function Node(id, pid, name, url, title, target, checked, icon, iconOpen, open ) {
	this.id = id;
	this.pid = pid;
	this.name = name;
	this.url = url;
	this.title = title;
	this.target = target;
	this.icon = icon;
	this.iconOpen = iconOpen;
	this._io = open || false;
	this._is = false;
	this._ls = false;
	this._hc = false;
	this._ai = 0;
	this._p;
	this._checked = checked || false;
};

// Tree object
function dTree(objName,filepath,showBoxLevel,showBoxOnlyLeaf) {
	this.config = {
		target					: null,
		folderLinks			: true,
		useSelection		: true,
		useLines				: true,
		useIcons				: true,
		useStatusText		: false,
		closeSameLevel	: false,
		inOrder					: false,
		check           : true
	}
	this.filePath=filepath;
	this.showBoxLevel = showBoxLevel;
	this.showBoxOnlyLeaf = showBoxOnlyLeaf;
	this.icon = {
		root				: this.filePath+'base.gif',
		folder			: this.filePath+'collection.gif',
		folderOpen	: this.filePath+'collection.gif',
		node				: this.filePath+'collection.gif',
		empty				: this.filePath+'empty.gif',
		line				: this.filePath+'L4.gif',
		join				: this.filePath+'L1.gif',
		joinBottom	: this.filePath+'L2.gif',
		plus				: this.filePath+'P1.gif',
		plusBottom	: this.filePath+'P2.gif',
		minus				: this.filePath+'M1.gif',
		minusBottom	: this.filePath+'M2.gif',
		nlPlus			: this.filePath+'nolines_plus.gif',
		nlMinus			: this.filePath+'nolines_minus.gif'
	};
	this.obj = objName;
	this.aNodes = [];
	this.aIndent = [];
	this.root = new Node(-1);
	this.selectedNode = null;
	this.selectedFound = false;
	this.completed = false;
};

// Adds a new node to the node array
dTree.prototype.add = function(id, pid, name, url, title, target, icon, iconOpen, open) {
	this.aNodes[this.aNodes.length] = new Node(id, pid, name, url, title, target, icon, iconOpen, open);
};

// Open/close all nodes
dTree.prototype.openAll = function() {
	this.oAll(true);
};
dTree.prototype.closeAll = function() {
	this.oAll(false);
};

// Outputs the tree to the page
dTree.prototype.toString = function() {
	var str = '<div class="dtree">\n';
	if (document.getElementById) 
	{
		str += this.addNode(this.root);
	}
	else 
		str += 'Browser not supported.';
	str += '</div>';
	if (!this.selectedFound) this.selectedNode = null;
	this.completed = true;
	return str;
};

// Creates the tree structure
dTree.prototype.addNode = function(pNode) {
	var str = '';
	var n=0;
	if (this.config.inOrder) n = pNode._ai;
  for (n; n<this.aNodes.length; n++) {
		if (this.aNodes[n].pid == pNode.id) {
			var cn = this.aNodes[n];
			cn._p = pNode;
			cn._ai = n;
			this.setCS(cn);
			if (!cn.target && this.config.target) cn.target = this.config.target;
			if (!this.config.folderLinks && cn._hc) cn.url = null;
			if (this.config.useSelection && cn.id == this.selectedNode && !this.selectedFound) {
					cn._is = true;
					this.selectedNode = n;
					this.selectedFound = true;
			}
			str += this.node(cn, n);
			if (cn._ls) break;
		}
	}
	return str;
};

// Creates the node icon, url and text
dTree.prototype.node = function(node, nodeId) {
	var str = '<div class="dTreeNode">' + this.indent(node, nodeId);
	if (this.config.check)
	{
		if((this.showBoxLevel!='no')&&(this.getNodeLevel(nodeId)>this.showBoxLevel||!node._hc)){//��ϲ㼶Ҫ�����ʾcheckbox
			if(node._checked)
			{
				str+= '<input type="checkbox" name="'+node.id+'" id="c'+ this.obj + nodeId + '" onclick="javascript:'+this.obj+'.cc('+nodeId+')" checked/>';
			}else
			{
				str+= '<input type="checkbox" name="'+node.id+'" id="c'+ this.obj + nodeId + '" onclick="javascript:'+this.obj+'.cc('+nodeId+')"/>';
			}
		}
		if((this.showBoxOnlyLeaf!='no')&&(this.showBoxOnlyLeaf=='leaf'&&!node._hc)){//leafֻ��Ҷ�ӽڵ���ʾcheckbox,all����ʾ
			if(node._checked)
			{
				str+= '<input type="checkbox" name="'+node.id+'" id="c'+ this.obj + nodeId + '" onclick="javascript:'+this.obj+'.cc('+nodeId+')" checked/>';
			}else
			{
				str+= '<input type="checkbox" name="'+node.id+'" id="c'+ this.obj + nodeId + '" onclick="javascript:'+this.obj+'.cc('+nodeId+')"/>';
			}
				//alert(str);
		}
		if((this.showBoxOnlyLeaf!='no')&&(this.showBoxOnlyLeaf=='all')){//leafֻ��Ҷ�ӽڵ���ʾcheckbox,all����ʾ
			if(node._checked)
			{
				str+= '<input type="checkbox" name="'+node.id+'" id="c'+ this.obj + nodeId + '" onclick="javascript:'+this.obj+'.cc('+nodeId+')" checked/>';
			}else
			{
				str+= '<input type="checkbox" name="'+node.id+'" id="c'+ this.obj + nodeId + '" onclick="javascript:'+this.obj+'.cc('+nodeId+')"/>';
			}
		}
		
