Different ads under different categories

On my blog LastVoice.com I have numerous categories. If you click on a particular category it obviously brings you to that category. At the top of that category I have AdSense displayed Example.

I would like the ability to display different ads from different advertisers in the location where AdSense currently is. Example – Maybe under one category I have AdSense ads but then under another category I have an affiliate ad for Acme Corporation.

Hopefully that makes sense. Any help is really appreciated!