function TreeElement() {
	this.id;
	this.parent;
	this._tree;
	this.caption;
	this.url;
	this.target;
	this.linkStyle;
	this.divStyle;
	this.onClick;
	this.isOpen = false;
	this.visible = true;
	this.isChecked = 0;
	this.checkboxName;
	this.radioButtonSelected;
	this._checkboxObject;
	this._level = 0;
	this._children = new Array;
	this._undoneChildren;
	this.imageDir;
	this.imageHeight;
	this.icon;
	this.beforeIconSpan;
	this.beforeCaptionSpan;
	this.afterCaptionSpan;
	this.dataContainer;
	this._attachedEvents;
	this._isOutrendered = false;
	this._errorArray;
	this.getThis = function() {
		return this;
	}
	
	// addChild function
	this.addChild = function(treeElement) {
		treeElement.parent = this;
		if (typeof(this._children) != 'object')
			this._children = new Array;
		if (this._children.push) {
			this._children.push(treeElement);
		} else {
			this._children[this._children.length] = treeElement;
		}
		treeElement._level = this._level + 1;
		this._updateLevelAndParent(treeElement);
		this._tree._clearingHouse[treeElement.id] = treeElement;
		if (this._isOutrendered) {
			this.render(true, true);
		}
	}
	
	// addChildByArray function
	this.addChildByArray = function(elementData) {
		var treeElement = this._tree._createTreeElement(elementData);
		this.addChild(treeElement);
		return treeElement;
	}
	
	// isChild function
	this.isChild = function(elementId, bubble) {
		for (var i = 0; i < this._children.length; i++) {
			if (this._children[i].id == elementId)
				return true;
			if (bubble) {
				if (this._children[i].isChild(elementId, true))
					return true;
			}
		}
		return false;
	}
	
	// setCaptio function
	this.setCaption = function(caption) {
		this.caption = caption;
		if (this._isOutrendered) {
			var span =
				document.getElementById(
					this._tree._objectId + '_e_'+this.id + '_caption2');
			if (span)
				span.innerHTML = caption;
		}
	}
	
	// reder function
	this.render = function(omitDivTags, putIntoPage, lookAhead) {
		if (typeof(this._tree.stopWatch) == 'object')
			this._tree.stopWatch.takeTime('TreeElement.render() for id : ' + this.id + 'in level : '+ this._level);
			if (typeof(lookAhead) == 'undefined') {
				lookAhead = this._tree.lookAhead; 
			}
		if ((this._tree._pseudoElement == this)
			&& !this._tree.showPseudoElement
			&& (lookAhead != -1)) {
			lookAhead++; 
		}
		
		var imageDir = this._getVar('imageDir');
		var imageHeight = this._getVar('imageHeight');
		var out = new Array();
		var outI = 0;
		var evalStr = '';
		if (!omitDivTags) {
			out[outI++] ='<span id="'+this._tree._objectId + '_e_'+this.id + '"';
			out[outI++] = ' style="';
			if (!this.visible) {
				out[outI++] = 'display:none;';
			}
			out[outI++] = '">';
		}
		if ((this._level) > 0 || (this._tree.showPseudoElement)) {
			out[outI++] = '<nobr>';
			out[outI++] ='<div style="float:none;"';                 // start an individual node display
			out[outI++] = 'id =	"' + this._tree._objectId + '_e_' + this.id + '_drag" ';
			if ( this._tree.draggable) {
				out[outI++] =' onDragStart ="Objects['+this._tree._id+'].executeOnElement(\'' 
					+ this.id + '\', \'fireEvent\', Array(\'onDragStart\'));" ';
				out[outI++] = 'onDragEnter ="Objects['+this._tree._id+'].executeOnElement(\'' 
					+ this.id + '\', \'fireEvent\', Array(\'onDragEnter\'));" ';
				out[outI++] = 'onDragOver ="Objects['+this._tree._id+'].executeOnElement(\'' + this.id + '\', \'fireEvent\', Array(\'onDragOver\'));" ';
				out[outI++] = 'onDrop ="Objects['+this._tree._id+'].executeOnElement(\'' 
					+ this.id + '\', \'fireEvent\', Array(\'onDrop\'));" ';
             }
			out[outI++] = '>';
			out[outI++] ='<div style ="overflow:visible; height:' + imageHeight + '; ' 
				+ this._getVar('divStyle') + '"> ';
			var level =	this._level;
			
		if (!this._tree.showPseudoElement)
			--level;
			
		var obj = null;
		var outTemp = '';
		for (var i = 0; i < level; i++) {
			if (!obj) {
				obj = this.parent;
			} else {
				obj = obj.parent;
			}
			if (obj.hasSiblingsDown()) {
				var img = 'line1';
			} else {
				var img = 'empty';
			}
			outTemp = '<img src="'
					+ imageDir
					+ img
					+ '.gif" height="'
					+ imageHeight
					+ '"border ="0" align = "top" > ' +outTemp;
		} //end for 
		out[outI++] = outTemp;
		
