树形菜单默认为展开，默认为未展开，不知道改什么地方？？送100分


function TreeView(obj,target){
this.obj=obj;
this.target='right';
this.root=new node(0);
this.nodes=[]
this.currentNode=null;
this.html=""
this.config={
root :'images/tree/flag.gif',
open :'images/tree/open.gif',
close :'images/tree/close.gif',
file :'images/tree/file.gif',
join :'images/tree/T.gif',
joinbottom :'images/tree/L.gif',
plus :'images/tree/Tplus.gif',
plusbottom :'images/tree/Lplus.gif',
minus :'images/tree/Tminus.gif',
minusbottom :'images/tree/Lminus.gif',
blank :'images/tree/empty.gif',
line :'images/tree/dd.gif'
}
for(i in this.config){var tem=this.config[i];this.config[i]=new Image();this.config[i].src=tem}
}function node(id,pid,txt,link,title,target){
this.id=id
this.pid=pid
this.txt=txt
this.link=link
this.title=title
this.target=target
this.indent=""
this.lastNode=false;
this.open=false;
this.hasNode=false;

}TreeView.prototype.getP=function(nid){
var nNode=this.nodes[nid]
for(var i=0;i<this.nodes.length;i++)
if(this.nodes[i].id==nNode.pid)return i
return null
}TreeView.prototype.add=function(id,pid,txt,link,title,target){
var itemTxt=txt?txt:"New Item"
var itemLink=link?link:''
var itemTitle=title?title:itemTxt;
var itemTarget=target?target:this.target;
this.nodes[this.nodes.length]=new node(id,pid,itemTxt,itemLink,itemTitle,itemTarget)
pid==this.root.id?this.nodes[this.nodes.length-1].open=true:''
}TreeView.prototype.DrawTree=function(pNode){
var str=""
for(var i=0;i<this.nodes.length;i++){
if(this.nodes[i].pid==pNode.id){
str+=this.DrawNode(i)
}
}
return str
}TreeView.prototype.ChkPro=function(pNode){
var last;
for(var n=0;n<this.nodes.length;n++){
if(this.nodes[n].pid==pNode.id)pNode.hasNode=true;
if (this.nodes[n].pid == pNode.pid) last= this.nodes[n].id;
}
if (last==pNode.id) pNode.lastNode = true;
}TreeView.prototype.DrawNode=function(nid){
var str=""
var nNode=this.nodes[nid]
this.DrawLine(nNode,nNode)
if(nNode.hasNode)
nNode.indent+="<a  href='#' onclick='"+this.obj+".Click("+nid+",this);return(false)'>"
nNode.indent+=this.root.id!=nNode.pid?("<img align='absmiddle' src='"+(nNode.lastNode?(nNode.hasNode?this.config.plusbottom.src:this.config.joinbottom.src):(nNode.hasNode?this.config.plus.src:this.config.join.src))+"' id='icon"+this.obj+nid+"' border=0>"):""
nNode.indent+="<img id='folder"+this.obj+nid+"' align='absmiddle' src='"+(nNode.pid==this.root.id?this.config.root.src:(nNode.hasNode?(nNode.open?this.config.open.src:this.config.close.src):this.config.file.src))+"'  border=0>"+(nNode.hasNode?"</a>":"")
str+="<div class='node'><nobr>"+nNode.indent+this.DrawLink(nid)+"</nobr></div>"
if(nNode.hasNode){
str+="<div id='Child"+this.obj+nid+"' style='display:"+(nNode.pid==this.root.id?'':'none')+"'>"
str+=this.DrawTree(nNode)
str+="</div>"
}
return str;
}
TreeView.prototype.DrawLine=function(nNode,tem){
for(var i=0;i<this.nodes.length;i++){
if(this.nodes[i].id==tem.pid){
nNode.indent="<img align='absmiddle' src='"+(this.nodes[i].lastNode?this.config.blank.src:this.config.line.src)+"'>"+nNode.indent
this.DrawLine(nNode,this.nodes[i])
}
}
}TreeView.prototype.Click=function(nid,oLink){
var nNode=this.nodes[nid]
if(this.currentNode==null)this.currentNode=nid;
var current=document.getElementById('node'+this.obj+this.currentNode)
current.clasName='bbb';
if(!nNode.hasNode)return;
if(nNode.open)this.collapse(nid)
else this.expand(nid)
if(oLink)oLink.blur()

}TreeView.prototype.selected=function(nid){
if(this.currentNode==null)this.currentNode=nid;
var current=document.getElementById('node'+this.obj+this.currentNode)
var node=document.getElementById('node'+this.obj+nid)
current.className='normal'
node.className="bbb"
this.currentNode=nid
this.OpenWin(nid)
}TreeView.prototype.OpenWin=function(nid){
var nNode=this.nodes[nid]
if(!nNode.link||nNode.link=="#")return;
parent.frames["right"].location.href=nNode.link
}
TreeView.prototype.expandAll=function(){
for(i=0;i<this.nodes.length;i++)
if(this.nodes[i].hasNode)this.expand(i)
}TreeView.prototype.collapseAll=function(){
for(i=0;i<this.nodes.length;i++)
if(this.nodes[i].hasNode)this.collapse(i)
}TreeView.prototype.expandTo=function(nid){
if(this.getP(nid)!=null){
if(this.nodes[nid].hasNode)this.expand(nid)
this.expandTo(this.getP(nid))
}
}TreeView.prototype.expand=function(nid){
var node=document.getElementById('Child'+this.obj+nid)
var icon=document.getElementById('icon'+this.obj+nid)
var nNode=this.nodes[nid]
node.style.display=''
if(icon)icon.src=(nNode.lastNode?this.config.minusbottom.src:this.config.minus.src)
if(nNode.pid!=this.root.id)document.getElementById("folder"+this.obj+nid).src=this.config.open.src
nNode.open=true
}TreeView.prototype.collapse=function(nid){
var node=document.getElementById('Child'+this.obj+nid)
var icon=document.getElementById('icon'+this.obj+nid)
var nNode=this.nodes[nid]
node.style.display='none'
if(icon)icon.src=(nNode.lastNode?this.config.plusbottom.src:this.config.plus.src)
if(nNode.pid!=this.root.id)document.getElementById("folder"+this.obj+nid).src=this.config.close.src
nNode.open=false
}TreeView.prototype.DrawLink=function(nid){
var nNode=this.nodes[nid]
return "&nbsp;<span id='node"+this.obj+nid+"' class='normal' onmouseover='"+this.obj+".MouseOver(this)' onmouseout='"+this.obj+".MouseOut(this)' ondblclick='"+this.obj+".Click("+nid+")' onclick='"+this.obj+".selected("+nid+")'  title='"+nNode.title+"' style='cursor: hand;'>"+nNode.txt+"</span>"
}TreeView.prototype.MouseOver=function(o){
var nNode=document.getElementById("node"+this.obj+this.currentNode)
if(nNode!=o)o.className='MouseOver'
}TreeView.prototype.MouseOut=function(o){
var nNode=document.getElementById("node"+this.obj+this.currentNode)
o.className=nNode==o?'bbb':'normal'
}TreeView.prototype.toString=function(){
var str=""
for(var i=0;i<this.nodes.length;i++)this.ChkPro(this.nodes[i])
str+=this.DrawTree(this.root)
return str
}TreeView.prototype.open=function(){
var nid=QueryString("id")
if(isNaN(nid))return;
if(nid<0||isNaN(parseInt(nid))||nid>this.nodes.length-1)return;
this.expandTo(nid)
this.selected(nid)
}