diff --git a/phpBB/styles/prosilver/template/forum_fn.js b/phpBB/styles/prosilver/template/forum_fn.js
index eccb12e827..4fb8f7b284 100644
--- a/phpBB/styles/prosilver/template/forum_fn.js
+++ b/phpBB/styles/prosilver/template/forum_fn.js
@@ -42,19 +42,12 @@ function jumpto() {
 * id = ID of parent container, name = name prefix, state = state [true/false]
 */
 function marklist(id, name, state) {
-	var parent = document.getElementById(id) || document[id];
-
-	if (!parent) {
-		return;
-	}
-
-	var rb = parent.getElementsByTagName('input');
-
-	for (var r = 0; r < rb.length; r++) {
-		if (rb[r].name.substr(0, name.length) === name) {
-			rb[r].checked = state;
+	jQuery('#' + id + ' input[type=checkbox][name]').each(function() {
+		var $this = jQuery(this);
+		if ($this.attr('name').substr(0, name.length) == name) {
+			$this.prop('checked', state);
 		}
-	}
+	});
 }
 
 /**
@@ -124,29 +117,15 @@ jQuery(document).ready(function() {
 		}
 
 		function subPanels(p) {
-			var i, e, t;
+			var i;
 
 			if (typeof(p) === 'string') {
 				show_panel = p;
 			}
 
 			for (i = 0; i < panels.length; i++) {
-				e = document.getElementById(panels[i]);
-				t = document.getElementById(panels[i] + '-tab');
-
-				if (e) {
-					if (panels[i] === show_panel) {
-						e.style.display = 'block';
-						if (t) {
-							t.className = 'activetab';
-						}
-					} else {
-						e.style.display = 'none';
-						if (t) {
-							t.className = '';
-						}
-					}
-				}
+				jQuery('#' + panels[i]).css('display', panels[i] === show_panel ? 'block' : 'none');
+				jQuery('#' + panels[i] + '-tab').toggleClass('activetab', panels[i] === show_panel);
 			}
 		}
 	});
@@ -255,57 +234,6 @@ function play_qt_file(obj) {
 	obj.Play();
 }
 
-/**
-* Check if the nodeName of elem is name
-* @author jQuery
-*/
-function is_node_name(elem, name) {
-	return elem.nodeName && elem.nodeName.toUpperCase() === name.toUpperCase();
-}
-
-/**
-* Check if elem is in array, return position
-* @author jQuery
-*/
-function is_in_array(elem, array) {
-	for (var i = 0, length = array.length; i < length; i++) {
-		// === is correct (IE)
-		if (array[i] === elem) {
-			return i;
-		}
-	}
-
-	return -1;
-}
-
-/**
-* Find Element, type and class in tree
-* Not used, but may come in handy for those not using JQuery
-* @author jQuery.find, Meik Sievertsen
-*/
-function find_in_tree(node, tag, type, class_name) {
-	var result, element, i = 0, length = node.childNodes.length;
-
-	for (element = node.childNodes[0]; i < length; element = node.childNodes[++i]) {
-		if (!element || element.nodeType !== 1) {
-			continue;
-		}
-
-		if ((!tag || is_node_name(element, tag)) && (!type || element.type === type)
-				&& (!class_name || is_in_array(class_name, (element.className || element).toString().split(/\s+/)) > -1)) {
-			return element;
-		}
-
-		if (element.childNodes.length) {
-			result = find_in_tree(element, tag, type, class_name);
-		}
-
-		if (result) {
-			return result;
-		}
-	}
-}
-
 var in_autocomplete = false;
 var last_key_entered = '';
 
@@ -336,47 +264,6 @@ function phpbb_check_key(event) {
 	return false;
 }
 
-/**
-* Usually used for onkeypress event, to submit a form on enter
-*/
-function submit_default_button(event, selector, class_name) {
-	// Add which for key events
-	if (!event.which && ((event.charCode || event.charCode === 0) ? event.charCode : event.keyCode)) {
-		event.which = event.charCode || event.keyCode;
-	}
-
-	if (phpbb_check_key(event)) {
-		return true;
-	}
-
-	var current = selector.parentNode;
-
-	// Search parent form element
-	while (current && (!current.nodeName || current.nodeType !== 1 || !is_node_name(current, 'form')) && current !== document) {
-		current = current.parentNode;
-	}
-
-	// Find the input submit button with the class name
-	//current = find_in_tree(current, 'input', 'submit', class_name);
-	var input_tags = current.getElementsByTagName('input');
-	current = false;
-
-	for (var i = 0, element = input_tags[0]; i < input_tags.length; element = input_tags[++i]) {
-		if (element.type === 'submit' && is_in_array(class_name, (element.className || element).toString().split(/\s+/)) > -1) {
-			current = element;
-		}
-	}
-
-	if (!current) {
-		return true;
-	}
-
-	// Submit form
-	current.focus();
-	current.click();
-	return false;
-}
-
 /**
 * Apply onkeypress event for forcing default submit button on ENTER key press
 * The jQuery snippet used is based on http://greatwebguy.com/programming/dom/default-html-button-submit-on-enter-with-jquery/