急！求一功能代码！

类似于http://music.xunlei.com/上的图片切换功能，点击左面的内容，右面的图片也相应的变换
希望高手能分享代码，谢谢了，急用！
这是迅雷网页上的代码，但是没看明白，希望高手帮忙！
<script>

function cleanallstyle() {
for (i=0;i<7;i++) {
document.getElementById("focus_"+i).className = "" ;
}
}
function show_focus_image(index) {
clearTimeout(refreshHotQueryTimer);
setHotQueryList(index);
refreshHotQueryTimer = setTimeout('refreshHotQuery();', 5000);
}
function setClick() {
clearTimeout(refreshHotQueryTimer);
}
  var refreshHotQueryTimer = null ;
  var hot_query_td =  document.getElementById('HotSearchList');
  setHotQueryList(CurrentHotScreen);
  refreshHotQueryTimer = setTimeout('refreshHotQuery();', 5000); </script><body>
    <form id="form1" runat="server">
    <div>
    <table><tr><td id="HotSearchList" style="filter: progid=DXImageTransform.Microsoft.GradientWipe(GradientSize=0.25,wipestyle=0,motion=forward);">
<div id="switch_0"><a  href="http://music.xunlei.com/contents/01/170754.shtml" onclick="setClick();" blockid="931"><img src="http://images.movie.xunlei.com/gallery/468/e52bc850caeb55346290bbb68e948f38.jpg" alt="蔡依林奥运嘉年华献唱 热舞泄春光"></a></div>
<div id="switch_1"><a  href="http://music.xunlei.com/contents/8c/169075.shtml" onclick="setClick();" blockid="931"><img src="http://images.movie.xunlei.com/gallery/468/358e14d8f3bb1ce23828477806444691.jpg" alt="温岚叶乃文京城斗舞 台上大秀性感"></a></div>
<div id="switch_2"><a  href="http://music.xunlei.com/contents/ee/169003.shtml" onclick="setClick();" blockid="931"><img src="http://images.movie.xunlei.com/gallery/468/893d61cb2a6935f0a205070de97e2bb7.jpg" alt="李小璐全新MV 性感舞姿酷似蔡依林"></a></div>
<div id="switch_3"><a  href="http://music.xunlei.com/contents/9d/168344.shtml" onclick="setClick();" blockid="931"><img src="http://images.movie.xunlei.com/gallery/468/6bc13ce09e367f6b598e42196039edd0.jpg" alt="陈怡声明 澄清自己并非进入AV界"></a></div>
<div id="switch_4"><a  href="http://music.xunlei.com/contents/61/168087.shtml" onclick="setClick();" blockid="931"><img src="http://images.movie.xunlei.com/gallery/468/59b5c450e25727027f3ea3706c200de3.jpg" alt="陈楚生萧敬腾正面PK 只有大家赢"></a></div>
<div id="switch_5"><a  href="http://music.xunlei.com/contents/72/167489.shtml" onclick="setClick();" blockid="931"><img src="http://images.movie.xunlei.com/gallery/468/a6f55752925c80947c29ec3790949c39.jpg" alt="张杰杭州个唱再掀人气风暴(组图)"></a></div>
<div id="switch_6"><a  href="http://music.xunlei.com/contents/56/167459.shtml" onclick="setClick();" blockid="931"><img src="http://images.movie.xunlei.com/gallery/468/2074333f9c6ad42dfd8d4fc6f7f2a629.jpg" alt="李孝利比基尼写真秀身材 性感露蛮腰"></a></div>
</td></tr></table>
    <ul>
    <li><a  href="http://music.xunlei.com/contents/01/170754.shtml" title="蔡依林奥运嘉年华献唱 热舞泄春光" id="focus_0" class="up" onmouseover="show_focus_image(0);" onclick="setClick();" blockid="931">蔡依林奥运嘉年华献唱 热舞泄春光</a></li>
    <li><a  href="http://music.xunlei.com/contents/8c/169075.shtml" title="温岚叶乃文京城斗舞 台上大秀性感" id="focus_1" onmouseover="show_focus_image(1);" onclick="setClick();" blockid="931">温岚叶乃文京城斗舞 台上大秀性感</a></li>
<li><a  href="http://music.xunlei.com/contents/ee/169003.shtml" title="李小璐全新MV 性感舞姿酷似蔡依林" id="focus_2" onmouseover="show_focus_image(2);" onclick="setClick();" blockid="931">李小璐全新MV 性感舞姿酷似蔡依林</a></li>
    </ul>
    </div>
    </form>
</body>
</html>