代码如下 div id="jsmenu"那块显示不出来：
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title></title>
<link href="css.css" type="text/css" rel="stylesheet" media="all" />
<script src="menu.js" type="text/javascript"></script>
<style type="text/css">
<!--
.STYLE1 {font-size: 16px}
.STYLE2 {
color: #CCCCCC;
font-size: 14px;
}
.STYLE3 {font-size: 14px}
-->
</style>
</head>
<body>
<div id="topexplain">欢迎进入培训学校管理系统！</div>
<div id="topmenu"><img src="images/banner.jpg" width="970" height="147" /></div>
<div id="bookmunu">
<div class="jsmenu" id="jsmenu">
<ul>
<li class="active"><a href="index.jsp" urn="#default_Info" rel="conmenu">基础数据管理</a></li>
<li class="normal"><a urn="jsmenu1" rel="conmenu" href="#">报到分班管理</a></li>
<li class="normal"><a urn="jsmenu2" rel="conmenu" href="#">收费管理</a></li>
<li class="normal"><a urn="jsmenu3" rel="conmenu" href="#">宿舍管理</a></li>
</ul>
</div>
<div id="conmenu"></div>
</div>
<div id="indexfirst">
<div id="thenew">
<div class="tit">
<h1>最新消息</h1>
</div>
<div class="STYLE1" id="therecom">
</div>
</div>
<div id="menunav">
<div class="tit">
<h1>员工信息</h1>
</div>
<div id="employee">
<c:choose>
<c:when test="${empty sessionScope.employee}">
没有进行身份识别，请先进行身份识别!
</c:when>
<c:otherwise>
<ul>
<li>员工编号</li>
<li>员工姓名：</li>
<li>员工性别：</li>
<li>出生日期：</li>
<li>办公室电话：</li>
<li>住址：</li>
<li>管理层领导：</li>
</ul>
</c:otherwise>
</c:choose>
</div>
</div>
</div>
<div id="indexsec"></div>
<div class="copyright"><ul><li></li>
<li>企业日常事务管理系统 ©2009-2010</li>
</ul>
</div>
<div class="end"></div>
<script type=text/javascript>
startajaxtabs("jsmenu");
var iTab=GetCookie("nets_jsmenu");
iTab = iTab ? parseInt(iTab):parseInt(Math.random()*5);
if(iTab!=0) getElement("jsmenu").getElementsByTagName("h1")[iTab].LoadTab();
iTab++;
if(iTab>4) iTab=0;
SetCookie("nets_jsmenu",iTab,365);
function getElement(aID)
{
return (document.getElementById) ? document.getElementById(aID)
: document.all[aID];
}
</script>
</body>
</html>
