本文介绍用javascript制作图片轮换效果，原理很简单，就是设置延时执行一个切换函数，函数里面是先设置下面的缩略图列表的白框样式，再设置上面大图的src属性，在IE中显示很正常，可是在FF中会有变成先显示上面的大图
<!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="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
body{ font-family:Arial, Verdana, Helvetica, sans-serif, "宋体"; font-size:14px;}
a{ color:#fff;}
img{ border:0;}
#picBox{ width:335px; border:1px solid #000; height:317px; position:relative;}
.pic img{ width:335px; height:251px; filter:BlendTrans(duration=1);}
.txtbg{height:40px; background:#000; position:relative; margin-top:-40px; filter:alpha(opacity=50); opacity:0.5;}
.text{ line-height:40px; text-align:center;position:relative; margin-top:-40px;}
.thumbs{ position:absolute; margin-top:-4px;}
.thumbs a{ padding-top:4px; position:relative; cursor:pointer; float:left; margin-right:-3px; width:86px; height:66px;}
.thumbs img{ border:3px solid #777; width:80px; height:60px;}
.thumbs .cur{ background:url(http://img1.cn.msn.com/1/arrow2.gif) no-repeat center top; z-index:2;}
.thumbs .cur img{ border-color:#fff;}
</style>
</head>
<body>
<div id="picBox">
<div class="pic"><a href="1"><img src="http://www.98desk.com/d/0/5/84/2006110819532871609.jpg" id="curPic" /></a></div>
<div class="txtbg"></div>
<div class="text"><a id="picLink" href="#">news link 图片链接</a></div>
<div class="thumbs" id="thumbList">
<a id="thumb_0" href="1"><img src="http://www.98desk.com/d/0/5/84/2006110819532871609.jpg" title="aaaaaa"/></a>
<a id="thumb_1" href="2"><img src="http://pic.yule13.com/big/ktdm/200706/02/1843311092.jpg" title="bbbbbb"/></a>
<a id="thumb_2" href="3"><img src="http://www.haotuku.com/katong/sishen/066cn.jpg" title="cccccc"/></a>
<a id="thumb_3" href="4"><img src="http://pic.yule13.com/big/ktdm/200706/02/1843566662.jpg" title="dddddd"/></a>
</div>
</div>
http://www.98desk.com/d/0/5/84/2006110819532871609.jpg<br />
http://pic.yule13.com/big/ktdm/200706/02/1843311092.jpg<br />
http://www.haotuku.com/katong/sishen/066cn.jpg<br />
http://pic.yule13.com/big/ktdm/200706/02/1843566662.jpg<br />
</body>
</html>
<script type="text/javascript">
function $(id){return document.getElementById(id)}
var focIdx=0,nextIdx=0,timer;
var thumbs=$("thumbList").getElementsByTagName("A");
function setFocus(pic){
if(focIdx!=null)thumbs[focIdx].className="";
pic.className="cur";
focIdx=parseInt(pic.id.substring(pic.id.indexOf("_")+1,pic.id.length));
var plink=$("picLink");
plink.innerHTML=pic.getElementsByTagName("IMG")[0].title;
plink.href=pic.href;
var curPic=$("curPic");
if(curPic.filters){
curPic.filters[0].apply();
curPic.filters[0].play();
}
curPic.src=pic.getElementsByTagName("IMG")[0].src;
focIdx<3?nextIdx=focIdx+1:nextIdx=0;
timer=setTimeout("setFocus(thumbs[nextIdx])",2000);
}
window.onload=function(){
for(var i=0;i<thumbs.length;i++){
thumbs[i].onmouseover=function(){
if(timer){clearTimeout(timer)};
setFocus(this);
}
}
setFocus(thumbs[0]);
}
</script>
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