<!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" />
<title>css-tab切换</title>
<style>
<!--
*{
margin:0;padding:0;list-style:none;font-size:12px;}
#content{
width:300px;margin:10px auto;position:relative;border:1px solid #666;}
ul{
width:20px;height:100px;position:absolute;right:5px;top:100px;}
ul li{height:33px;}
ul li a{
display:block;width:20px;height:20px;line-height:20px;text-align:center;color:#000;background:#ccc;text-decoration:none;}
ul li a:hover{color:#fff;background:#666;}
#tabTxt{height:300px;overflow:hidden;}
#a1,#a2,#a3{width:300px;height:300px;}
-->
</style>
</head>
<body>
<div id="content">
<ul>
<li><a href="#a1">1</a></li>
<li><a href="#a2">2</a></li>
<li><a href="#a3">3</a></li>
</ul>
<div id="tabTxt">
<div id="a1" style="background:#f00">
</div>
<div id="a2" style="background:#080">
</div>
<div id="a3" style="background:#009;">
</div>
</div>
</div>
</body>
</html>
原文：http://www.cnblogs.com/surfaces/p/4206360.html