diff --git a/css/TreeDropdownField.css b/css/TreeDropdownField.css
index 23981f2f9..49ce0edb0 100644
--- a/css/TreeDropdownField.css
+++ b/css/TreeDropdownField.css
@@ -1,78 +1,43 @@
 div.TreeDropdownField {
-	width: 35em;
-	padding: 0;
-}
-html>body div.TreeDropdownField {
-	position:relative;
-}
-
-div.TreeDropdownField {
-	width: 27.7em;
-	background: #fff;
-	font-size: 12px;
+	width: 200px;
 	height: 21px;
 }
 
 div.TreeDropdownField span.items {
+	float: left;
+	overflow:hidden;
+	width: 174px;
 	height: 14px;
 	border: 1px #7f9db9 solid;
 	cursor: pointer;
-	width: 25.4em;
-	float: left;
-	padding: 2px 0 2.5px 4px;
+	padding: 2px 0 2px 4px;
 	background-color: #fff;
-	margin:0;
-	font-size: 12px;
-	overflow:hidden;
 }
 
-div.TreeDropdownField div.tree_holder {
-	clear: left;
+div.TreeDropdownField .panel {
+	position:relative;
+	overflow: auto;
+	display: none;
+	z-index: 1000;
 	cursor: default;
 	border: 1px black solid;
-	margin: 0;
+	width: 200px;
 	height: 200px;
-	overflow: auto;
 	background-color: #fff;
-	/**
-	 * HACK IE6, see http://www.hedgerwow.com/360/bugs/css-select-free.html
-	 */
-	position:absolute;
-	z-index:10;
-	width:33em;/*must have for any value*/;
 }
 
-div.TreeDropdownField div.tree_holder ul.tree a {
+div.TreeDropdownField .panel.loading {
+	background: #f00;
+}
+
+div.TreeDropdownField .panel ul.tree a {
 	font-size: 12px;
 }
 
-div.TreeDropdownField div.tree_holder ul.tree {
+div.TreeDropdownField .panel ul.tree {
 	margin-top: 0;
 }
 
-html>body div.TreeDropdownField div.tree_holder {
-	top: 20px;
-	left: 0px;
-	z-index: 1000;
-}
-
-/**
- * HACK IE6, see http://www.hedgerwow.com/360/bugs/css-select-free.html
- */
-div.TreeDropdownField div.tree_holder iframe {
-	display:none;/* IE5*/
-	display/**/:block;/* IE5*/
-	position:absolute;
-	border-style: none;
-	top:0;
-	left:0;
-	z-index:-1;
-	filter:mask();
-	width:31em;/*must have for any big value*/
-	height:200px/*must have for any big value*/;
-	border: none;
-}
-
 div.TreeDropdownField a.editLink {
 	border:none;
 	text-decoration: none;
diff --git a/forms/TreeDropdownField.php b/forms/TreeDropdownField.php
index 8423b59aa..605df3597 100755
--- a/forms/TreeDropdownField.php
+++ b/forms/TreeDropdownField.php
@@ -115,16 +115,13 @@ class TreeDropdownField extends FormField {
 	public function Field() {
 		Requirements::add_i18n_javascript(SAPPHIRE_DIR . '/javascript/lang');
 		
-		Requirements::javascript(SAPPHIRE_DIR . '/thirdparty/prototype/prototype.js');
-		Requirements::javascript(SAPPHIRE_DIR . '/thirdparty/behaviour/behaviour.js');
 		Requirements::javascript(SAPPHIRE_DIR . '/thirdparty/jquery/jquery.js');
 		Requirements::javascript(SAPPHIRE_DIR . '/javascript/jquery_improvements.js');
-		Requirements::javascript(SAPPHIRE_DIR . '/javascript/tree/tree.js');
-		// needed for errorMessage()
-		Requirements::javascript(SAPPHIRE_DIR . '/javascript/LeftAndMain.js');
-		Requirements::javascript(SAPPHIRE_DIR . '/javascript/TreeSelectorField.js');
+		Requirements::javascript(SAPPHIRE_DIR . '/thirdparty/jquery-entwine/dist/jquery.entwine-dist.js');
+		Requirements::javascript(SAPPHIRE_DIR . '/thirdparty/jstree/jquery.jstree.js');
+		Requirements::javascript(SAPPHIRE_DIR . '/javascript/TreeDropdownField.js');
 		
