Yeah it has an AGP slot in it, so any AGP card will be good. Make sure its AGP before you buy it though.
Edit: Dang, I spoke too soon, you may need to get a new case to be able to upgrade you video card. You case is only half height so it wont work with normal AGP cards.
the internals of that computer is the same of mine but mine looks different, my case is about 19-20 inches high and about 7.5 inches wide. is that big enough?