Here is a way to add multiple banners to your site with an html module.

first create a banners.html file on your pc, and add this code.
Be sure to set your images in the adImages = new Array ( image links here ) and also the image within the body to point to your image locations.

You can also change the speed in the setTimeout( 2 * 5000 ).
//setTimeout(function, milliseconds);

My banner sizes are normally 900 x 100, this size works well for my site.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN">
<html>
<head>

<title>Rotating Banners</title>

<script language="Javascript" type="text/javascript">

adImages = new Array("images/pb.png", "images/wf.png" )

thisAd = 0
imgCt = adImages.length

function rotate(){
if( document.images ){
thisAd++
if( thisAd == imgCt ){
thisAd = 0
}
document.adBanner.src=adImages[thisAd]
setTimeout("rotate()", 2 * 5000)
}
}
</script>
</head>

<body onload="rotate()">

<center><img src="images/wf.png" name="adBanner" alt="Ad Banner" /></center>

</body>
</html>

when your done, upload it to your forum directory.

then add a html module were you want it and add this line here.

<iframe src="http://www.YOURSITE.com/forums/banners.html" width='99%' height='120'></iframe>

Be sure to edit the link and put your site domain. and save it.
thats it all done, your banners should display rotate.

This can work with all vBulletin versions, or any software actually.