Different newthread.gif on different forums.
 

Hello! I have a question, I hope this is the right place to post it.
I want to make a modification to my forum. And it goes like this: when the user is in a certain forum ( and in it's subforums also), newthread.gif is replaced with new_thread.gif ( a different button ). Can I do that? Can anyone guide me, please?
Thank you very much!