Well, I'm pretty sure functions.php is included globally. To test that, I stuck
in there, and then until I removed it, it showed the text "test" on every page in my forum. I feel kind of stupid now, anyway. I forgot to post why it didn't work (duh)
See the problem is, when I put that into my templates, I get something like "Unexpected ( on the line that you edited. We want }" :P