		if (this.hasSiblingsDown()) {
			var imgNumber = 3;
		} else {
			var imgNumber = 2;
		}
		
		if (this.hasVisibleChildren()) {
			if ((this._level == 0) || (!this._tree.showPseudoElement 
				&& (this._level == 1) 
				&& ((this._tree.useAutoSequence && (this.id == 1))
				|| (!this._tree.useAutoSequence && true)))) {
				if (this.hasSiblingsDown()) {
					imgNumber++;
				} else {
					imgNumber--;
				}
			}			
			if (this.isOpen) {
				var plusImg = 'minus'+imgNumber;
				var onClick = 'Close';
			} else {
				var plusImg = 'plus'+imgNumber;
				var onClick = 'Open';
			}
		} else {
			var plusImg = 'line'+imgNumber;
			var onClick = false;
		} // end if hasVisibleChildren
		
		
		if (onClick) {
			var onClickStr = 'onClick="Objects['+this._tree._id+'].elementToggleOpenClose(\'' + this.id + '\');"';} 
		else {
			var onClickStr = '';
		}
		if (this.onClick) {
			var onClick = this.onClick;        
			onClick = onClick.replace(/__this\.id__/g, this.id); 
			//replace the string __this.id__ with the actual id (int).
			out[outI++] = '<span style="cursor:pointer; cursor:hand;" onClick="' + onClick + '">';
		}
		out[outI++] =
			'<img id="'
				+ this._tree._objectId
				+ '_e_'
				+ this.id
				+ '_openClose" src="'
				+ imageDir
				+ plusImg
				+ '.gif" height="'
				+ imageHeight
				+ '" border="0" '
				+ onClickStr
				+ ' align="middle"';
		out[outI++] =' style ="vertical-align:' + ((imageHeight > 16) ? 'middle' : 'top') + '"> ';
		
		if (this.beforeIconSpan) {
			out[outI++] = "<span>" + this.beforeIconSpan + "</span>";
		}
		
		if (this.url) {
			var hRef = '<a class="tree" href="'+this.url + '"';
			if (this.target) {
				hRef += ' target="'+this.target + '"';
				hRef += ' style="'+this._getLinkStyle() + '"';
			}
			hRef += '>';
		}
		
		var folderIconId = this._tree._objectId + '_e_'+this.id + '_folder';
		if (this._getVar('useFolderIcon')) {
			if (hRef)
				out[outI++] = hRef;
				
				switch (typeof(this.icon)) {
				case 'undefined':
					if (this._tree.useLeaf && !this.hasChildren()) {
						var folderImg = 'leaf';
					} else {
						var folderImg = 'folder';
						folderImg += (this.isOpen) ? 'Open': 'Closed';
					}
					out[outI++] =
						'<img id="'
							+ folderIconId
							+ '" src="'
							+ imageDir
							+ folderImg
							+ '.gif" height="'
							+ imageHeight
							+ '"border ="0" align =	"top"> ';
					break;
				case 'bool ':
				case 'boolean':
					break;
				case 'string':
					if (this.icon != 'false') {
						out[outI++] = '<img id="'+folderIconId + '" src="';
						if (!this._iconHasPath(this.icon))
							out[outI++] = imageDir;
						out[outI++] = this.icon;
						if (!this._iconHasExtension(this.icon))
							out[outI++] = '.gif';
						out[outI++] ='" height="'+imageHeight + '"border ="0" align = "top" > ';}
					}
					if (hRef)
						out[outI++] = '</a>';
		}// end if _getVar('useFolderIcon')
		
		if (this.beforeCaptionSpan) {
			out[outI++] = "<span>" + this.beforeCaptionSpan + "</span>";
		}	
			
		if (this._tree.useRadioButton) {
			out[outI++] = '<input type="radio"';
			if (this._tree.radioButtonName) {
				out[outI++] = ' name="'+this._tree.radioButtonName + '"';
			} else {
				out[outI++] =' name="'+ 'bsTreeRad_'+this._tree._objectId + '"';
			}
			if (true) {
				out[outI++] = ' style = "height:16px;" ';
			}
			if (this.radioButtonSelected) {
				out[outI++] = ' checked';
			}
			out[outI++] = '>';
		}// end if useRadioButton
		
		if (this._tree.useCheckboxSystem) {
			var checkboxSpan = this.checkboxName + 'Span';
			var checkboxObj = this.checkboxName + 'Obj';
			out[outI++] = '&nbsp;<span id="'+checkboxSpan + '">';
			var t = new Checkbox();
			t.objectName = checkboxObj;
			t.checkboxName = this.checkboxName;
			t.value = this.isChecked;
			
			if (this._getVar('checkboxSystemGuiNochange ')) {
				t.guiNochange = true; 
			}
			
			var chkImagDir = this._getVar('checkboxSystemImgDir');
			if (chkImagDir) {
				t.imgDir = chkImagDir; 
			} else {
				t.imgDir ="/_bsJavascript/components/checkbox/img/win2k_noBorder/";
			}
			
