图片切换

<table border='"0"' cellpadding='"0"' cellspacing='"0"' align='"center"'>
<tr>
	<td>
		<script language='JavaScript'>
 var bannerAD = new Array();
 var bannerADlink = new Array();
 var adNum = 0;
 bannerAD[0] = "http: //img1.qq.com/edu/20050922/2358881.jpg"; 
 bannerADlink[0] = "http: //edu.qq.com/a/20050921/000100.htm"; 　
 bannerAD[1] = "http: //img1.qq.com/edu/20050927/2384917.jpg"; 
 bannerADlink[1] = "http: //edu.qq.com/kaoyan/yzzxh.shtml"; 
 bannerAD[2] = "http: //img1.qq.com/edu/20050928/2392784.jpg"; 
 bannerADlink[2] = "http: //edu.qq.com/photo/photo.shtml"; 
 bannerAD[3] = "http: //img1.qq.com/edu/20050922/2358906.gif"; 
 bannerADlink[3] = "http: //edu.qq.com/a/20050920/000114.htm"; 
 var preloadedimages = new Array();
 for (i = 0; i < 4; i++)
 {
 	preloadedimages[i] = new Image();
 	preloadedimages[i].src = bannerAD[i];
 }
 function setTransition()
 {
 	if (document.all)
 	{
 		bannerADrotator.filters.revealTrans.Transition = Math.floor(Math.random() * 23);
 		bannerADrotator.filters.revealTrans.apply();
 	}
 }
 function playTransition()
 {
 	if (document.all) bannerADrotator.filters.revealTrans.play()
 }
 function nextAd()
 {
 	if (adNum < bannerAD.length - 1) adNum++;
 	else adNum = 0;
 	setTransition();
 	document.images.bannerADrotator.src = bannerAD[adNum];
 	playTransition();
 	theTimer = setTimeout("nextAd()", 4000);
 }
 function jump2url()
 {
 	jumpUrl = bannerADlink[adNum];
 	jumpTarget = '_blank';
 	if (jumpUrl != "")
 	{
 		if (jumpTarget != "") window.open(jumpUrl, jumpTarget);
 		else location.href = jumpUrl;
 	}
 }
 function displayStatusMsg()
 {
 	status = bannerADlink[adNum];
 	document.returnValue = true;
 } 
</script>
		<a onmouseover='displayStatusMsg();return document.returnvalue' href='javascript:jump2url();'>
		<img style="FILTER: revealtrans(duration=2,transition=20)" height='230' src="javascript:nextAd()" width='200' border='0' name='bannerADrotator'></a>
	</td>
</tr>
</table>