中国网站优化：js实现动态图片轮播效果

<style type="text/css"> 
.picshow { z-index:444; position:relative; background-color:#e4f2fa; width: 100%; height: 250px}
.picshow_main { position: relative; width: 690px; height: 250px}
.picshow_main .imgbig { filter: progid:dximagetransform.microsoft.wipe(gradientsize=1.0,wipestyle=4, motion=forward); width: 690px; height: 250px}
.picshow_change {position: absolute; text-align: left; bottom: 0px; height: 30px; right: 0px; left: 600px;}
.picshow_change img {width:15px; height: 15px}
.picshow_change a { border: 1px solid; display: block; float: left; margin-right: 5px;  -display: inline}
a.axx { border-color: #555}
a.axx:hover {border-color: #000}
a.axx img { filter: alpha(opacity=40); opacity: 0.4; -moz-opacity: 0.4}
a.axx:hover img {filter: alpha(opacity=100); opacity: 1.0; -moz-opacity: 1.0}
a.bxx { border-color: #000}
a.bxx:hover {border-color: #000}
img{
border:0px}
</style>
<SCRIPT language=javascript> 
 //图片滚动展示 Start
 var counts = 3;
 //大图//
 img1 = new Image();
 img1.src = 'http://images1.www.net.cn/static/images/index_ad100127.jpg';
 img2 = new Image();
 img2.src = 'http://images1.www.net.cn/static/images/index_ad091225.jpg';
 img3 = new Image();
 img3.src = 'http://images1.www.net.cn/static/images/index_ad091230.jpg';
 
 var smallImg = new Array();
 //小图
 smallImg[0] = 'http://images1.www.net.cn/static/images/index_adb1.gif';