我在凤凰网 www.ifeng.com首页看到一个不错的效果，就是几张图片连续不断的切换。
但是我把代码拷贝过来只能显示第一张，没有切换，我想各位研究Php，肯定有人对javascript和html比较熟悉，请各位帮忙看一下，我漏了什么重要的东西么？
以下是代码：
<!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="X-UA-Compatible" content="IE=EmulateIE7" />
<meta http-equiv="X-UA-Compatible" content="IE=7" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>凤凰网</title>
<style type="text/css">
.content{width:950px;margin:9px auto 0 auto;background:#fff;padding:0 0 2px 0;}
.contentL{float:left;display:inline;width:651px;margin:0 9px;}
.contentR{float:right;width:281px;}
.contentL1{float:left;width:275px;}
.contentL2{float:right;width:343px;padding:0 10px 0 23px;}
#focusPic{float:left;padding-bottom:2px; width:275px; height:230px;}
#focusPic ul{float:left; width:275px;background:url(
http://img.ifeng.com/tres/TemplateRes/27353/27353/images/ifeng/focuspic2.gif) no-repeat right top;}
#focusPic li{float:left; width:39px; height:26px;background:url(
http://img.ifeng.com/tres/TemplateRes/27353/27353/images/ifeng/focuspic.gif) no-repeat left;line-height:24px;text-align:center; font-weight:bold;}
#focusPic li a,#focusPic li a{color:#666;text-decoration:none; line-height:26px;}
#focusPic li.current{width:39px; height:26px; line-height:24px;background:url(
http://img.ifeng.com/tres/TemplateRes/27353/27353/images/ifeng/focuspic.gif) no-repeat right;}
#focusPic li.current a,#focusPic li.current a{color:#fff;text-decoration:underline;}
#focusPic .pic{float:left;position:relative;width:275px; height:200px; }
#focusPic .textbg{position:absolute; top:170px; left:0;width:275px;height:30px;z-index:15; background:#000; filter:alpha(opacity=60);-moz-opacity:0.6;opacity:0.6;}
#focusPic .text{position:absolute; top:170px; left:0;width:275px;height:30px;z-index:16; text-align:center; color:#fff;font-weight:bold;}
#focusPic .text a{color:#fff; line-height:30px;}
</style>
</head>
<body>
<div class="content" style="background:#fff url(
http://img.ifeng.com/tres/TemplateRes/27353/27353/images/ifeng2/blockbg.gif) repeat-y; margin-top:0;">
<div style="background:#fff url(
http://img.ifeng.com/tres/TemplateRes/27353/27353/images/ifeng2/blockbg.gif) repeat-y;height:14px;"></div>
<div class="contentL">
<div class="contentL1">
<div id="focusPic">
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<li id="t3"><a href="http://finance.ifeng.com/" target="_blank">财经</a></li>
<li id="t2"><a href="http://auto.ifeng.com/" target="_blank">汽车</a></li>
<li id="t4"><a href="http://ent.ifeng.com/" target="_blank">娱乐</a></li>
<li style="width:40px;" id="t5"><a href="http://fashion.ifeng.com/" target="_blank">时尚</a></li>
<li id="t6"><a href="http://news.ifeng.com/history/" target="_blank">历史</a></li>
<li id="t7"><a href="http://v.ifeng.com/documentary/" target="_blank">纪实</a></li>
</ul>
<div class="pic" id="s1">
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<div class="pic" id="s3" style="display:none;">
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