			//t.imgWidth = '13';
			//t.imgHeight = '13';
			
			if (this._tree.checkboxSystemWalkTree) {
				t.attachOnClick('Objects['+this._tree._id+'].elementCheckboxEvent(\'' + 
				this.id + '\', ' + checkboxObj + '.value);');
			}
			
			eval(checkboxObj + ' = t;');
			this._checkboxObject = t;
			evalStr += checkboxObj + ".draw('" + checkboxSpan + "');";
			out[outI++] = '</span>';}
			out[outI++] = '&nbsp;';
			out[outI++] = '<span id="' + this._tree._objectId + '_e_' + this.id + '_caption"';
					
			if (this.onClick || this.hasEventAttached('onClickCaption')) {
				out[outI++] = ' style="cursor:pointer; cursor:hand;"';
			} else {
				out[outI++] = ' style="cursor:default;"';
			}		
			out[outI++] = ' onClick="Objects['+this._tree._id+'].executeOnElement(\'' + this.id + '\', \'fireEvent\', Array(\'onClickCaption\'));">';
		
		
		if (hRef) 
			out[outI++] = hRef;
		// adding node caption!!!
		out[outI++] = '<span id="' + this._tree._objectId + '_e_' +  this.id + '_caption2">' + 	this.caption + '</span>';
		if (hRef) 
			out[outI++] = '</a>';
		out[outI++] = '</span>';			
		if (this.onClick)
			out[outI++] = '</span>';		
		out[outI++] = '</div>';          //end of an individual node display

		if (this.afterCaptionSpan) {
			out[outI++] = '<div style="overflow:visible;">' + this.afterCaptionSpan + '</div>';
		} else {
		}			
		out[outI++] = '</div>';
		out[outI++] = '</nobr>';}
		out[outI++] = '<span id="' + this._tree._objectId + '_e_' + this.id + '_children"';
		if (!this.isOpen) {
			out[outI++] = ' style="display:none;"';
		}
		out[outI++] = '>';
			
		
		// loop the children
		if (this.isOpen || (lookAhead > 0) || (lookAhead == -1)) {
			for (var i = 0; i < this._children.length; i++) {
				if (lookAhead == -1) {
					var newLookAhead = -1;
				} else {
					if (this.isOpen)
						var newLookAhead = lookAhead;
					else
						var newLookAhead = lookAhead - 1;
				}
				var t = this._children[i].render(false, false, newLookAhead);
				out[outI++] = t[0];
				evalStr += t[1];
			}
		}
		
		out[outI++] = '</span>';   // end of a first level node and its children
		if (!omitDivTags) {
			out[outI++] = '</span>';
		}
		out[outI++] = "\n";
				
		this._isOutrendered = true;
		var content = new Array(out.join(''), evalStr);
		if (putIntoPage) {
			var doc = document.getElementById(this._tree._objectId + '_e_'+this.id);
			if (doc != null) {
				doc.innerHTML = content[0];
				if (content[1] != '') {
					eval(content[1]);
				}
				return true;
			} else {
				return false;
			}
		} else {
			return content;
		}
	} //end of render function
	
	// reset function
	this.reset = function() {
		this.caption = null;
		this.url = null;
		this.target = null;
		this.onClick = null;
		this.isOpen = false;
		this.isChecked = 0;
		this.checkboxName = null;
		this.beforeIconSpan = null;
		this.beforeCaptionSpan = null;
		this.afterCaptionSpan = null;
	}
	
	// initByArray function		
	this.initByArray = function(a, tree, level) {
		this._tree = tree;
		this._level = level;
		if (typeof(this._tree.stopWatch) == 'object')
			this._tree.stopWatch.takeTime('TreeElement.initByArray() ');
		if (this._tree.useAutoSequence && (level > 0)) {
			this.id = ++this._tree._elementSequence;
		} else {
			if (typeof(a['id']) == 'undefined') {
				this._addError('tree error : useAutoSequence is set to false, but for an array element there is no id defined.');
				return false;
			}
			this.id = a['id']; 
		}
		if (typeof(a['caption']) != 'undefined')
			this.caption = a['caption'];
		if (typeof(a['url']) != 'undefined')
			this.url = a['url'];
		if (typeof(a['target']) != 'undefined')
			this.target = a['target'];
		if (typeof(a['onClick']) != 'undefined')
			this.onClick = a['onClick'];
		if (typeof(a['isOpen']) != 'undefined')
			this.isOpen = a['isOpen'];
		if (typeof(a['isChecked']) != 'undefined')
			this.isChecked = parseInt(a['isChecked']);
		if (typeof(a['visible']) != 'undefined')
			this.visible = a['visible'];
		if (typeof(a['icon']) != 'undefined')
			this.icon = a['icon'];
		if (typeof(a['imageDir']) != 'undefined')
			this.imageDir = a['imageDir'];
		if (typeof(a['beforeIconSpan']) != 'undefined')
			this.beforeIconSpan = a['beforeIconSpan'];
		if (typeof(a['beforeCaptionSpan']) != 'undefined')
			this.beforeCaptionSpan = a['beforeCaptionSpan'];
		if (typeof(a['afterCaptionSpan']) != 'undefined')
			this.afterCaptionSpan = a['afterCaptionSpan'];
		if (typeof(a['radioButtonSelected']) != 'undefined')
			this.radioButtonSelected = a['radioButtonSelected'];
		if (typeof(a['dataContainer']) != 'undefined')
			this.dataContainer = a['dataContainer'];

