Banner Ad Rotator Script - How to include an iframe banner?

I cannot post the code here. I need a javascript banner ad rotator. I used devdude[dot]c0m/tools/js/adrotator/ to create a banner rotator so if you are familiar with that site you will know what the code looks like. My first ad works fine because it is set up with a link, image and alt tag. My second ad does not work because it is in the form of an iframe and I am not sure how to change the script to use the iframe ad. I tried adding the iframe script in ("") after

if (number == 1) {
document.write

but the ad shows up as text with a broken image link in a box instead of the clickable flash image.

I am using banner ads supplied to me by my affiliate programs so I am not sure that I can change the iframe to a different format or if that will mess with tracking my sales. I hope this makes sense, I don't know much about javascript. Thanks for any advice!

OK I figured out how to include an iframe banner in the rotator. Now if I could just figure out how to get the link in the iframe to open in a new window.