网页特效代码:网易学院新闻图片切换特效

网页特效代码，网易学院的新闻图片切换特效，有文字详细说明，还能自动切换

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "//www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="//www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>新闻切换技术</title><style type="text/css"></style></head><body><script language="JavaScript" type="text/javascript">var nn;nn=1;setTimeout('change_img()',6000);function change_img(){if(nn>4) nn=1setTimeout('setFocus1('+nn+')',6000);nn++;tt=setTimeout('change_img()',6000);}function setFocus1(i){selectLayer1(i);}function selectLayer1(i){switch(i){case 1:document.getElementById("focusPic1").style.display="block";document.getElementById("focusPic2").style.display="none";document.getElementById("focusPic3").style.display="none";document.getElementById("focusPic4").style.display="none";document.getElementById("focusPic1nav").style.display="block";document.getElementById("focusPic2nav").style.display="none";document.getElementById("focusPic3nav").style.display="none";document.getElementById("focusPic4nav").style.display="none";break;case 2:document.getElementById("focusPic1").style.display="none";document.getElementById("focusPic2").style.display="block";document.getElementById("focusPic3").style.display="none";document.getElementById("focusPic4").style.display="none";document.getElementById("focusPic1nav").style.display="none";document.getElementById("focusPic2nav").style.display="block";document.getElementById("focusPic3nav").style.display="none";document.getElementById("focusPic4nav").style.display="none";break;case 3:document.getElementById("focusPic1").style.display="none";document.getElementById("focusPic2").style.display="none";document.getElementById("focusPic3").style.display="block";document.getElementById("focusPic4").style.display="none";document.getElementById("focusPic1nav").style.display="none";document.getElementById("focusPic2nav").style.display="none";document.getElementById("focusPic3nav").style.display="block";document.getElementById("focusPic4nav").style.display="none";break;case 4:document.getElementById("focusPic1").style.display="none";document.getElementById("focusPic2").style.display="none";document.getElementById("focusPic3").style.display="none";document.getElementById("focusPic4").style.display="block";document.getElementById("focusPic1nav").style.display="none";document.getElementById("focusPic2nav").style.display="none";document.getElementById("focusPic3nav").style.display="none";document.getElementById("focusPic4nav").style.display="block";break;}}</script><div class="focusPic"><div id="focusPic1" style="display:block ;"><div class="pic"> <a href="//kslub.cn"><img src="//images.kslub.cn/uploads/allimg/200710/20071015103731469.jpg" width="240" height="180" border="0" /></a> </div><h2><a href="//kslub.cn">网易学院05年软件评选结果</a></h2><p>经过大家的热情投票和我们的辛劳整理，网易学院2005年年度软件评选结果终于出炉啦。点击进入查看……<img src="/newimg/i2.gif" width="3" height="5" /> <a href="//kslub.cn" class="cDRed">详细</a></p></div><div id="focusPic2" style="display: none ;"><div class="pic"> <a href="//kslub.cn"><img src="//images.kslub.cn/uploads/allimg/200710/20071015103731256.jpg" width="240" height="180" border="0" /></a> </div><h2><a href="//kslub.cn">颠覆丛林动物生存法则</a></h2><p>群居动物的这种行为颠覆了我们通常认为的，在动物世界通行的 “丛林法则”，动物不都自私，不都是弱肉强食的。<img src="/newimg/i2.gif" width="3" height="5" /> <a href="//kslub.cn" class="cDRed">详细</a></p></div><div id="focusPic3" style="display: none ;"><div class="pic"> <a href="//kslub.cn"><img src="//images.kslub.cn/uploads/allimg/200710/20071015103732846.jpg" width="240" height="180" border="0" /></a> </div><h2><a href="//kslub.cn">WAPI并非贸易阴谋</a></h2><p>近日国家做出决定：“将向其他的国内及国外企业公布该算法”。事实证明中国WAPI标准并非是贸易阴谋。<img src="/newimg/i2.gif" width="3" height="5" /> <a href="//kslub.cn" class="cDRed">详细</a></p></div><div id="focusPic4" style="display: none ;"><div class="pic"> <a href="//kslub.cn"><img src="//images.kslub.cn/uploads/allimg/200710/20071015103732379.jpg" width="240" height="180" border="0" /></a> </div><h2><a href="//kslub.cn">新视野号探测冥王星特别专题</a></h2><p>美国宇航局将于北京时间18日凌晨2时24分发射新视野号探测器，造访这颗人类唯一尚未探测过的行星-冥王星。<img src="/newimg/i2.gif" width="3" height="5" /> <a href="//kslub.cn" class="cDRed">详细</a></p></div><div class="more"><div class="textNum"><div class="text">> 更多头图新闻</div><div class="num bg1" id="focusPic1nav" style="display: block;"><ul><li>1</li><li><a href="javascript:setFocus1(2);" target="_self">2</a></li><li><a href="javascript:setFocus1(3);" target="_self">3</a></li><li><a href="javascript:setFocus1(4);" target="_self">4</a></li></ul></div><div 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