		if (typeof(a['checkboxName']) != 'undefined') {
			this.checkboxName = a['checkboxName'];
		} else {
			if (this._tree.useCheckboxSystem) {
				this.checkboxName = 'bsTreeChk_'+this._tree._objectId + '_' + this.id;
			}
		}
		if (typeof(a['onClickCaption']) != 'undefined') {
			this.attachEvent('onClickCaption', a['onClickCaption']);
		}
		if (typeof(a['onChangeCheckbox']) != 'undefined') {
			this.attachEvent('onChangeCheckbox', a['onChangeCheckbox']);
		}
		if (typeof(a['events']) != 'undefined') {
			for (ev in a['events']) {
				this.attachEvent(ev, a['events'][ev]);
			}
		}
		return true;
	}
				
	// exportAsArray function
	this.exportAsArray = function(withChildren) {
		var ret = new Array();
		if (typeof(this.id) != 'undefined')
			ret['id'] = this.id;
		if (typeof(this.caption) != 'undefined')
			ret['caption'] = this.caption;
	
		if (typeof(this.url) != 'undefined')
			ret['url'] = this.url;
		if (typeof(this.target) != 'undefined')
			ret['target'] = this.target;
		if (typeof(this.onClick) != 'undefined')
			ret['onClick'] = this.onClick;
		if (typeof(this.isOpen) != 'undefined')
			ret['isOpen'] = this.isOpen;
		if (typeof(this.isChecked) != 'undefined')
			ret['isChecked'] = this.isChecked;
		if (typeof(this.visible) != 'undefined')
			ret['visible'] = this.visible;
		if (typeof(this.icon) != 'undefined')
			ret['icon'] = this.icon;
		if (typeof(this.imageDir) != 'undefined')
			ret['imageDir'] = this.imageDir;
		if (typeof(this.beforeIconSpan) != 'undefined')
			ret['beforeIconSpan'] = this.beforeIconSpan;
		if (typeof(this.afterCaptionSpan) != 'undefined')
			ret['afterCaptionSpan'] = this.afterCaptionSpan;
		if (typeof(this.radioButtonSelected) != 'undefined')
			ret['radioButtonSelected'] = this.radioButtonSelected;
		if (typeof(this.dataContainer) != 'undefined')
			ret['dataContainer'] = this.dataContainer;
		if (typeof(this.checkboxName) != 'undefined')
			ret['checkboxName'] = this.checkboxName;
		if (typeof(this.beforeCaptionSpan) != 'undefined')
			ret['beforeCaptionSpan'] = this.beforeCaptionSpan;

		if (withChildren) {
			ret['children'] = new Array();
			for (var i=0; i<this._children.length; i++) {
				ret['children'][ret['children'].length] = this._children[i].exportAsArray(true);
			}
		}
		return ret;
	}
			
	//	updateObjectByArray function
	this.updateObjectByArray = function(a) {
		this.reset();
		if (a['caption'])
			this.caption = a['caption'];
		if (a['url'])
			this.url = a['url'];
		if (a['target'])
			this.target = a['target'];
		if (a['onClick'])
			this.onClick = a['onClick'];
		if (a['isOpen'])
			this.isOpen = a['isOpen'];
		if (a['isChecked'])
			this.isChecked = a['isChecked'];
		if (a['imageDir'])
			this.imageDir = a['imageDir'];
		if (a['checkboxName']) {
			this.checkboxName = a['checkboxName'];
		} else {
			if (this._tree.useCheckboxSystem) {
				this.checkboxName = 'bsTreeCheckbox'+this.id;
			}
		}
		if (a['beforeIconSpan'])
			this.beforeIconSpan = a['beforeIconSpan'];
		if (a['beforeCaptionSpan'])
			this.beforeCaptionSpan = a['beforeCaptionSpan'];
		if (a['afterCaptionSpan'])
			this.afterCaptionSpan = a['afterCaptionSpan'];
	}
	