-		Requirements::css(SAPPHIRE_DIR . '/javascript/tree/tree.css');
+		Requirements::css(SAPPHIRE_DIR . '/thirdparty/jquery-ui-themes/smoothness/jquery.ui.all.css');
 		Requirements::css(SAPPHIRE_DIR . '/css/TreeDropdownField.css');
 	
 		if($this->Value() && $record = $this->objectForKey($this->Value())) {
@@ -138,7 +135,7 @@ class TreeDropdownField extends FormField {
 			array (
 				'id'    => "TreeDropdownField_{$this->id()}",
 				'class' => 'TreeDropdownField single' . ($this->extraClass() ? " {$this->extraClass()}" : ''),
-				'href' => $this->form ? $this->Link() : "",
+				'href' => $this->form ? $this->Link('tree') : "",
 			),
 			$this->createTag (
 				'input',
@@ -152,7 +149,7 @@ class TreeDropdownField extends FormField {
 					$this->createTag(
 						'input',
 						array(
-							'class' => 'items',
+							'class' => 'title',
 							'value' => '(Choose or type search)' 
 						)
 					) :
@@ -197,7 +194,8 @@ class TreeDropdownField extends FormField {
 
 		$this->search = Convert::Raw2SQL($request->getVar('search'));
 
-		if($ID = (int) $request->latestparam('ID')) {
+		$ID = (is_numeric($request->latestparam('ID'))) ? (int)$request->latestparam('ID') : (int)$request->requestVar('ID');
+		if($ID) {
 			$obj       = DataObject::get_by_id($this->sourceObject, $ID);
 			$isSubTree = true;
 			
@@ -232,15 +230,15 @@ class TreeDropdownField extends FormField {
 				$obj->markToExpose($this->objectForKey($value));
 			}
 		}
-		
-		$eval = '"<li id=\"selector-' . $this->Name() . '-{$child->' . $this->keyField . '}\" class=\"$child->class"' .
+
+		$eval = '"<li id=\"selector-' . $this->Name() . '-{$child->' . $this->keyField . '}\" data-id=\"$child->' . $this->keyField . '\" class=\"$child->class"' .
 				' . $child->markingClasses() . "\"><a rel=\"$child->ID\">" . $child->' . $this->labelField . ' . "</a>"';
 		
 		if($isSubTree) {
 			return substr(trim($obj->getChildrenAsUL('', $eval, null, true)), 4, -5);
+		} else {
+			return $obj->getChildrenAsUL('class="tree"', $eval, null, true);
 		}
-		
-		return $obj->getChildrenAsUL('class="tree"', $eval, null, true);
 	}
 
 	/**
diff --git a/javascript/TreeDropdownField.js b/javascript/TreeDropdownField.js
index da0042b1a..8e52ff84d 100644
--- a/javascript/TreeDropdownField.js
+++ b/javascript/TreeDropdownField.js
@@ -1,40 +1,22 @@
 (function($) {
 	$.entwine('ss', function($){
 		
