __construct($h5ai) {
 
 		$this->h5ai = $h5ai;
@@ -11,13 +13,14 @@ class Crumb {
 		$href = $h5ai->getAbsHref();
 		while ($href !== "/" && $href !== "//") {
 			$this->parts[] = $href;
-			$href = dirname($href) . "/";
+			$href = safe_dirname($href, true);
 		}
 		$this->parts[] = "/";
 
 		$this->parts = array_reverse($this->parts);
 	}
 
+
 	public function toHtml() {
 
 		$html = "";
diff --git a/src/_h5ai/php/inc/Customize.php b/src/_h5ai/php/inc/Customize.php
index 689977c3..967770f0 100644
--- a/src/_h5ai/php/inc/Customize.php
+++ b/src/_h5ai/php/inc/Customize.php
@@ -1,8 +1,10 @@
 <?php
 
 class Customize {
+
 	private $customHeader, $customFooter;
 
+
 	public function __construct($h5ai) {
 
 		$absPath = $h5ai->getAbsPath();
@@ -11,19 +13,22 @@ class Customize {
 		$this->customFooter = $options["customFooter"] ? $absPath . "/" . $options["customFooter"] : false;
 	}
 
+
 	public function getHeader() {
 
 		return $this->getContent($this->customHeader, "header");
 	}
 
+
 	public function getFooter() {
 
 		return $this->getContent($this->customFooter, "footer");
 	}
 
+
 	private function getContent($file, $tag) {
 
-		return (is_string($file) && file_exists($file)) ? ("<" . $tag . ">" . file_get_contents($file) . "</" . $tag . ">") : "";
+		return (is_string($file) && file_exists($file)) ? ("<$tag>" . file_get_contents($file) . "</$tag>") : "";
 	}
 }
 
diff --git a/src/_h5ai/php/inc/Extended.php b/src/_h5ai/php/inc/Extended.php
index ed941635..f2b8ee7c 100644
--- a/src/_h5ai/php/inc/Extended.php
+++ b/src/_h5ai/php/inc/Extended.php
@@ -1,11 +1,13 @@
 <?php
 
-require_once "Thumbnail.php";
+require_h5ai("/php/inc/Thumbnail.php");
 
 
 class Entry {
+
 	private $h5ai, $label, $absPath, $absHref, $date, $isFolder, $type, $size, $thumbTypes;
 
+
 	public function __construct($h5ai, $absPath, $absHref, $type = null, $label = null) {
 
 		$this->h5ai = $h5ai;
@@ -27,11 +29,13 @@ class Entry {
 		$this->thumbTypes = array("bmp", "gif", "ico", "image", "jpg", "png", "tiff");
 	}
 
+
 	public function isFolder() {
 
 		return $this->isFolder;
 	}
 
+
 	public function toHtml() {
 
 		$classes = "entry " . ($this->isFolder ? "folder " : "file ") . $this->type;
@@ -80,8 +84,10 @@ class Entry {
 
 
 class Extended {
+
 	private $h5ai, $parent, $content;
 
+
 	public function __construct($h5ai) {
 
 		$this->h5ai = $h5ai;
@@ -90,12 +96,13 @@ class Extended {
 		$this->loadContent();
 	}
 
+
 	private function loadContent() {
 
 		if ($this->h5ai->getAbsHref() !== "/") {
 			$options = $this->h5ai->getOptions();
-			$parentPath = dirname($this->h5ai->getAbsPath());
-			$parentHref = dirname($this->h5ai->getAbsHref());
+			$parentPath = safe_dirname($this->h5ai->getAbsPath());
+			$parentHref = safe_dirname($this->h5ai->getAbsHref(), true);
 			$label = $options["setParentFolderLabels"] === true ? $this->h5ai->getLabel($parentHref) : "<span class='l10n-parentDirectory'>Parent Directory</span>";
 			$this->parent = new Entry($this->h5ai, $parentPath, $parentHref, "folder-parent", $label);
 		}
@@ -110,6 +117,7 @@ class Extended {
 		}
 	}
 
