function $(id) {return document.getElementById(id);}

function setcookie(cookieName, cookieValue, seconds, path, domain, secure) {
	var expires = new Date();
	expires.setTime(expires.getTime() + seconds);
	document.cookie = escape(cookieName) + '=' + escape(cookieValue)
		+ (expires ? '; expires=' + expires.toGMTString() : '')
		+ (path ? '; path=' + path : '/')
		+ (domain ? '; domain=' + domain : '')
		+ (secure ? '; secure' : '');
}

function getcookie(name) {
	var cookie_start = document.cookie.indexOf(name);
	var cookie_end = document.cookie.indexOf(";", cookie_start);
	return cookie_start == -1 ? '' : unescape(document.cookie.substring(cookie_start + name.length + 1, (cookie_end > cookie_start ? cookie_end : document.cookie.length)));
}
function arraypush(a, value) {a[a.length] = value;	return a.length;}
function updatestring(str1, str2, clear) {str2 = '_' + str2 + '_';if(clear) {return str1.replace(str2, '');	} else if(str1.indexOf(str2) == -1) {str1 += str2;}	return str1;}

var icon = new Object();
icon.root		= 'frame_images/tree_root.gif';
icon.folder		= 'frame_images/tree_folder.gif';
icon.folderOpen		= 'frame_images/tree_folderopen.gif';
icon.file		= 'frame_images/tree_file.gif';
icon.empty		= 'frame_images/tree_empty.gif';
icon.line		= 'frame_images/tree_line.gif';
icon.lineMiddle		= 'frame_images/tree_linemiddle.gif';
icon.lineBottom		= 'frame_images/tree_linebottom.gif';
icon.plus		= 'frame_images/tree_plus.gif';
icon.plusMiddle		= 'frame_images/tree_plusmiddle.gif';
icon.plusBottom		= 'frame_images/tree_plusbottom.gif';
icon.minus		= 'frame_images/tree_minus.gif';
icon.minusMiddle	= 'frame_images/tree_minusmiddle.gif';
icon.minusBottom	= 'frame_images/tree_minusbottom.gif';

function treeNode(id, pid, name, url, target, open) {
	//public
	var obj = new Object();	obj.id = id;obj.pid = pid;obj.name = name;obj.url = url;obj.target = target;obj.open = open;
	//private
	obj._isOpen = open;	obj._lastChildId = 0;obj._pid = 0;
	return obj;
}

function dzTree(treeName) {
	this.nodes = new Array();
	this.openIds = getcookie('forum_leftmenu_openids');
	this.pushNodes = new Array();
	this.addNode = function(id, pid, name, url, target, open) {
		var theNode = new treeNode(id, pid, name, url, target, open);
		arraypush(this.pushNodes, id);
		if(!this.nodes[pid]) {this.nodes[pid] = new Array();}
		this.nodes[pid]._lastChildId = id;

		for(k in this.nodes) {
			if(this.openIds && this.openIds.indexOf('_' + theNode.id) != -1) {
				theNode._isOpen = true;
			}
			if(this.nodes[k].pid == id) {theNode._lastChildId = this.nodes[k].id;}
		}
		this.nodes[id] = theNode;
	}

	this.show = function() {
		var s = '<div class="tree">';
		s += this.createTree(this.nodes[0]);
		s += '</div>';
		document.write(s);
	}

	this.createTree = function(node, padding) {
		padding = padding ? padding : '';
		if(node.id == 0){var icon1 = '';}
		else {
			var icon1 = '<img src="' + this.getIcon1(node) + '" onclick="' + treeName + '.switchDisplay(\'' + node.id + '\')" id="icon1_' + node.id + '" style="cursor: pointer;">';
		}
		var icon2 = '<img src="' + this.getIcon2(node) + '" onclick="' + treeName + '.switchDisplay(\'' + node.id + '\')" id="icon2_' + node.id + '" style="cursor: pointer;">';
		var s = '<div class="node" id="node_' + node.id + '">' + padding + icon1 + icon2 + this.getName(node) + '</div>';
		s += '<div class="nodes" id="nodes_' + node.id + '" style="display:' + (node._isOpen ? '' : 'none') + '">';
		for(k in this.pushNodes) {
			var id = this.pushNodes[k];
			var theNode = this.nodes[id];
			if(theNode.pid == node.id) {
				if(node.id == 0){var thePadding = '';}
				else {
					var thePadding = padding + (node.id == this.nodes[node.pid]._lastChildId  ? '<img src="' + icon.empty + '">' : '<img src="' + icon.line + '">');
				}
				if(!theNode._lastChildId) {
					var icon1 = '<img src="' + this.getIcon1(theNode) + '"' + ' id="icon1_' + theNode.id + '">';
					var icon2 = '<img src="' + this.getIcon2(theNode) + '" id="icon2_' + theNode.id + '">';
					s += '<div class="node" id="node_' + theNode.id + '">' + thePadding + icon1 + icon2 + this.getName(theNode) + '</div>';
				} else {s += this.createTree(theNode, thePadding);}
			}
		}
		s += '</div>';
		return s;
	}

	this.getIcon1 = function(theNode) {
		var parentNode = this.nodes[theNode.pid];
		var src = '';
		if(theNode._lastChildId) {
			if(theNode._isOpen) {
				if(theNode.id == 0) {return icon.minus;	}
				if(theNode.id == parentNode._lastChildId) {	src = icon.minusBottom;	}
				else {src = icon.minusMiddle;}
			} else {
				if(theNode.id == 0) {return icon.plus;}
				if(theNode.id == parentNode._lastChildId) {	src = icon.plusBottom;}
				else {src = icon.plusMiddle;}
			}
		} else {
			if(theNode.id == parentNode._lastChildId) {	src = icon.lineBottom;}
			else {src = icon.lineMiddle;}
		}
		return src;
	}

	this.getIcon2 = function(theNode) {
		var src = '';
		if(theNode.id == 0 ) {return icon.root;}
		if(theNode._lastChildId) {
			if(theNode._isOpen) {src = icon.folderOpen;}
			else {src = icon.folder;}
		} else {src = icon.file;}
		return src;
	}

	this.getName = function(theNode) {
		if(theNode.url) {return '<a href="'+theNode.url+'" target="' + theNode.target + '"> '+theNode.name+'</a>';}
		else {return theNode.name;}
	}
	this.switchDisplay = function(nodeId) {
		eval('var theTree = ' + treeName);
		var theNode = theTree.nodes[nodeId];
		if($('nodes_' + nodeId).style.display == 'none') {
			theTree.openIds = updatestring(theTree.openIds, nodeId);
			setcookie('forum_leftmenu_openids', theTree.openIds, 8640000000);
			theNode._isOpen = true;
			$('nodes_' + nodeId).style.display = '';
			$('icon1_' + nodeId).src = theTree.getIcon1(theNode);
			$('icon2_' + nodeId).src = theTree.getIcon2(theNode);
		} else {
			theTree.openIds = updatestring(theTree.openIds, nodeId, true);
			setcookie('forum_leftmenu_openids', theTree.openIds, 8640000000);
			theNode._isOpen = false;
			$('nodes_' + nodeId).style.display = 'none';
			$('icon1_' + nodeId).src =  theTree.getIcon1(theNode);
			$('icon2_' + nodeId).src = theTree.getIcon2(theNode);

		}
	}
}