在asp网页中在一个<td></td>中使得图片切换怎么做啊

<SCRIPT type=text/javascript>

var imgUrl=new Array();
var imgLink=new Array();
var imgText=new Array();
var picNum=0;
<!--滚动图片：开始-->

imgUrl[1]="upload/center_news/system2007510144917img2.gif";
imgLink[1]="newxx.aspx?id=22";
imgText[1]="中国元级潜艇的性能让西方大吃一惊";
imgUrl[2]="upload/center_news/system200751014500img1.jpg";
imgLink[2]="newxx.aspx?id=22";
imgText[2]="中国元级潜艇的性能让西方大吃一惊";
imgUrl[3]="upload/center_news/system20075109276img1.jpg";
imgLink[3]="newxx.aspx?id=18";
imgText[3]="中国军人以自信姿态走向世界扬军威(图)";
imgUrl[4]="upload/center_news/system200751092616img1.jpg";
imgLink[4]="newxx.aspx?id=17";
imgText[4]="台军拟购120架直升机 3年内升级现役直升机(图)";
imgUrl[5]="upload/center_news/system200751092552img1.jpg";
imgLink[5]="newxx.aspx?id=16";
imgText[5]=&qu