+
 	public function toHtml() {
 
 		$html = "<section id='extended' class='" . $this->h5ai->getView() . "-view clearfix'>\n";
@@ -129,6 +137,7 @@ class Extended {
 		return $html;
 	}
 
+
 	public function generateHeaders() {
 
 		$html = "\t<li class='header'>\n";
diff --git a/src/_h5ai/php/inc/H5ai.php b/src/_h5ai/php/inc/H5ai.php
index b14a9e65..98e88965 100644
--- a/src/_h5ai/php/inc/H5ai.php
+++ b/src/_h5ai/php/inc/H5ai.php
@@ -1,34 +1,38 @@
 <?php
 
-require_once "Cache.php";
+require_h5ai("/config.php");
+require_h5ai("/php/inc/Cache.php");
 
 class H5ai {
+
 	private static $VIEWMODES = array("details", "icons");
 
-	private $docRoot, $h5aiRoot, $h5aiAbsHref, $domain,
+	private $h5aiAbsPath,
+			$rootAbsPath, $ignore, $ignoreRE,
 			$config, $options, $types, $langs,
 			$cache,
+			$rootAbsHref, $h5aiAbsHref, $domain,
 			$absHref, $absPath,
-			$ignore, $ignoreRE,
 			$view;
 
+
 	public function __construct() {
 
-		global $H5AI_CONFIG;
+		$this->h5aiAbsPath = H5AI_ABS_PATH;
 
-		$this->docRoot = $H5AI_CONFIG["DOCUMENT_ROOT"];
-		$this->h5aiRoot = $H5AI_CONFIG["H5AI_ROOT"];
+		global $H5AI_CONFIG;
+		$this->rootAbsPath = $H5AI_CONFIG["ROOT_ABS_PATH"];
 		$this->ignore = $H5AI_CONFIG["IGNORE"];
 		$this->ignoreRE = $H5AI_CONFIG["IGNORE_PATTERNS"];
 
-		$this->config = $this->loadConfig($this->h5aiRoot . "/config.js");
+		$this->config = $this->loadConfig($this->h5aiAbsPath . "/config.js");
 		$this->options = $this->config["options"];
 		$this->types = $this->config["types"];
 		$this->langs = $this->config["langs"];
 
-		$this->cache = new Cache($this->h5aiRoot . "/cache");
+		$this->cache = new Cache($this->h5aiAbsPath . "/cache");
 
-		$this->hrefRoot = $this->options["rootAbsHref"];
+		$this->rootAbsHref = $this->options["rootAbsHref"];
 		$this->h5aiAbsHref = $this->options["h5aiAbsHref"];
 		$this->domain = getenv("HTTP_HOST");
 
@@ -56,101 +60,111 @@ class H5ai {
 	}
 
 
-	public function getDocRoot() {
+	public function getH5aiAbsPath() {
 
-		return $this->docRoot;
+		return $this->h5aiAbsPath;
 	}
 
-	public function getH5aiRoot() {
 
-		return $this->h5aiRoot;
+	public function getRootAbsPath() {
+
+		return $this->rootAbsPath;
 	}
 
-	public function getHrefRoot() {
 
-		return $this->hrefRoot;
+	public function getRootAbsHref() {
+
+		return $this->rootAbsHref;
 	}
 
+
 	public function getH5aiAbsHref() {
 
 		return $this->h5aiAbsHref;
 	}
 
+
 	public function getDomain() {
 
 		return $this->domain;
 	}
 
+
 	public function getView() {
 
 		return $this->view;
 	}
 
+
 	public function api() {
 
 		return $this->h5aiAbsHref . "php/api.php";
 	}
 
+
 	public function image($id) {
 
 		return $this->h5aiAbsHref . "images/" . $id . ".png";
 	}
 
+
 	public function icon($id, $big = false) {
 
 		return $this->h5aiAbsHref . "icons/" . ($big ? "48x48" : "16x16") . "/" . $id . ".png";
 	}
 
+
 	public function getOptions() {
 
 		return $this->options;
 	}
 
+
 	public function getLangs() {
 
 		return $this->langs;
 	}
 
+
 	public function getAbsHref($absPath = null, $endWithSlash = true) {
 
 		if ($absPath === null) {
 			return $this->absHref;
 		}
 
-		//
-		$absPath=substr($absPath, strlen($this->docRoot));
+		$absPath=substr($absPath, strlen($this->rootAbsPath));
 