	}
	if (this.config.useIcons) {
		if (!node.icon) node.icon = (this.root.id == node.pid) ? this.icon.root : ((node._hc) ? this.icon.folder : this.icon.node);
		if (!node.iconOpen) node.iconOpen = (node._hc) ? this.icon.folderOpen : this.icon.node;
		if (this.root.id == node.pid) {
			node.icon = this.icon.root;
			node.iconOpen = this.icon.root;
		}
		str += '<img id="i' + this.obj + nodeId + '" src="' + ((node._io) ? node.iconOpen : node.icon) + '" alt="" />';
	}
	if (node.url) {
		str += '<a id="s' + this.obj + nodeId + '" class="' + ((this.config.useSelection) ? ((node._checked ? 'nodeSel' : 'node')) : 'node') + '" href="' + node.url + '"';
		if (node.title) str += ' title="' + node.title + '"';
		if (node.target) str += ' target="' + node.target + '"';
		if (this.config.useStatusText) str += ' onmouseover="window.status=\'' + node.name + '\';return true;" onmouseout="window.status=\'\';return true;" ';
		if (this.config.useSelection && ((node._hc && this.config.folderLinks) || !node._hc))
			str += ' onclick="javascript: ' + this.obj + '.s(' + nodeId + ');"';
		str += '>';
	}
	else if ((!this.config.folderLinks || !node.url) && node._hc && node.pid != this.root.id)
		str += '<a href="javascript: ' + this.obj + '.o(' + nodeId + ');" class="node">';
	str += node.name;
	if (node.url || ((!this.config.folderLinks || !node.url) && node._hc)) str += '</a>';
	str += '</div>';
	if (node._hc) {
		str += '<div id="d' + this.obj + nodeId + '" class="clip" style="display:' + ((this.root.id == node.pid || node._io) ? 'block' : 'none') + ';">';
		str += this.addNode(node);
		str += '</div>';
	}
	this.aIndent.pop();
	return str;
};

// Adds the empty and line icons
dTree.prototype.indent = function(node, nodeId) {
	var str = '';
	if (this.root.id != node.pid) {
		for (var n=0; n<this.aIndent.length; n++)
			str += '<img src="' + ( (this.aIndent[n] == 1 && this.config.useLines) ? this.icon.line : this.icon.empty ) + '" alt="" />';
		(node._ls) ? this.aIndent.push(0) : this.aIndent.push(1);
		if (node._hc) {
			str += '<a href="javascript: ' + this.obj + '.o(' + nodeId + ');"><img id="j' + this.obj + nodeId + '" src="';
			if (!this.config.useLines) str += (node._io) ? this.icon.nlMinus : this.icon.nlPlus;
			else str += ( (node._io) ? ((node._ls && this.config.useLines) ? this.icon.minusBottom : this.icon.minus) : ((node._ls && this.config.useLines) ? this.icon.plusBottom : this.icon.plus ) );
			str += '" alt="" /></a>';
		} else str += '<img src="' + ( (this.config.useLines) ? ((node._ls) ? this.icon.joinBottom : this.icon.join ) : this.icon.empty) + '" alt="" />';
	}
	return str;
};

// Checks if a node has any children and if it is the last sibling
dTree.prototype.setCS = function(node) {
	var lastId;
	for (var n=0; n<this.aNodes.length; n++) {
		if (this.aNodes[n].pid == node.id) node._hc = true;
		if (this.aNodes[n].pid == node.pid) lastId = this.aNodes[n].id;
	}
	if (lastId==node.id) node._ls = true;
};

// Highlights the selected node
dTree.prototype.s = function(id) {
	$('a[class=nodeSel]').attr('class','');
	if (!this.config.useSelection) return;
	var cn = this.aNodes[id];
	if (cn._hc && !this.config.folderLinks) return;
	if (this.selectedNode != id) {
		if (this.selectedNode || this.selectedNode==0) {
			eOld = document.getElementById("s" + this.obj + this.selectedNode);
			eOld.className = "node";
		}
		eNew = document.getElementById("s" + this.obj + id);
		eNew.className = "nodeSel";
		this.selectedNode = id;
	}
};


