本原码从网上下载，经本人改写，功能更强大，使用更方便，可以有无限级目录，一次性载入，可以分别设置树结点和叶结点的颜色及图标，可以展开和收缩，可以显示当前所处的路径位置，点击树结点时只在展开时显示树结点的超链接，不过，据测试，一次性载入500个节点时浏览器会显示“该脚本会使浏览器变慢”的提示，不过，选择不取消执行不会影响浏览器的性能。
function folder(folderdescription, hreference,parentid,target) {
 //constant data;

 this.desc = folderdescription;
 this.parentid=parentid;
 this.hreference = hreference;
 this.target=target;
 this.id = index;
 this.navobj = 0;
 this.iconimg = 0;
 this.nodeimg = 0;
 this.islastnode = 0;

 // dynamic data
 this.isroot = true;
 this.isopen = true;
 this.iconsrc=../../imageurl+"ftv2folderopen.gif";
 this.iconroot =imageurl+"ftv2folderopen.gif";

 this.children = new array;
 this.nchildren = 0;

 // methods
 this.initialize = initializefolder;
 this.setstate = setstatefolder;
 this.addchild = addchild;

 this.createindex = createentryindex;
 this.hide = hidefolder;
 this.display = display;
 this.renderob = drawfolder;
 this.totalheight = totalheight;
 this.subentries = foldersubentries;
 this.outputlink = outputfolderlink;

}


function setstatefolder(isopen) {
 var subentries;
 var totalheight;
 var fit = 0;
 var i = 0;

 if(isopen == this.isopen)
 return;

 if(browserversi

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