-		var strings = {
-			'openlink': 'Open',
-			'fieldTitle': '(choose)',
-			'searchFieldTitle': '(choose or search)'
-		};
-		
 		/**
-		 * @todo Error display
-		 * @todo No results display for search
-		 * @todo Automatic expansion of ajax children when multiselect is triggered
-		 * @todo Automatic panel positioning based on available space (top/bottom)
-		 * @todo forceValue
-		 * @todo Automatic width
-		 * @todo Expand title height to fit all elements
+		 * @todo Locale support
+		 * @todo Multiselect
+		 * @todo Search
 		 */
 		$('.TreeDropdownField').entwine({
 			onmatch: function() {
-				this.append(
-					'<span class="title"></span>' +
-					'<a href="#" title="' + strings.openLink + '" class="toggle-panel-link"></a>' +
-					'<div class="panel"><div class="tree-holder"></div></div>'
-				);
-				if(this.data('title')) this.setTitle(this.data('title'));
-			this.getPanel().hide();
-				
-				this._super();
+				this.append('<div class="panel"><div class="tree-holder"></div></div>');
 			},
 			getPanel: function() {
 				return this.find('.panel');
 			},
 			openPanel: function() {
-				var panel = this.getPanel(), tree = this.find('.tree-holder');
+				var panel = this.getPanel();
 				panel.show();
-				if(tree.is(':empty')) this.loadTree();
+				if(!panel.find('li').length) this.loadTree();
 			},
 			closePanel: function() {
 				this.getPanel().hide();
@@ -43,55 +25,40 @@
 				this[this.getPanel().is(':visible') ? 'closePanel' : 'openPanel']();
 			},
 			setTitle: function(title) {
-				if(!title) title = strings.fieldTitle;
-					
 				this.find('.title').text(title);
-				this.data('title', title); // separate view from storage (important for search cancellation)				
 			},
 			getTitle: function() {
 				return this.find('.title').text();
 			},
 			setValue: function(val) {
-				this.find(':input:hidden').val(val);
+				this.find(':input').val(val);
 			},
 			getValue: function() {
-				return this.find(':input:hidden').val();
+				return this.find(':input').val();
 			},
-			loadTree: function(params, callback) {
-				var self = this, panel = this.getPanel(), treeHolder = $(panel).find('.tree-holder');
-				var params = (params) ? this.getRequestParams().concat(params) : this.getRequestParams();
-				panel.addClass('loading');
-				treeHolder.load(this.data('url-tree'), params, function(html, status, xhr) {
-					var firstLoad = true;
+			loadTree: function() {
+				var self = this, treeHolder = $(this.getPanel()).find('.tree-holder');
+				this.addClass('loading');
+				treeHolder.load(this.attr('href'), {}, function(html, status, xhr) {
 					if(status == 'success') {
 						$(this)
 							.bind('loaded.jstree', function(e, data) {
 								var val = self.getValue();
 								if(val) data.inst.select_node(treeHolder.find('*[data-id=' + val + ']'));
-								firstLoad = false;
-								if(callback) callback.apply(self);
 							})
 							.jstree(self.getTreeConfig())
 							.bind('select_node.jstree', function(e, data) {
-								var node = data.rslt.obj, id = $(node).data('id');
-								if(self.getValue() == id) {
-									self.setValue(null);
-									self.setTitle(null);
-								} else {
-									self.setValue(id);
-									self.setTitle(data.inst.get_text(node));
-								}
-								
-								// Avoid auto-closing panel on first load
-								if(!firstLoad) self.closePanel();
+								var node = data.rslt.obj;
+								self.setValue($(node).data('id'));
+								self.setTitle(data.inst.get_text(node));
+								self.closePanel();
 							});
 					}
 					
