树形结构的源码，简单易用functiondTree(objName){this.config={target:null,folderLinks:true,useSelection:true,useCookies:true,useLines:true,useIcons:true,useStatusText:false,closeSameLevel:false,inOrder:false};this.icon={root:"img/base.gif",folder:"img/folder.gif",folderOpen:"img/folderopen.gif",