	// getJavascriptCode function
	this.getJavascriptCode = function(varName, recursive) {
		var ret = "";
		if ((this._tree.useAutoSequence && (this.id > 1))
			|| (!this._tree.useAutoSequence && !this.parent)) {
		} else {
			ret += varName + " = new Array();\n";
			if (!this._tree.useAutoSequence) {
				ret += varName + "['id'] = \"" + this.id + "\";\n";
			}
			if (this.caption)
				ret += varName
					+ "['caption'] = \""
					+ this.caption
					+ "\";\n";
			if (this.url)
				ret += varName + "['url'] = \"" + this.url + "\";\n";
			if (this.target)
				ret += varName
					+ "['target'] = \""
					+ this.target
					+ "\";\n";
			if (this.onClick) {
				//var onClick = this.onClick.replace(/'/g,  "\'");
				var onClick =
					this.onClick.replace(/ "/g,  '\"');
				ret += varName + "['onClick'] =\"" + onClick + "\";\n";
			}
			if (this.imageDir)
				ret += varName + "['imageDir']= \"" + this.imageDir + "\";\n";
			if (this.isOpen)
				ret += varName + "['isOpen'] = '" + this.isOpen + "';\n";
			if (this.isChecked)
				ret += varName + "['isChecked'] = '" + this.isChecked + "';\n";
			if (this.checkboxName)
				ret += varName + "['checkboxName']  = '" + this.checkboxName + "';\n";
			if (this.icon)
				ret += varName + "['icon'] = \"" + this.icon + "\";\n";
			if (this.beforeIconSpan)
				ret += varName
					+ "['beforeIconSpan']= \""
					+ this.beforeIconSpan
					+ "\";\n";
			if (this.beforeCaptionSpan)
				ret += varName
					+ "['beforeCaptionSpan'] = \""
					+ this.beforeCaptionSpan
					+ "\";\n";
			if (this.afterCaptionSpan)
				ret += varName
					+ "['afterCaptionSpan'] = \""
					+ this.afterCaptionSpan
					+ "\";\n";
			varName += "['children']";
		}
		if (recursive) {
			if (this._children.length > 0) {
				ret += varName + " = new Array();\n";
				for (var i = 0; i < this._children.length; i++) {
					ret	+= this._children[i].getJavascriptCode(
							varName + "[" + i + "]",
							recursive);
				}
			}
		}
		return ret;
	}

	// setActive function
	this.setActive = function() {
		var activeElement = this._tree.getActiveElement();
		if (activeElement != false) {
			activeElement.unsetActive();
		}
		this._tree.setActiveElement(this);
		this._highlight();
	}
	
	//_highlight function
	this._highlight = function() {
		var elmSetActive = document.getElementById(this._tree._objectId + '_e_'+this.id + '_caption');
		if (elmSetActive != null) {
			elmSetActive.style.backgroundColor = this._getVar('captionBgColor');
		} else {
			setTimeout(	"Objects["
					+ this._tree._id
					+ "].executeOnElement('"
					+ this.id
					+ "', '_highlight');",800);
		}
	}
	
	// unsetActive function
	this.unsetActive = function() {
		var e =	document.getElementById(
				this._tree._objectId + '_e_'+this.id + '_caption');
		if (e != null)
			e.style.backgroundColor = 'transparent';
	}
	
	// toggleOpenClose function
	this.toggleOpenClose = function() {
		if (this.isOpen) {
			if (this.hasEventAttached('onBeforeClose')) {
				var status = this.fireEvent('onBeforeClose');
				if (status != true)
					return;
			}
			this.close();
			if (this.hasEventAttached('onAfterClose'))
				this.fireEvent('onAfterClose');
		} else {
			if (this.hasEventAttached('onBeforeOpen')) {
				var status = this.fireEvent('onBeforeOpen');
				if (status != true)
					return;
			}
			this.open();
			if (this.hasEventAttached('onAfterOpen'))
				this.fireEvent('onAfterOpen');
		}
	}
	
	// open function			
	this.open = function(checkParents) {
		if (this.isOpen)
			return;
			
		this.isOpen = true;
		if (true || !doRender) {
			if (this._isOutrendered) {
				var d =	document.getElementById( this._tree._objectId + '_e_'+this.id + '_children');
				d.style.display = 'block';
				this._switchIconsOnToggleOpenClose();
			} else {
				if (checkParents) {
					this._renderParentsUp();
				}
				this.render(true, true);
			}
		}
		if (this._tree.autoCollapse) {
			var sib = this.getSiblings();
			for (var i = 0; i < sib.length; i++) {
				if (sib[i].id != this.id) {
					sib[i].close();
				}
			}
		}
		
		if (this.hasVisibleChildren()) {
			var lookAhead = this._tree.lookAhead;
			var treeElm = this;
			for (var j = 0; j < treeElm._children.length; j++) {
				if (typeof(treeElm._children[j]._undoneChildren) == 'object') {
					for (var k = 0;k < treeElm._children[j]._undoneChildren.length;k++) {
						var newE = this._tree._createTreeElement(
								treeElm._children[j]._undoneChildren[k],
								treeElm._children[j]._level + 1);
						treeElm._children[j].addChild(newE);
					}
					treeElm._children[j]._undoneChildren = false;
				}
				if (treeElm._children[j].hasVisibleChildren()) {
					var doRender = false;
					for (var k = 0; k < treeElm._children[j]._children.length; k++) {
						if (!treeElm._children[j]._children[k]._isOutrendered) {
							var doRender = true;
							break;
						}
					}
					if (doRender) {
						treeElm._children[j].render(true, true, lookAhead);
					}
				}
			}
		}
	}
	
