background img for each category's header in prosilver

[rabufo]

Hello,
after a lot of useless attempts, I've thought to ask to experts I read in many forums that it's possible, but not found good suggestion about how to make it. I'm using prosilver template and I need to have a different background image in each category header (only in the header), like in the img below



I've also searched here, but found about whole category background and not header only.
I hope that a good soul will help me

Thank you very much

[Patrick]

Does anyone have any thoughts on how you might accomplish this?

Thanks,

Patrick