-		$absHref = preg_replace("!^" . $this->docRoot . "!", "", $absPath);
-		$parts = explode("/", $absHref);
+		$parts = explode("/", $absPath);
 		$encodedParts = array();
 		foreach ($parts as $part) {
 			$encodedParts[] = rawurlencode($part);
 		}
 		$endodedAbsHref = implode("/", $encodedParts);
 
-		//
-		$endodedAbsHref = $this->hrefRoot . $endodedAbsHref;
+		$endodedAbsHref = $this->rootAbsHref . $endodedAbsHref;
 
 		return $this->normalizePath($endodedAbsHref, $endWithSlash);
 	}
 
+
 	public function getAbsPath($absHref = null) {
 
 		if ($absHref === null) {
 			return $this->absPath;
 		}
 
-		//
-		$absHref=substr($absHref, strlen($this->hrefRoot));
+		$absHref=substr($absHref, strlen($this->rootAbsHref));
 
-		return $this->normalizePath($this->docRoot . "/" . rawurldecode($absHref), false);
+		return $this->normalizePath($this->rootAbsPath . "/" . rawurldecode($absHref), false);
 	}
 
+
 	public function showThumbs() {
 
 		return $this->options["showThumbs"] === true;
 	}
 
+
 	public function getTitle() {
 
 		$title = $this->domain . rawurldecode($this->absHref);
@@ -162,6 +176,7 @@ class H5ai {
 		return $title;
 	}
 
+
 	public function getType($absPath) {
 
 		foreach($this->types as $type => $exts) {
@@ -174,9 +189,10 @@ class H5ai {
 		return "unknown";
 	}
 
+
 	public function ignoreThisFile($file) {
 
-		# always ignore
+		// always ignore
 		if ($file === "." || $file === ".." || $this->startsWith($file, '.ht')) {
 			return true;
 		}
@@ -193,6 +209,7 @@ class H5ai {
 		return false;
 	}
 
+
 	public function readDir($path) {
 
 		$content = array();
@@ -209,33 +226,39 @@ class H5ai {
 		return $content;
 	}
 
+
 	public function getLabel($absHref) {
 
 		return $absHref === "/" ? $this->domain : rawurldecode(basename($absHref));
 	}
 
+
 	public function normalizePath($path, $endWithSlash) {
 
-		return ($path === "/") ? "/" : (preg_replace('#/$#', '', $path) . ($endWithSlash ? "/" : ""));
+		return $path === "/" ? "/" : (preg_replace('#/$#', '', $path) . ($endWithSlash ? "/" : ""));
 	}
 
+
 	public function startsWith($sequence, $start) {
 
 		return strcasecmp(substr($sequence, 0, strlen($start)), $start) === 0;
 	}
 
+
 	public function endsWith($sequence, $end) {
 
 		return strcasecmp(substr($sequence, -strlen($end)), $end) === 0;
 	}
 
+
 	public function getHttpCode($absHref) {
 
 		return $this->cachedHttpCode($absHref);
-		#return $this->fetchHttpCode($absHref);
-		#return $this->guessHttpCode($absHref);
+		// return $this->fetchHttpCode($absHref);
+		// return $this->guessHttpCode($absHref);
 	}
 
+
 	public function cachedHttpCode($absHref) {
 
 		$cached = $this->cache->get($absHref);
@@ -252,6 +275,7 @@ class H5ai {
 		return $cached["code"];
 	}
 
+
 	public function fetchHttpCode($absHref) {
 
 		$contentType = "Content-Type:";
@@ -286,6 +310,7 @@ class H5ai {
 		return $code;
 	}
 