-					panel.removeClass('loading');
+					self.removeClass('loading');
 				});
 			},
 			getTreeConfig: function() {
-				var self = this;
 				return {
 					'core': {
 						'initially_open': ['record-0'],
@@ -101,11 +68,9 @@
 						// TODO Hack to avoid ajax load on init, see http://code.google.com/p/jstree/issues/detail?id=911
 						'data': this.getPanel().find('.tree-holder').html(),
 						'ajax': {
-							'url': this.data('url-tree'),
+							'url': this.attr('href'),
 							'data': function(node) {
-								var id = $(node).data("id") ? $(node).data("id") : 0, params = self.getRequestParams();
-								params = params.concat([{name: 'ID', value: id}, {name: 'ajax', value: 1}]);
-								return params;
+								return { ID : $(node).data("id") ? $(node).data("id") : 0 , ajax: 1};
 							}
 						}
 					},
@@ -113,20 +78,11 @@
 						"select_limit" : 1,
 						'initially_select': [this.getPanel().find('.current').attr('id')]
 					},
+					'themes': {
+						'theme': 'apple'
+					},
 					'plugins': ['html_data', 'ui', 'themes']
-					// 'plugins': ['html_data', 'ui', 'themeroller']
 				};
-			},
-			/**
-			 * If the field is contained in a form, submit all form parameters by default.
-			 * This is useful to keep state like locale values which are typically
-			 * encoded in hidden fields through the form.
-			 * 
-			 * @return {array}
-			 */
-			getRequestParams: function() {
-				var form = this.parents('form');
-				return form.length ? form.serializeArray() : [];
 			}
 		});
 		$('.TreeDropdownField *').entwine({
@@ -134,103 +90,9 @@
 				return this.parents('.TreeDropdownField:first');
 			}
 		});
-		$('.TreeDropdownField .toggle-panel-link, .TreeDropdownField span.title').entwine({
+		$('.TreeDropdownField .editLink').entwine({
 			onclick: function(e) {
 				this.getField().togglePanel();
-				return false;
-			}
-		});
-		
-		$('.TreeDropdownField.searchable').entwine({
-			onmatch: function() {
-				this._super();
-				
-				var title = this.data('title');
-				this.find('.title').replaceWith(
-					$('<input type="text" class="title search" />')
-				);
-				this.setTitle(title ? title : strings.searchFieldTitle);
-			},
-			setTitle: function(title) {
-				if(!title) title = strings.fieldTitle;
-				
-				this.find('.title').val(title);
-			},
-			getTitle: function() {
-				return this.find('.title').val();
-			},
-			search: function(str, callback) {
-				this.openPanel();
-				this.loadTree({search: str}, callback);
-			},
-			cancelSearch: function() {
-				this.closePanel();
-				this.loadTree();
-				this.setTitle(this.data('title'));
-			}
-		});
-		
-		$('.TreeDropdownField.searchable input.search').entwine({
-			onkeydown: function(e) {
-				var field = this.getField();
-				if(e.keyCode == 13) {
-					// trigger search on ENTER key
-					field.search(this.val());
-					return false;
-				} else if(e.keyCode == 27) {
-					// cancel search on ESC key
-					field.cancelSearch();
-				}
-			}
-		});
-		
-		$('.TreeDropdownField.multiple').entwine({
-			getTreeConfig: function() {
-				var cfg = this._super();
-				cfg.checkbox = {override_ui: true};
-				cfg.plugins.push('checkbox');
-				cfg.ui.select_limit = -1;
-				return cfg;
-			},
-			loadTree: function(params, callback) {
-				var self = this, panel = this.getPanel(), treeHolder = $(panel).find('.tree-holder');
-				var params = (params) ? this.getRequestParams().concat(params) : this.getRequestParams();
-				panel.addClass('loading');
-				treeHolder.load(this.data('url-tree'), params, function(html, status, xhr) {
-					var firstLoad = true;
-					if(status == 'success') {
-						$(this)
-							.bind('loaded.jstree', function(e, data) {
