Use universal remote with Mac

Hi all, I've been using Plex for a while now (try it out, best media center app in my opinion) and everything is great. I use it with my Apple Remote, but it's been missing for 3 days, and I don't want to spend the 20 bucks or so. Is there any, aaany way of using a remote other than apples (e.g. my TV or DVD remote) with Mac? Thanks, all! I've done some googling without any luck, and I don't wanna buy a harmony remote.