// Toggle Open or close
dTree.prototype.o = function(id) {
	var cn = this.aNodes[id];
	this.nodeStatus(!cn._io, id, cn._ls);
	cn._io = !cn._io;
	if (this.config.closeSameLevel) this.closeLevel(cn);
};

// Open or close all nodes
dTree.prototype.oAll = function(status) {
	for (var n=0; n<this.aNodes.length; n++) {
		if (this.aNodes[n]._hc && this.aNodes[n].pid != this.root.id) {
			this.nodeStatus(status, n, this.aNodes[n]._ls)
			this.aNodes[n]._io = status;
		}
	}
};

// Opens the tree to a specific node
dTree.prototype.openTo = function(nId, bSelect, bFirst) {
	if (!bFirst) {
		for (var n=0; n<this.aNodes.length; n++) {
			if (this.aNodes[n].id == nId) {
				nId=n;
				break;
			}
		}
	}
	var cn=this.aNodes[nId];
	if (cn.pid==this.root.id || !cn._p) return;
	cn._io = true;
	cn._is = bSelect;
	if (this.completed && cn._hc) this.nodeStatus(true, cn._ai, cn._ls);
	if (this.completed && bSelect) this.s(cn._ai);
	else if (bSelect) this._sn=cn._ai;
	this.openTo(cn._p._ai, false, true);
};

// Closes all nodes on the same level as certain node
dTree.prototype.closeLevel = function(node) {
	for (var n=0; n<this.aNodes.length; n++) {
		if (this.aNodes[n].pid == node.pid && this.aNodes[n].id != node.id && this.aNodes[n]._hc) {
			this.nodeStatus(false, n, this.aNodes[n]._ls);
			this.aNodes[n]._io = false;
			this.closeAllChildren(this.aNodes[n]);
		}
	}
}

// Closes all children of a node
dTree.prototype.closeAllChildren = function(node) {
	for (var n=0; n<this.aNodes.length; n++) {
		if (this.aNodes[n].pid == node.id && this.aNodes[n]._hc) {
			if (this.aNodes[n]._io) this.nodeStatus(false, n, this.aNodes[n]._ls);
			this.aNodes[n]._io = false;
			this.closeAllChildren(this.aNodes[n]);		
		}
	}
}

// Change the status of a node(open or closed)
dTree.prototype.nodeStatus = function(status, id, bottom) {
	eDiv	= document.getElementById('d' + this.obj + id);
	eJoin	= document.getElementById('j' + this.obj + id);
	if (this.config.useIcons) {
		eIcon	= document.getElementById('i' + this.obj + id);
		eIcon.src = (status) ? this.aNodes[id].iconOpen : this.aNodes[id].icon;
	}
	eJoin.src = (this.config.useLines)?
	((status)?((bottom)?this.icon.minusBottom:this.icon.minus):((bottom)?this.icon.plusBottom:this.icon.plus)):
	((status)?this.icon.nlMinus:this.icon.nlPlus);
	eDiv.style.display = (status) ? 'block': 'none';
};




//Click the CheckBox ,check it's Father Node and Child nodes.
dTree.prototype.cc=function(nodeId){
   var cs = document.getElementById("c"+this.obj+nodeId).checked;
   var n,node = this.aNodes[nodeId];
   var len = this.aNodes.length;
   for (n=0; n<len; n++) {
    if (this.aNodes[n].pid == node.id) {
     document.getElementById("c"+this.obj+n).checked=cs;
     this.cc(n);
    }
   }
   if(cs==false)return;
   var pid=node.pid;
   var bSearch;
   do{
    bSearch=false;
    for(n=0;n<len;n++){
     if(this.aNodes[n].id==pid){
      document.getElementById("c"+this.obj+n).checked=true;
      pid=this.aNodes[n].pid;
      bSearch= true;   
      break;
     }
    }
   }while(bSearch==true);
}

// If Push and pop is not implemented by the browser
if (!Array.prototype.push) {
	Array.prototype.push = function array_push() {
		for(var i=0;i<arguments.length;i++)
			this[this.length]=arguments[i];
		return this.length;
	}
};
if (!Array.prototype.pop) {
	Array.prototype.pop = function array_pop() {
		lastElement = this[this.length-1];
		this.length = Math.max(this.length-1,0);
		return lastElement;
	}
};

// ���id�õ��ڵ����
dTree.prototype.getNode = function(id) {
	var nd;
		for(var i=0;i<this.aNodes.length;i++){
			nd = this.aNodes[i];
			if(nd.id==id){
				break;
			}
		}
		return nd;
	}
	
// ���id�õ��ڵ�IJ㼶
dTree.prototype.getNodeLevel = function(id) {
		var cn = this.aNodes[id];
		var level = 0;
		for(;;){
			if(cn._p.id==this.root.id){
				break;
			}
			level++;
			cn = cn._p;
		}
		return level;
	}

//�ж��Dz���Ҷ��Ŀ¼
dTree.prototype.isLeaf = function (nodeId){
	var cn = this.aNodes[nodeId];
	return cn._hc;
}