-								$.each(self.getValue(), function(i, val) {
-									data.inst.check_node(treeHolder.find('*[data-id=' + val + ']'));
-								});
-								firstLoad = false;
-								if(callback) callback.apply(self);
-							})
-							.jstree(self.getTreeConfig())
-							.bind('uncheck_node.jstree check_node.jstree', function(e, data) {
-								var nodes = data.inst.get_checked(null, true);
-								self.setValue($.map(nodes, function(el, i) {
-									return $(el).data('id');
-								}));
-								self.setTitle($.map(nodes, function(el, i) {
-									return data.inst.get_text(el);
-								}));
-							});
-					}
-					
-					panel.removeClass('loading');
-				});
-			},
-			getValue: function() {
-				var val = this._super();
-				return val.split(/ *, */);
-			},
-			setValue: function(val) {
-				this._super($.isArray(val) ? val.join(',') : val);
-			},
-			setTitle: function(title) {
-				this._super($.isArray(title) ? title.join(', ') : title);
 			}
 		});
 	});
diff --git a/javascript/TreeSelectorField.js b/javascript/TreeSelectorField.js
deleted file mode 100755
index 6a4403ead..000000000
--- a/javascript/TreeSelectorField.js
+++ /dev/null
@@ -1,438 +0,0 @@
-/**
- * TreeDropdownField.js
- */
-TreeDropdownField = Class.extend('Observable');
-TreeDropdownField.prototype = {
-	initialize: function() {
-		// Hook up all the fieldy bits
-		this.editLink = this.getElementsByTagName('a')[0];
-		if (this.getElementsByTagName('span').length > 0) {
-			// no search, humanItems is a span
-			this.humanItems = this.getElementsByTagName('span')[0];
-			this.inputTag = this.getElementsByTagName('input')[0];
-		}
-		else {
-			// search is present, humanItems is an input
-			this.inputTag = this.getElementsByTagName('input')[0];
-			this.humanItems = this.getElementsByTagName('input')[1];
-			this.humanItems.onkeyup = this.search_onkeyup;
-		}
-		this.editLink.treeDropdownField = this;
-		this.humanItems.treeDropdownField = this;
-		this.inputTag.treeDropdownField = this;
-		
-		this.editLink.onclick = this.edit_click;
-		this.humanItems.onclick = this.human_click;
-		this.inputTag.setValue = this.setValue.bind(this);
-	},
-
-	destroy: function() {
-		if(this.editLink) {
-			this.editLink.onclick = null;
-			this.editLink.treeDropdownField = null;
-			this.editLink = null;
-		}
-		if(this.humanItems) {
-			this.humanItems.onclick = null;
-			this.humanItems.treeDropdownField = null;
-			this.humanItems = null;
-		}
-		if(this.inputTag) {
-			this.inputTag.setValue = null;
-			this.inputTag.treeDropdownField = null;
-			this.inputTag = null;
-		}
-	},
-	
-	getName: function() {
-		return this.inputTag.name;
-	},
-	
-	refresh: function() {
-		this.createTreeNode();
-		
-		this.ajaxGetTree( (function(response) {
-			this.newTreeReady(response, false);
-			this.updateTreeLabel();
-		}).bind(this));
-	},
-	
-	// Build a URL from the field's base URL and the given sub URL
-	buildURL: function(subURL) {
-		var baseURL = jQuery(this).attr('href');
-		if (!baseURL) {
-			// Occurs if treedropdown has no form e.g. treefields in widget areas.
-			baseURL = this.ownerForm().action + '/field/' + this.getName() + '/';
-			var baseTags = document.getElementsByTagName('base');
-			var base = (baseTags) ? baseTags[0].href : '';
-			if (base == baseURL.substring(0, base.length))
-				baseURL = baseURL.substring(base.length);
-		}
-		var subHasQuerystring = subURL.match(/\?/);
-		
-		if(baseURL.match(/^(.*)\?(.*)$/)) {
-			if(subHasQuerystring) return RegExp.$1 + '/' + subURL + '&' + RegExp.$2
-			else return RegExp.$1 + '/' + subURL + '?' + RegExp.$2
-		} else {
-			return baseURL + '/' + subURL;
-		}
-	},
-	ownerForm: function() {
-		var f =this.parentNode;
