JavaScript切换图片在FireFox中为何无效果？解决思路

<table width="535" height="215" border="0" cellpadding="0" cellspacing="0">
<tr>
<td width="450" height="215">

<script language="JavaScript"> //js代码               
    var bannerAD = new Array(); //用于存放图片路径（相对路径）
    var adNum = 0;        
    bannerAD[0] = "image/home1.jpg";
    bannerAD[1] = "image/home2.jpg";
    bannerAD[2] = "image/home3.jpg";
  

function setTransition() {
    if (document.all) {
        bannerADrotator.filters.revealTrans.Transition = Math.floor(Math.random()*23);//设置图片切换
        bannerADrotator.filters.revealTrans.apply(); //应用图片切换
    }
}            

function playTransition(){
    if (document.all)
        bannerADrotator.filters.revealTrans.play() //播放图片
}            

function nextAd(){
    if (adNum < bannerAD.length - 1) 
        adNum++;
    else 
        adNum = 0;
    setTransition();
    document.images.bannerADrotator.src = bannerAD[adNum];
    playTransition();
    theTimer = setTimeout("nextAd()", 5000); //5秒钟切换一张图片
}                          
</script>                            

<img style="FILTER: revealTrans(duration=2,transition=20)" height=292 src="" width=515 border=1 name=bannerADrotator>
<SCRIPT language="JavaScript">nextAd()</SCRIPT>

</td>
</tr>
</table>