Crisis, please help with isolating module problem!

Hi. I have expanded the products on my mystore site and i now need to use a product categoy module on the left side to list the product categories i have. On top of this module, mod_product_cateogry, there is a header, as shown on the attached photo. I need to remove this header. But when i do this(in template.css), i remove all the similar headers on the entire website! So by fixing one problem i create another. So, my problem in a nutshell, how can i make isolated css changes on a module, and remove the header on "Only" this?

Skjermbilde 2011-04-16 kl. 06.32.04.png