-		while(f && f.tagName.toLowerCase() != 'form') f = f.parentNode;
-		return f;
-	},
-	
-	toggleTree: function() {
-		if(this.treeShown) this.hideTree();
-		else this.showTree();
-	},
-	
-	createTreeNode: function(keepTreeHidden) {
-		if(!this.itemTree) {
-			this.itemTree = document.createElement('div');
-			
-			if(keepTreeHidden) {
-				this.hideTree();
-			}
-			
-			this.itemTree.className = 'tree_holder';
-			this.itemTree.innerHTML = ss.i18n._t('LOADING', 'Loading...');
-			this.appendChild(this.itemTree);
-		}
-	},
-
-	deleteTreeNode: function() {
-		if (!this.itemTree) return;
-		var parent = this.itemTree.parentNode;
-		parent.removeChild(this.itemTree);
-		this.itemTree = null;
-	},
-
-	showTree: function () {
-		if (!this.treeShown) this.saveCurrentState();
-		this.treeShown = true;
-		
-		if(this.itemTree) {
-			this.itemTree.style.display = 'block';
-			// Store this in a parameter so that stopObserving works
-			this.bound_testForBlur = this.testForBlur.bind(this);
-			Event.observe(document, 'click', this.bound_testForBlur);
-			this.stretchIframeIfNeeded();
-		} else {
-			this.createTreeNode();
-			
-			this.ajaxGetTree( (function(response) {
-				this.newTreeReady(response, false);
-				this.updateTreeLabel();
-			}).bind(this));
-		}
-	},
-	
-	saveCurrentState: function() {
-		this.origHumanText = this.getHumanText();
-	},
-
-	restoreOriginalState: function() {
-		this.setHumanText(this.origHumanText);
-	},
-
-	/**
-	 * If this control is inside an iframe, stretch the iframe out to fit the tree.
-	 */
-	stretchIframeIfNeeded: function() {
-		if(parent && parent.document) {
-			if(!this.iframeObj) {
-				var iframes = parent.document.getElementsByTagName('iframe')
-				var i,item;
-				for(i=0;item=iframes[i];i++) {
-					if(item.contentWindow == window) {
-						this.iframeObj = item;
-						break;
-					}
-				}
-			}
-			
-			// This iframe stretching doesn't work with the greybox
-			if(this.iframeObj && this.iframeObj.id == 'GB_frame') return;
-			
-			var desiredHeight = Position.cumulativeOffset(this.itemTree)[1] + this.itemTree.offsetHeight + 2;
-			if(this.iframeObj && desiredHeight > this.iframeObj.offsetHeight) {
-				this.iframeObj.oldHeight = this.iframeObj.offsetHeight;
-				this.iframeObj.style.height = desiredHeight + 'px';
-			}
-		}
-	},
-	
-	unstretchIframeIfNeeded: function() {
-		if(this.iframeObj && this.iframeObj.oldHeight)
-			this.iframeObj.style.height = this.iframeObj.oldHeight + 'px';
-	},
-	
-	testForBlur: function (event) {
-		var clicked = Event.element(event);
-		if(clicked != this.itemTree && !hasAncestor(clicked, this.itemTree) && clicked != this.editLink && clicked != this.humanItems) {
-			this.hideTree();
-		}
-	},
-		
-	hideTree: function() {
-		this.treeShown = false;
-		if(this.itemTree) {
-			this.itemTree.style.display = 'none';
-			if(this.bound_testForBlur) Event.stopObserving(document, 'click', this.bound_testForBlur);
-			// this.editLink.style.display = this.humanItems.style.display = 'block';
-			this.unstretchIframeIfNeeded();
-		}
-		// this.style.position = '';
-	},
-	
-	ajaxGetTree: function(after) {
-		var ajaxURL = this.buildURL('tree?forceValue=' + this.inputTag.value); 
-		var secId = jQuery(':input[name=SecurityID]');
-		ajaxURL += secId.length ? '&SecurityID=' + secId.val() : '';
-		var localeField = jQuery(this.ownerForm()).find(':input[name=locale],:input[name=Locale]');
-		if(localeField.length) {ajaxURL += "&locale=" + localeField.val();}
-		if(this.inputTag.value) ajaxURL += '&forceValue=' + this.inputTag.value;
-		if(this.search() != null) ajaxURL += "&search=" + this.search(); 
-		jQuery.ajax({
-			'url': ajaxURL,
-			'method' : 'get', 
-			'success' : after,