	// _renderParentsUp function
	this._renderParentsUp = function() {
		if (typeof(this.parent) == 'undefined')
			this.parent._renderParentsUp();
		if (this._isOutrendered)
			return;
		this.render(true, true);
	}
	
	// close function
	this.close = function() {
		if (!this.isOpen)
			return;
		this.isOpen = false;
		if (this._isOutrendered) {
			var d =
				document.getElementById(
					this._tree._objectId + '_e_'+this.id + '_children');
			d.style.display = 'none';
			this._switchIconsOnToggleOpenClose();
		} else {
			this.render(true, true);
		}
	}
	
	// _switchIconsOnToggleOpenClose function
	this._switchIconsOnToggleOpenClose = function() {
		var openClose =
			document.getElementById(
				this._tree._objectId + '_e_'+this.id + '_openClose');
		openClose.src = this._getSourceOpenCloseIcon();
		if (this._getVar('useFolderIcon')) {
			var folderIconId = this._tree._objectId + '_e_'+this.id + '_folder';
			var fIcon = document.getElementById(folderIconId);
			if (fIcon) {
				fIcon.src = this._getSourceFolderIcon();
			}
		}
	}
	
	// _getSourceOpenCloseIcon function
	this._getSourceOpenCloseIcon = function() {
		if (this.hasSiblingsDown()) {
			var imgNumber = 3;
		} else {
			var imgNumber = 2;
		}
		if (this.hasVisibleChildren()) {
			if ((this._level == 0)
				|| (!this._tree.showPseudoElement
					&& (this._level == 1)
					&& ((this._tree.useAutoSequence && (this.id == 1))
						|| (!this._tree.useAutoSequence && true)))) {
				if (this.hasSiblingsDown()) {
					imgNumber++;
				} else {
					imgNumber--;
				}
			}
			if (this.isOpen) {
				var plusImg = 'minus'+imgNumber;
				var onClick = 'Close';
			} else {
				var plusImg = 'plus'+imgNumber;
				var onClick = 'Open';
			}
		} else {
			var plusImg = 'line'+imgNumber;
		}
		var imageDir = this._getVar('imageDir');
		return imageDir + plusImg + '.gif';
	}
	
	// _getSourceFolderIcon function
	this._getSourceFolderIcon = function() {
		var imageDir = this._getVar('imageDir');
		switch (typeof(this.icon)) {
			case 'undefined':
				if (this._tree.useLeaf && !this.hasChildren()) {
					var folderImg = 'leaf';
				} else {
					var folderImg = 'folder';
					folderImg += (this.isOpen) ? 'Open': 'Closed';
				}
				return imageDir + folderImg + '.gif';
				break;
			case 'bool':
			case 'boolean':
				break;
			case 'string':
				if (this.icon != 'false') {
					var ret = '';
					if (!this._iconHasPath(this.icon))
						ret += imageDir;
					ret += this.icon;
					if (!this._iconHasExtension(this.icon))
						ret += '.gif';
					return ret;
				}
		}
		return '';
	}
	
	// hasChildren function
	this.hasChildren = function() {
		return (this._children.length > 0);
	}
	
	// hasVisibleChildren function
	this.hasVisibleChildren = function() {
		if (!this._children || !(this._children.length > 0))
			return false;
		for (var i = 0; i < this._children.length; i++) {
			if (this._children[i].visible)
				return true;
		}
		return false;
	}
	
	// numChildren function
	this.numChildren = function() {
		return this._children.length;
	}
	
	// childPos function
	this.childPos = function(id) {
		for (var i = 0; i < this._children.length; i++) {
			if (this._children[i].id == id)
				return ++i;
		}
		return false;
	}
	
	this.hasSiblings = function() {
	}
	
	// hasSiblingsDown function
	this.hasSiblingsDown = function() {
		try {
			var tot = this.parent.numChildren();
			var pos = this.parent.childPos(this.id);
			return (pos < tot);
		} catch (e) {
			return false;
		}
	}
	
	this.hasSiblingsAbove = function() {
	}
	
	// getSiblings function
	this.getSiblings = function() {
		try {
			return this.parent.getChildren();
		} catch (e) {
			return new Array;
		}
	}
	
	// getChildren function
	this.getChildren = function() {
		return this._children;
	}
	
	// getParentId function
	this.getParentId = function() {
		try {
			return this.parent.id;
		} catch (e) {
			return false;
		}
	}
	
	// hasParent function
	this.hasParent = function() {
		return (this.parent);
	}
	
	// attachEvent function
	this.attachEvent = function(trigger, yourEvent) {
		if (typeof(this._attachedEvents) == 'undefined') {
			this._attachedEvents = new Array();
		}
		if (typeof(this._attachedEvents[trigger]) == 'undefined') {
			this._attachedEvents[trigger] = new Array(yourEvent);
		} else {
			this._attachedEvents[trigger][this._attachedEvents[trigger].length] = yourEvent;
		}
	}
	
