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Claudio,
You should look into phpadsnew, it works great as a stand alone software (althogh it seems to have been ported as a XOOPS module, but I have not tried it as such), it will manage classes and types as you describe. I a have been using it for almost 2 years. You can be embed the code for the banners in either your theme.html file or into a module such as tinyD. It has excelent documentation, it requires a litle bit of reading and a little bit of trial and error, but it definetly is worth the time and effort. You can see it working at www.matamoros.com, the reloading of the banners is done by placing the actual banners in separate pages and reloading them at a fixed interval of time via javascript, and calling the pages on an I-frame on the theme.html file as well as in various tinyD modules.
Hopes this helps.
Saludos from Mexico
Rolando