jQuery+内嵌框架

<!DOCTYPE HTML>
<html>
<head>
<title>jQuery</title>
<style type="text/css">
 *{
   margin:0 auto;
   padding:0;
  list-style-type:none;}

 #tab{
 width:800px;
 position:relative;
 margin:40px auto;}
 #tab .tab_menu{
 width:100%;
 float:left;
 position:absolute;
 z-index:1;
}

#tab .tab_menu li{
 float:left;
 width:262px;
 height:30px;
 line-height:30px;
 border:1px solid #ccc;
 bottom:0px;
 cursor:pointer;
 text-align:center;
 margin:0 2px 0 0;
}

#tab .tab_box{
 width:794px;
 height:600px;
 clear:both;
 top:30px;
 position:relative;
 border:1px solid #CCC;
 background:green;
}

#tab .tab_menu .selected{
 background-color:#DDDDFF;
 cursor:pointer;
}

.hide{
 display:none;
}

.tab_box div{
padding:10px;
} 

#tab_menu li a{
text-style:none;
}

</style>

<script type="text/javascript" src="http://www.51sjk.com/Upload/Articles/1/0/330/330190_20220921170545249.js"></script>
<script type="text/javascript">
$(document).ready(function(){
	var $tab_li = $('#tab ul li');
	$tab_li.hover(function(){
		$(this).addClass('selected').siblings().removeClass('selected');
		var index = $tab_li.index(this);
		$('div.tab_box > div').eq(index).show().siblings().hide();
	});	
});
</script>

</head>

<body>

 <div id="tab">
	<ul >
    	   <li >w3school</li>
           <li>w3cschool</li>
           <li>jquety mobile</li>
        </ul>
     <div >
    	<div><iframe src="http://www.51sjk.com/Upload/Articles/1/0/330/330190_20220921170545749.cn" width="770px" height="580px" scrolling="yes" ></iframe></div>
        <div ><iframe src="http://www.51sjk.com/Upload/Articles/1/0/330/330190_20220921170545905.cc" width="770px" height="580px"></iframe></div>
        <div ><iframe src="http://www.lampweb.org/jquerymobile" width="770px"         height="580px"></iframe></div>
     </div>
   </div>
  <div id="description">
 
  </div>
</body>
</html>