forumhome image map-project
 

I would like to have a small module with an image in it either in the right of the header or in my left sidebar i have on my forumhome that when a user points there mouse to a certain forum category, the image in that module changes.

like if i had a category called "cars" and 1 called "trucks" and the users mouse pointed to one of those forums, the image in the module would be a car or a truck appropriatley. I already know how to make the modules themselves, i just dont know what kind of code to put in it for the image placeholder. Is there any way to do this and can it be done without javascript?