-			'error' : function(response) { errorMessage("Error getting data", response); }
-		});
-	},
-
-	search: function() {
-		if (this.humanItems.nodeName != 'INPUT' || !this.searched) return null;
-		return this.humanItems.value;
-	},
-
-	/**
-	 * Called once the tree has been delivered from ajax
-	 */
-	newTreeReady: function (response, keepTreeHidden) {
-		this.itemTree.innerHTML = response.responseText;
-		// HACK IE6: see http://www.hedgerwow.com/360/bugs/css-select-free.html
-		this.itemTree.appendChild(document.createElement('iframe'));
-		this.tree = Tree.create(this.itemTree.getElementsByTagName('ul')[0], { 
-			ajaxExpansion: this.ajaxExpansion, 
-			getIdx: function() {
-				return this.getElementsByTagName('a')[0].getAttribute('rel');
-			},
-			idxBase : 'selector-' + this.getName() + '-',
-			dropdownField : this,
-			onselect : this.tree_click
-		});
-
-		// Select the appropriate items
-		var selectedItems = this.inputTag.value.split(/ *, */);
-		var i, isSelected = {};
-		for(i=0;i<selectedItems.length;i++) isSelected[selectedItems[i]] = true;
-		
-		if(!keepTreeHidden) {
-			this.showTree();
-		}
-	},
-
-	/**
-	 * Expander bound to each tree node
-	 */
-	ajaxExpansion: function() {
-		this.addNodeClass('loading');
-		var ul = this.treeNodeHolder();
-		ul.innerHTML = ss.i18n._t('LOADING', 'Loading...');
-		
-		var ajaxURL = this.options.dropdownField.buildURL('tree/' + this.getIdx());
-		ajaxURL += $('SecurityID') ? '&SecurityID=' + $('SecurityID').value : '';
-		if($('Form_EditForm_Locale')) ajaxURL += "&locale=" + $('Form_EditForm_Locale').value;
-		// ajaxExpansion is called in context of TreeNode, not Tree, so search() doesn't exist.
-		if (this.search && this.search() != null) ajaxURL += "&search=" + this.search();
-		
-		jQuery.ajax({
-			'url': ajaxURL, 
-			'success' : this.installSubtree.bind(this),
-			'error' : function(response) { errorMessage('error loading subtree', response); }
-		});
-	},
-	
-	setValue: function(val) {
-		this.inputTag = this.getElementsByTagName('input')[0];
-
-		if(this.inputTag.value != val) {
-			this.inputTag.value = val;
-			jQuery(this).trigger('ss.TreeDropdownField.change', {val: val});
-			this.notify('Change', val);
-			
-			// If the tree item is already downloaded, just update the label
-			if($('selector-' + this.getName() + '-' + this.inputTag.value)) {
-				this.updateTreeLabel();
-				
-			// Otherwise, update the tree with ajax
-			} else {
-				this.ajaxGetTree( (function(response) {
-					this.createTreeNode(true);
-					this.newTreeReady(response, true);
-					this.updateTreeLabel();
-				}).bind(this));
-			}
-		}
-	},
-
-	updateTreeLabel: function() {
-		if ( this.searched || (this.humanItems.nodeName == 'INPUT' && !this.inputTag.value) ) return; // don't update the search
-		var treeNode;
-		if(treeNode = $('selector-' + this.getName() + '-' + this.inputTag.value)) {
-			this.setHumanText(treeNode.getTitle());
-
-			if(treeNode.tree.selected && treeNode.tree.selected.removeNodeClass) treeNode.tree.selected.removeNodeClass('current');
-			treeNode.addNodeClass('current');
-			this.tree.selected = treeNode;
-			
-		} else {
-			this.setHumanText(this.inputTag.value ? this.inputTag.value : '(Choose)');
-		}
-	},
-
-	getHumanText: function() {
-		return this.humanItems.nodeName == 'INPUT' ? this.humanItems.value : this.humanItems.innerHTML;
-	},
-
-	setHumanText: function (s) {
-		if (this.humanItems.nodeName == 'INPUT')
-			this.humanItems.value = s;
-		else
-			this.humanItems.innerHTML = s;
-	},
-
-	setValueFromTree: function(treeID, title) {
-		this.setHumanText(title);
-		this.inputTag.value = treeID.replace('selector-' + this.getName() + '-','');
-		jQuery(this).trigger('ss.TreeDropdownField.change', {val: this.inputTag.value});
