展开、折叠的垂直两级菜单，可用到后台左侧

答案：<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript"></script>
<title>展开、折叠的垂直两级菜单</title>
<style type="text/css">
body {font-family:Arial, Helvetica, sans-serif;font-size:12px;width:166px;margin:0 auto;}
ul,h5{margin:0;padding:0;list-style:none;}
#levelmenu{margin:8px 0 0 8px;}
#levelmenu div.unit ul{width:127px;border:solid 1px #1A5189;border-top:none;padding:8px 0 8px 20px;}
#levelmenu h5{width:149px;height:25px;line-height:26px;overflow:hidden;background:#515E7B url() left top no-repeat;text-indent:30px;font-weight:normal;color:#fff;margin:0;font-size:100%;cursor:default;}
#levelmenu div.unit ul{display:none;line-height:23px;}
 #levelmenu div.current ul{display:block;}
  #levelmenu div.current ul li a{color:#3B475F;text-decoration:none;}
   #levelmenu div.current ul li a:hover{text-decoration:underline;}
 #levelmenu div.current h5{background-position:left bottom;}
</style>
</head>
<body>
<div id="levelmenu">
 <div class="unit current">
  <h5>网站设置</h5>
  <ul>
   <li><a href="/">基础设置</a></li>
   <li><a href="/">上传设置</a></li>
  </ul>
 </div>
 <div class="unit">
  <h5>新闻管理</h5>
  <ul>
   <li><a href="/">新闻列表</a></li>
   <li><a href="/">添加新闻</a></li>
   <li><a href="/">新闻评论</a></li>
  </ul>
 </div>
 <div class="unit">
  <h5>图片管理</h5>
  <ul>
   <li><a href="/">上传图片</a></li>
   <li><a href="/">图片清理</a></li>
  </ul>
 </div>
 <div class="unit">
  <h5>会员管理</h5>
  <ul>
   <li><a href="/">添加会员</a></li>
   <li><a href="/">管理会员</a></li>
   <li><a href="/">权限设置</a></li>
  </ul>
 </div>
</div>
</body>
</html>
<script type="text/javascript">
function init(){
 if(!document.getElementById || !document.getElementsByTagName){retun;}
 var arrayDiv=document.getElementById("levelmenu");

 if(!arrayDiv){return;}
 var divObj=arrayDiv.getElementsByTagName("div");
 var length=divObj.length;
 var agreeDiv=new Array();
 for(var i=0;i<length;i++){
  if(divObj[i].className.indexOf("unit")>=0){
   agreeDiv.push(divObj[i]);
   divObj[i].onclick=function(event){
    showCurrentMenu(agreeDiv,this,event);
   }
  }
 }
}
function showCurrentMenu(agreeDiv,currentObj,event){
 if(!event){event=window.event;} 
 var eventObj=event.srcElement?event.srcElement:event.target;
 
 var length=agreeDiv.length;
 for(var i=0;i<length;i++){
  if(eventObj.parentNode==agreeDiv[i] || eventObj.nodeName!="H5"){continue;}
  agreeDiv[i].className="unit";
 }
 if(eventObj.nodeName=="H5"){
  if(eventObj.parentNode.className=="unit"){
   eventObj.parentNode.className="unit current"
  }else{
   eventObj.parentNode.className="unit"
  }
 }
}
init();
</script>
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