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I use a php script called adrotator and I run it in a block on one of my sites. It allows you to put any banners or ads that you want into it and those banners/ads will display in a block on a XOOPS site.
To see it in action on my site go to
http://magazine.crazy4realitytv.com and look down the left side of the page to the block that says Reality TV Items. There I have my amazon affliate images with associated urls showing in the block. The script rotates my ads randomly in the block everytime the page is refreshed. Any size ads can be used for a block whether you want the block on the left, right or center of your page(s).
You can download the zip file here
http://www.crazy4realitytv.com/extra/adrotator.zip. In the zip file is complete instructions on how to set up the script with the ads or banners you want. There are quite a few scripts that go together to run it all.
Once you are ready to run the adrotator on your site, create your block using this code
include('adrotate.php');
and save the block as php. The adrotator.php file and any other files needed with it must be in your XOOPS root directory and not put into a subfolder. I know it works this way and I'm not sure if it would work in a subdirectory or not because I haven't tested that.