UBB.Developers Forums UBB.threads 7 Development How Do I? Limit the message area?

I've integrated my UBB into my website, and set the table widt to 480 pixels, pretty small, but it goes well with the design. Everything looks nice, except when you're about to post or reply to a topic. The message are, the one I'm typing in right now, goes beyond 480px and skrews up the design.

Any way to fix this?
My appologies if I posted in the wrong forum.

you'll need to edit the message box area in the template files for new_reply new_topic and edit

Thanks.
I checked out the files, but I couldn't find any specific variable I had to change. Could you please tell me which I can change, without fecking it up?