How to show adsense in desired forums?

[icare]

I am looking for a hack which can help me showing adsense placed in header to show only on certial forums. I dont want to show adsense on certain forums...
is it possible?
I am looking some thing like geek advertising hack.... (unfortunatly this hack is not compatible with 3.5.x

Anybody please help.. I will highly apprecite it..

[jojo77]

yea is there a code mod for this? would be really useful as Google just wrote me and told me some of my forums aren't compliant.