<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<link href="style.css" rel="stylesheet" type="text/css" />
<style type="text/css">
#pingfen .cg {background:url(star.gif) no-repeat 0 -29px; }
</style>
</head>
<body>
<div id="pingfen">
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
</div>
<script>
window.onload=function(){
var oLi=pingfen.getElementsByTagName('li');
for(var i=0;i<oLi.length;i++){
oLi[i].index=i;
oLi[i].onmouseover=function(){
for(var i=0;i<oLi.length;i++){
oLi[i].className=''
}
for(var i=0;i<=this.index;i++){
oLi[i].className='cg';
}
this.className='cg';
}
}
}
</script>
</body>
</html>
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