实在没办法了，请各位高手帮忙看下:为什么图片切换没有效果？(document.all和document.form)

源码如下：        <script language="JavaScript"> 
        <!--
            var bannerADrotator = document.getElementById("bannerADrotator");
            var bannerAD = new Array();
            var bannerADlink = new Array();
            var adNum = 0;
            bannerAD[0] = "http://www.mslshotel.com/uploadfile/1010140516591.jpg";
            bannerADlink[0] = "http://www.mslshotel.com/uploadfile/1010140516591.jpg"
            bannerAD[1] = "http://www.mslshotel.com/uploadfile/1010140517271.jpg";
            bannerADlink[1] = "http://www.mslshotel.com/uploadfile/1010140517271.jpg"
            bannerAD[2] = "http://www.mslshotel.com/uploadfile/1010140523561.jpg";
            bannerADlink[2] = "http://www.mslshotel.com/uploadfile/1010140523561.jpg"
            bannerAD[3] = "http://www.mslshotel.com/uploadfile/1010140523251.jpg";
            bannerADlink[3] = "http://www.mslshotel.com/uploadfile/1010140523251.jpg"
            bannerAD[4] = "http://www.mslshotel.com/uploadfile/1010140523031.jpg";
            bannerADlink[4] = "http://www.mslshotel.com/uploadfile/1010140523031.jpg"            var preloadedimages = new Array();
            for (i = 1; i < bannerAD.length; i++) {
                preloadedimages[i] = new Image();
                preloadedimages[i].src = bannerAD[i];
            }            function setTransition() {
                if (document.all) {
                    bannerADrotator.filters.revealTrans.Transition = 3; 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()", 2000);
            }            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>
        <img style="filter: revealTrans(duration=2,transition=3)" id="bannerADrotator" border="0" name="bannerADrotator" align="middle" src="http://www.mslshotel.com/uploadfile/1010140516591.jpg" width="864" height="305">
        <script language="JavaScript" type="text/javascript">
            nextAd();
        </script>以上代码如果不放在<form>标签中，可正常显示，并有图片的切换效果。如果放入<form>标签中，就没有图片的切换效果，而且还会出错。我试着将document.all改为document.form，图片可以切换显示，但没有切换的效果。请各位高手帮忙看下。谢谢