JS实现鼠标悬停显示头像与文章详情的列表效果

<!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>
<title>鼠标滑过标题列表显示说明和图片</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">
<style type="text/css">
*{margin:0;padding:0;font:normal 12px 宋体;}
.wrapper{width:300px;height:auto;overflow:hidden;border:1px solid #fdd78d;background:#ffecc6;padding:5px;}
/*平常的状态*/
dl{width:100%;height:auto;clear:both;overflow:hidden;margin:8px 0px 8px 0px;}
dl dt{display:none;}
dl dd{}
dl dd strong{float:left;margin-right:5px;}
dl dd div{float:left;width:270px;list-style-type:none;}
dl dd div h4{clear:both;font-weight:normal}
dl dd div h4 a{float:left;color:#795601;font-size:12px;font-weight:normal;text-decoration:none;}
dl dd div h4 a:hover{color:#f00;text-decoration:underline;}
dl dd div h4 span{float:right;width:75px;}
dl dd div p{display:none;}
/*鼠标划过的状态*/
dl.over{clear:both;height:55px;padding:5px;background-color: #FFFBF4;}
dl.over dt{float:right;display:block;}
dl.over dt img{border:1px solid #ccc;padding:1px;background:#fff;}
dl.over dd{float:left;}
dl.over dd strong{font-size:28px;color:red;vertical-align:top;}
dl.over dd div{float:left;width:195px;}
dl.over dd div h4{clear:both;font-weight:normal}
dl.over dd div h4 a{color:#b34408;}
dl.over dd div h4 a:hover{color:#f00;text-decoration:underline;}
dl.over dd div h4 span{float:right;}
dl.over dd div p{clear:both;display:block;margin-top:5px;}
</style>
<script language="javascript">
window.onload=function(){
 var dl=document.getElementsByTagName("dl");
 if(dl.length<1) return false;
 for(var i=0;i<dl.length;i++){
  //初始化，让第一个类为over
  if(dl[i].className.indexOf("over")==-1){
   dl[0].className="over";
  }
  //遍历循环，模拟:hover伪类
  dl[i].onmouseover=function(){
   for(var j=0;j<dl.length;j++){
    dl[j].className="";
   }
   this.className="over";
  }
 }
}
</script>
</head>
<body>
<div class="wrapper">
 <dl>
  <dt><img src="images/getface.jpg"></dt>
  <dd>
   <strong>01</strong>
   <div>
    <h4><span>人气：19045</span><a href="#">酷站展示</a></h4>
    <p>300M独立IP双线空间 100元/年</p> 
   </div>
  </dd>
 </dl>
 <dl>
  <dt><img src="images/getface.jpg"></dt>
  <dd>
   <strong>02</strong>
   <div>
    <h4><span>人气：34534</span><a href="#">视频教程</a></h4>
    <p>1G全能空间仅99元 免备案</p> 
   </div>
  </dd>
 </dl>
 <dl>
  <dt><img src="images/getface.jpg"></dt>
  <dd>
   <strong>03</strong>
   <div>
    <h4><span>人气：79789</span><a href="#">loading素材</a></h4>
    <p>网罗网络最新flash动画、素材</p> 
   </div>
  </dd>
 </dl>
 <dl>
  <dt><img src="images/getface.jpg"></dt>
  <dd>
   <strong>04</strong>
   <div>
    <h4><span>人气：4323</span><a href="#">flash片头</a></h4>
    <p>企业建网站100元起,送源码</p> 
   </div>
  </dd>
 </dl>
 <dl>
  <dt><img src="images/getface.jpg"></dt>
  <dd>
   <strong>05</strong>
   <div>
    <h4><a href="#">flash动画</a><span>人气：6456</span></h4>
    <p>全国最低价 服务器年付仅2000元</p> 
   </div>
  </dd>
 </dl>
</div>
</body>
</html>