<style>
*{ margin:0; padding:0;list-style: none;}
body {font:12px/1.5 Tahoma;}
#outer {width:450px;margin:150px auto;}
#tab {overflow:hidden;zoom:1;background:#000;border:1px solid #000;}
#tab li {float:left;color:#fff;height:30px; cursor:pointer; line-height:30px;padding:0 20px;}
#tab li.current {color:#000;background:#ccc;}
#content {border:1px solid #000;border-top-width:0;}
#content ul {line-height:25px;display:none; margin:0 30px;padding:10px 0;}
</style>
</head>
<body>
<!-- html代码begin -->
<div id="outer">
<ul id="tab">
<li class="current">tab标签</li>
<li>qq在线客服代码</li>
<li>css3</li>
</ul>
<div id="content">
<ul style="display:block;">
<a href="http://www.lanrenzhijia.com/tab">tab标签</a>
</ul>
<ul>
<a href="http://www.lanrenzhijia.com/service">qq在线客服代码</a>
</ul>
<ul>
<a href="http://www.lanrenzhijia.com/js/css3">css3</a>
</ul>
</div>
</div>
<!-- html代码end -->
<script src="http://www.lanrenzhijia.com/ajaxjs/jquery.min.js"></script>
<script>
$(function(){
window.onload = function()
{
var $li = $(‘#tab li‘);
var $ul = $(‘#content ul‘);
$li.mouseover(function(){
var $this = $(this);
var $t = $this.index();
$li.removeClass();
$this.addClass(‘current‘);
$ul.css(‘display‘,‘none‘);
$ul.eq($t).css(‘display‘,‘block‘);
})
}
});
</script>
原文：http://www.cnblogs.com/jsingleegg/p/5106371.html