Sorry, I removed the code. You viewed it w/o the code. The button shows up fine when the code isn't there.
I noticed that this was affecting the LOGIN button as well. So I was wrong about it not affecting any other button...I just had not noticed it before.
I don't think that this is possible (rollovers + vbulletin code). But I'm willing to put the code back up to anyone who wants to give it a try. hehe