在线演示：http://jsfiddle.net/Web_Code/TbPDd/embedded/result/
<!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="texthtml;charset=utf-8">
<title>TabHost</title>
<style type="text/css">
#tab li
{
background-color: #3e3e3e;
list-style: none;
float: left;
margin-left: 2px;
color: white;
}
#tabContent
{
float: left;
display: none;
width: 242px;
height: 150px;
}
#tabContent ul
{
list-style: none;
background-color: #ccc;
padding-left: 5px;
margin-top: 0px;
}
#main
{
width: 250px;
margin: 0 auto;
height: 300px;
}
</style>
</head>
<body>
<div id="main">
<div style="margin-left:-42px">
<ul id="tab">
<li onclick="javascript:display(1);" style="background-color:#ccc;color:black;">
数 据 库
</li>
<li onclick="javascript:display(2);">
前台脚本
</li>
<li onclick="javascript:display(3);">
后台脚本
</li>
</ul>
</div>
<div id="tabContent" style="display:block">
<ul>
<li>MySql</li>
<li>SQL Server</li>
<li>Oracle</li>
<li>DB2</li>
</ul>
</div>
<div id="tabContent">
<ul>
<li>HTML</li>
<li>Ruby</li>
<li>JavaScript</li>
<li>Python</li>
</ul>
</div>
<div id="tabContent">
<ul>
<li>ASP</li>
<li>PHP</li>
<li>.Net</li>
<li>JSP</li>
</ul>
</div>
</div>
<script type="text/javascript">
var divs = document.getElementById("main").getElementsByTagName("div");
var lis = document.getElementById("tab").getElementsByTagName("li");
function display(num)
{
for(var i = 1; i < divs.length; i++)
{
if(i == num)
{
var con = divs[num];
con.style.display="block";
lis[i-1].style.backgroundColor = "#ccc";
lis[i-1].style.color = "black";
}
else
{
divs[i].style.display = "none";
lis[i-1].style.color = "white";
lis[i-1].style.backgroundColor = "#3e3e3e";
}
}
}
</script>
</body>
</html>