+
 	public function guessHttpCode($absHref) {
 
 		$indexFiles = array("index.html", "index.cgi", "index.pl", "index.php", "index.xhtml", "index.htm");
diff --git a/src/_h5ai/php/inc/Image.php b/src/_h5ai/php/inc/Image.php
index 69356b24..198d04b3 100644
--- a/src/_h5ai/php/inc/Image.php
+++ b/src/_h5ai/php/inc/Image.php
@@ -2,13 +2,7 @@
 
 class Image {
 
-	private $sourceFile;
-	private $source;
-	private $width;
-	private $height;
-	private $type;
-
-	private $dest;
+	private $sourceFile, $source, $width, $height, $type, $dest;
 
 
 	public static function isUsable() {
diff --git a/src/_h5ai/php/inc/Thumbnail.php b/src/_h5ai/php/inc/Thumbnail.php
index 1443b651..6085f368 100644
--- a/src/_h5ai/php/inc/Thumbnail.php
+++ b/src/_h5ai/php/inc/Thumbnail.php
@@ -1,31 +1,34 @@
 <?php
 
-require_once "Image.php";
+require_h5ai("/php/inc/Image.php");
 
 
 class Thumbnail {
 
 	private $srcAbsHref, $srcAbsPath, $width, $height, $name, $href, $path;
 
+
 	public static function isUsable() {
 
 		return Image::isUsable();
 	}
 
+
 	public function __construct($h5ai, $absHref, $mode, $width, $height) {
 
 		$this->h5ai = $h5ai;
 		$this->srcAbsHref = $absHref;
-		$this->srcAbsPath = $this->h5ai->getDocRoot() . urldecode($absHref);
+		$this->srcAbsPath = $this->h5ai->getRootAbsPath() . urldecode($absHref);
 		$this->width = $width;
 		$this->height = $height;
 		$this->mode = $mode;
 		$this->name = sha1("$this->srcAbsPath-$this->width-$this->height-$this->mode");
-		$this->href = $this->h5ai->getH5aiAbsHref() . "/cache/thumb-" . $this->name . ".jpg";
-		$this->path = $this->h5ai->getDocRoot() . $this->href;
+		$this->href = $this->h5ai->getH5aiAbsHref() . "cache/thumb-" . $this->name . ".jpg";
+		$this->path = $this->h5ai->getRootAbsPath() . $this->href;
 		$this->liveHref = $this->h5ai->api() . "?action=thumb&href=" . $this->srcAbsHref . "&width=" . $this->width . "&height=" . $this->height . "&mode=" . $this->mode;
 	}
 
+
 	public function create($force = 0) {
 
 		if (
@@ -40,16 +43,19 @@ class Thumbnail {
 		}
 	}
 
+
 	public function getHref() {
 
 		return $this->href;
 	}
 
+
 	public function getPath() {
 
 		return $this->path;
 	}
 
+
 	public function getLiveHref() {
 
 		return $this->liveHref;
diff --git a/src/_h5ai/php/inc/Tree.php b/src/_h5ai/php/inc/Tree.php
index be1a9bb8..7c4d0644 100644
--- a/src/_h5ai/php/inc/Tree.php
+++ b/src/_h5ai/php/inc/Tree.php
@@ -1,8 +1,10 @@
 <?php
 
 class TreeEntry {
+
 	private $h5ai, $label, $absPath, $absHref, $isFolder, $type, $content;
 
+
 	public function __construct($h5ai, $absPath, $absHref, $type = null) {
 
 		$this->h5ai = $h5ai;
@@ -16,6 +18,7 @@ class TreeEntry {
 		$this->content = null;
 	}
 
+
 	public function loadContent() {
 
 		$this->content = array();
@@ -36,6 +39,7 @@ class TreeEntry {
 		$this->sort();
 	}
 
+
 	public function cmpTrees($t1, $t2) {
 
 		if ($t1->isFolder && !$t2->isFolder) {
@@ -47,6 +51,7 @@ class TreeEntry {
 		return strcasecmp($t1->absPath, $t2->absPath);
 	}
 
+
 	public function sort() {
 
 		if ($this->content !== null) {
@@ -54,6 +59,7 @@ class TreeEntry {
 		}
 	}
 
+
 	public function toHtml() {
 
 		$classes = "entry " . $this->type . ($this->absHref === $this->h5ai->getAbsHref() ? " current" : "");
@@ -94,6 +100,7 @@ class TreeEntry {
 		return $html;
 	}
 