	// hasEventAttached function
	this.hasEventAttached = function(trigger) {
		return ((typeof(this._attachedEvents) != 'undefined')
			&& (typeof(this._attachedEvents[trigger]) != 'undefined'));
	}
	
	// fireEvent function
	this.fireEvent = function(trigger) {
		var ret = true;
		if (trigger == 'onClickCaption') {
			this.setActive();
		}
		if ((typeof(this._attachedEvents) != 'undefined') && (typeof(this._attachedEvents[trigger]) != 'undefined')) {
			var e = this._attachedEvents[trigger];
			if ((typeof(e) == 'string') || (typeof(e) == 'function')) {
				e = new Array(e);
			}
			for (var i=0; i<e.length; i++) {
				if (typeof(e[i]) == 'function') {
				var status = e[i](this);
				if (status == false) 
					ret = false;
				} else if (typeof(e[i]) == 'string') {
  					var ev = e[i].replace(/__this\.id__/g, this.id); 
					//replace the string __this.id__ with the actual id.
  					//ev = ev.replace(/__this__/g, 'this'); //replace the string __this__ with 'this'.
					eval(ev);
				}
			}
		}
		return ret;
	}
	
	// _addError function
	this._addError = function(str) {
		if (typeof(this._errorArray) == 'undefined') {
			this._errorArray = new Array(str);
		} else {
			this._errorArray[this._errorArray.length] = str;
		}
	}
	
	// getLastError function
	this.getLastError = function() {
		if (typeof(this._errorArray) != 'undefined') {
			if (this._errorArray.length > 0) {
				return this._errorArray[this._errorArray.length - 1];
			}
		}
		return false;
	}
	
	// _getVar function
	this._getVar = function(varName) {
		if (typeof(this[varName]) != 'undefined') {
			return this[varName];
		} else {
			if (this._tree.walkTree && (typeof(this.parent) != 'undefined')) {
				return this.parent._getVar(varName);
			} else if (typeof(this._tree[varName]) != 'undefined') {
				return this._tree[varName];
			} else {
				return null;
			}
		}
	}
	
	// onMouseOver	function		
	this.onMouseOver = function() {
		var img = document.getElementById(this._spanId + 'icon');
		if (!img.swapOver0) {
			img.swapOver0 = new Image();
			img.swapOver0.src = this.imgDir + 'enabled_0_over.gif';
			img.swapOver1 = new Image();
			img.swapOver1.src = this.imgDir + 'enabled_1_over.gif';
			img.swapOver2 = new Image();
			img.swapOver2.src = this.imgDir + 'enabled_2_over.gif';
			img.swapOut0 = new Image();
			img.swapOut0.src = this.imgDir + 'enabled_0.gif';
			img.swapOut1 = new Image();
			img.swapOut1.src = this.imgDir + 'enabled_1.gif';
			img.swapOut2 = new Image();
			img.swapOut2.src = this.imgDir + 'enabled_2.gif';
		}
		img.src = img['swapOver'+this.value].src;
	}
	
	// onMouseOut function
	this.onMouseOut = function() {
		var img = document.getElementById(this._spanId + 'icon');
		img.src = img['swapOut'+this.value].src;
	}
	
	// setCheckboxValue function
	this.setCheckboxValue = function(value, fireEvents, doWalk) {
		if (typeof(fireEvents) == 'undefined')
			fireEvents = true;
		if (typeof(doWalk) == 'undefined')
			doWalk = true;
		if (!this.hasChildren()) {
			value = (value) ? 2 : 0;
		} else {
			if (this.isChecked == 0) {
				if (this._tree.checkboxSystemWalkTree
					&& (this._tree.checkboxSystemWalkTree != 2)
					&& (this._tree.checkboxSystemWalkTree != 3)
					&& this.hasChildren()) {
					value = 1;
				}
			}
		}

		this.isChecked = value;
		this._checkboxObject.setTo(value, true);
		if (fireEvents) {
			if (this.hasEventAttached('onChangeCheckbox'))
				this.fireEvent('onChangeCheckbox');
		}
		if (doWalk) {
			if ((this._tree.checkboxSystemWalkTree == 3)
				|| (this._tree.checkboxSystemWalkTree == 1)
				|| (this._tree.checkboxSystemWalkTree == 4)) {
				this.parent.updateCheckboxFromChild();
			}
			if ((this._tree.checkboxSystemWalkTree == 3)
				|| (this._tree.checkboxSystemWalkTree == 2)
				|| ((this._tree.checkboxSystemWalkTree == 4) && (value == 0))) {
				this.checkboxUpdateDown(value);
			}
		} // end if doWalk
	}
	