-		this.notify('Change', this.inputTag.value);
-
-		this.hideTree();
-	},
-	
-	edit_click : function() {
-		if (this.treeDropdownField.treeShown) this.treeDropdownField.restoreOriginalState();
-		this.treeDropdownField.toggleTree();
-		return false;
-	},
-
-	search_onkeyup: function(e) {
-		if(typeof window.event!="undefined") e=window.event; //code for IE
-		if (e.keyCode == 27) { // esc, cancel the selection and hide the tree.
-			this.treeDropdownField.restoreOriginalState();
-			this.treeDropdownField.hideTree();
-		}
-		else {
-			var that = this;
-			clearTimeout(this.timeout);
-			this.timeout = setTimeout(function() {
-				that.treeDropdownField.searched = true;
-				that.treeDropdownField.deleteTreeNode();
-				that.treeDropdownField.showTree();
-			}, 750);
-		}
-	},
-
-	human_click: function() {
-		if (this.treeDropdownField.humanItems.nodeName != 'INPUT') {
-			if (this.treeDropdownField.treeShown) this.treeDropdownField.restoreOriginalState();
-			this.treeDropdownField.toggleTree();
-			return false;
-		}
-		
-		if (!this.treeDropdownField.treeShown) this.treeDropdownField.toggleTree();
-		if (!this.treeDropdownField.defaultCleared || !this.treeDropdownField.searched) {
-			this.treeDropdownField.defaultCleared = true;
-			this.treeDropdownField.setHumanText('');
-		}
-		
-		return false;
-	},
-
-	tree_click : function() {
-		this.options.dropdownField.setValueFromTree(this.id, this.getTitle());
-
-		if(this.tree.selected && this.tree.selected.removeNodeClass) this.tree.selected.removeNodeClass('current');
-		this.addNodeClass('current');
-		this.tree.selected = this;
-		
-		this.options.dropdownField.searched = false;
-	}
-}
-
-TreeMultiselectField = Class.extend('TreeDropdownField');
-TreeMultiselectField.prototype = {
-	destroy: function() {
-		if(this.TreeDropdownField) this.TreeDropdownField.destroy();
-		this.TreeDropdownField = null;
-	},
-	
-	newTreeReady: function (response) {
-		this.TreeDropdownField.newTreeReady(response);
-		MultiselectTree.create(this.tree);
-		this.tree.options.onselect = this.updateVal.bind(this);
-	
-		// Select the appropriate items
-		var selectedItems = this.inputTag.value.split(/ *, */);
-		var i, isSelected = {};
-		for(i=0;i<selectedItems.length;i++) isSelected[selectedItems[i]] = true;
-
-		var allNodes = this.tree.getElementsByTagName('li');
-		
-		for(i=0;i<allNodes.length;i++) {
-			allNodes[i].id.match(/([^-]+)-(\d+)$/);
-			var idx = RegExp.$2
-			if(isSelected[idx]) {
-				this.tree.selectNode(allNodes[i]);
-				allNodes[i].expose();
-			}
-		}
-	},
-	
-	hideTree: function() {
-		this.TreeDropdownField.hideTree();
-		if(this.tree) this.updateVal();
-	},
-
-	/**
-	 * Update the inputTag and humanItems from the currently selected nodes.
-	 */
-	updateVal: function() {
-		var internalVal = humanVal = ""; 
-		
-		for(i in this.tree.selectedNodes) {
-			internalVal += (internalVal?',':'') + i;
-			humanVal += (humanVal?', ':'') + this.tree.selectedNodes[i];
-		}
-		
-		this.inputTag.value = internalVal;
-		this.setHumanText(humanVal);
-	},
-
-	updateTreeLabel: function() {
-		var treeNode;
-		
-		if(this.inputTag.value) {
-			var innerHTML = '';
-			var selectedItems = this.inputTag.value.split(/ *, */);
-			for(i=0;i<selectedItems.length;i++) {
-				if(treeNode = $('selector-' + this.getName() + '-' + selectedItems[i])) {
-					innerHTML += (innerHTML?', ':'') + treeNode.getTitle();
-				} else {
-					innerHTML += selectedItems[i];
-				}
-			}
-			this.setHumanText(innerHTML);
-		} else {
-			this.setHumanText('(Choose)');
-		}
-	}
-
-}
-
-TreeMultiselectField.applyTo('div.TreeDropdownField.multiple');
-TreeDropdownField.applyTo('div.TreeDropdownField.single');