+
 	public function contentToHtml() {
 
 		$html = "<ul class='content'>\n";
@@ -106,13 +113,14 @@ class TreeEntry {
 		return $html;
 	}
 
+
 	public function getRoot() {
 
 		if ($this->absHref === "/") {
 			return $this;
 		};
 
-		$tree = new TreeEntry($this->h5ai, dirname($this->absPath), dirname($this->absHref));
+		$tree = new TreeEntry($this->h5ai, safe_dirname($this->absPath), safe_dirname($this->absHref, true));
 		$tree->loadContent();
 		$tree->content[$this->absPath] = $this;
 
@@ -122,13 +130,16 @@ class TreeEntry {
 
 
 class Tree {
+
 	private $h5ai;
 
+
 	public function __construct($h5ai) {
 
 		$this->h5ai = $h5ai;
 	}
 
+
 	public function toHtml() {
 
 		$options = $this->h5ai->getOptions();
diff --git a/src/_h5ai/php/inc/ZipIt.php b/src/_h5ai/php/inc/ZipIt.php
index a86a7279..5e2c9022 100644
--- a/src/_h5ai/php/inc/ZipIt.php
+++ b/src/_h5ai/php/inc/ZipIt.php
@@ -1,13 +1,16 @@
 <?php
 
 class ZipIt {
+
 	private $h5ai;
 
+
 	public function __construct($h5ai) {
 
 		$this->h5ai = $h5ai;
 	}
 
+
 	public function zip($hrefs) {
 
 		$zipFile = tempnam("/tmp", "h5ai-download");
@@ -18,11 +21,11 @@ class ZipIt {
 		}
 
 		foreach ($hrefs as $href) {
-			$d = dirname($href);
+			$d = safe_dirname($href, true);
 			$n = basename($href);
 			if ($this->h5ai->getHttpCode($this->h5ai->getAbsHref($d)) === "h5ai" && !$this->h5ai->ignoreThisFile($n)) {
 				$localFile = $this->h5ai->getAbsPath($href);
-				$file = preg_replace("!^" . $this->h5ai->getDocRoot() . "!", "", $localFile);
+				$file = preg_replace("!^" . $this->h5ai->getRootAbsPath() . "!", "", $localFile);
 				if (is_dir($localFile)) {
 					$this->zipDir($zip, $localFile, $file);
 				} else {
@@ -35,6 +38,7 @@ class ZipIt {
 		return $zipFile;
 	}
 
+
 	private function zipFile($zip, $localFile, $file) {
 
 		if (is_readable($localFile)) {
@@ -42,6 +46,7 @@ class ZipIt {
 		}
 	}
 
+
 	private function zipDir($zip, $localDir, $dir) {
 
 		if ($this->h5ai->getHttpCode($this->h5ai->getAbsHref($localDir)) === "h5ai") {
diff --git a/src/_h5ai/php/main.php b/src/_h5ai/php/main.php
index a11e837a..2e4af69b 100644
--- a/src/_h5ai/php/main.php
+++ b/src/_h5ai/php/main.php
@@ -1,11 +1,23 @@
 <?php
 
-require_once "config.php";
-require_once "inc/H5ai.php";
-require_once "inc/Crumb.php";
-require_once "inc/Customize.php";
-require_once "inc/Extended.php";
-require_once "inc/Tree.php";
+function safe_dirname($path, $endWithSlash = false) {
+	
+	$path = str_replace("\\", "/", dirname($path));
+	return preg_match("#^(\w:)?/$#", $path) ? $path : (preg_replace('#/$#', '', $path) . ($endWithSlash ? "/" : ""));
+}
+
+define("H5AI_ABS_PATH", safe_dirname(safe_dirname(__FILE__)));
+
+function require_h5ai($lib) {
+
+	require_once(H5AI_ABS_PATH . $lib);
+}
+
+require_h5ai("/php/inc/H5ai.php");
+require_h5ai("/php/inc/Crumb.php");
+require_h5ai("/php/inc/Customize.php");
+require_h5ai("/php/inc/Extended.php");
+require_h5ai("/php/inc/Tree.php");
 
 $h5ai = new H5ai();
 $crumb = new Crumb($h5ai);