	
	// 	checkboxEvent function
	this.checkboxEvent = function(value) {
		if (!this.hasChildren()) {
			value = (value) ? 2 : 0;
		} else {
			if (this.isChecked == 1) {
				if ((!this._tree.checkboxSystemIfPartlyThenFull)
					|| ((this._tree.checkboxSystemWalkTree)
						&& (this._tree.checkboxSystemWalkTree != 2)
						&& (this._tree.checkboxSystemWalkTree != 3))) {
					value = 0;
				} else {
					value = 2;
				}
			} else if (this.isChecked == 0) {
				if (this._tree.checkboxSystemWalkTree
					&& (this._tree.checkboxSystemWalkTree != 2)
					&& (this._tree.checkboxSystemWalkTree != 3)
					&& this.hasChildren()) {
					value = 1;
				}
			}
		}
		this.isChecked = value;
		this._checkboxObject.setTo(value, true);
		if (this.hasEventAttached('onChangeCheckbox'))
			this.fireEvent('onChangeCheckbox');
		if ((this._tree.checkboxSystemWalkTree == 3)
			|| (this._tree.checkboxSystemWalkTree == 1)
			|| (this._tree.checkboxSystemWalkTree == 4)) {
			this.parent.updateCheckboxFromChild();
		}
		if ((this._tree.checkboxSystemWalkTree == 3)
			|| (this._tree.checkboxSystemWalkTree == 2)
			|| ((this._tree.checkboxSystemWalkTree == 4) && (value == 0))) {
				this.checkboxUpdateDown(value);
		}
	}
	
	// checkboxUpdateDown function
	this.checkboxUpdateDown = function(value) {
		for (var i = 0; i < this._children.length; i++) {
			this._children[i]._updateCheckboxFromParent(value, true);
		}
	}
	
	// updateCheckboxVisually function
	this.updateCheckboxVisually = function() {
		if (typeof(this._checkboxObject) == 'object') {
			try {
				this._checkboxObject.setTo(this.isChecked);
			} catch (e) {
			}
		}
	}
	
	//_updateCheckboxFromParent function
	this._updateCheckboxFromParent = function(newValue, recursiveDown) {
		var backupValue = this.isChecked;
		this.isChecked = (newValue) ? 2 : 0;
		var hasChanged = (this.isChecked != backupValue);
		if (hasChanged) {
			this.updateCheckboxVisually();
			if (this.hasEventAttached('onChangeCheckbox'))
				this.fireEvent('onChangeCheckbox');
		}
		if (recursiveDown)
			this.checkboxUpdateDown(newValue, true);
	}
	
	// updateCheckboxFromChild function
	this.updateCheckboxFromChild = function() {
		var backupIsChecked = this.isChecked;
		var numYes = 0;
		var numNo = 0;
		var isPartly = false;
		for (var i = 0; i < this._children.length; i++) {
			if (this._children[i].isChecked == 1) {
				isPartly = true;
				this.isChecked = 1;
				break;
			} else if (this._children[i].isChecked) {
				numYes++;
			} else {
				numNo++;
			}
			if ((numYes > 0) && (numNo > 0)) {
				break;
			}
		}
		if (!isPartly) {
			if ((numYes > 0) && (numNo > 0)) {
				this.isChecked = 1;
			} else if (numYes > 0) {
				this.isChecked = 2;
			} else {
				this.isChecked = 0;
			}
		}
		if (backupIsChecked != this.isChecked) {
			this.updateCheckboxVisually();
			if (this.hasEventAttached('onChangeCheckbox'))
				this.fireEvent('onChangeCheckbox');
		}
		if (typeof(this.parent) == 'object') {
			this.parent.updateCheckboxFromChild();
		}
	}
	
	// _updateLevelAndParent function
	this._updateLevelAndParent = function(treeElement) {
		if ((typeof(treeElement._children) == 'object')
			&& (treeElement._children.length > 0)) {
			for (var i = 0; i < treeElement._children.length; i++) {
				treeElement._children[i].parent = treeElement;
				treeElement._children[i]._level = treeElement._level + 1;
				this._updateLevelAndParent(treeElement._children[i]);
			}
		}
	}
	
	// _getLinkStyle function
	this._getLinkStyle = function() {
		if (typeof(this.linkStyle) != 'undefined')
			return this.linkStyle;
		if (typeof(this._tree.linkStyle) != 'undefined')
			return this._tree.linkStyle;
		return '';
	}
	
	// _iconHasExtension function
	this._iconHasExtension = function(iconStr) {
		var iconLower = iconStr.toLowerCase();
		var iconPos = iconLower.lastIndexOf('.');
		if (iconPos > -1) {
			var iconExt = iconLower.substr(iconPos + 1);
			if ((iconExt != 'gif')
				&& (iconExt != 'png')
				&& (iconExt != 'jpg')
				&& (iconExt != 'jpeg')) {
				return false;
			}
		} else {
			return false;
		}
		return true;
	}
	
	// _iconHasPath function
	this._iconHasPath = function(iconStr) {
		if (iconStr.indexOf('://') > -1)
			return true;
		if (iconStr.substr(0, 1) == '/')
			return true;
		return false;
	}
}

//eof