I used the minor hack supplied in this thread:
http://www.vbulletin.com/forum/showt...es+replacement
(minus the text formatting that slipped into the first code box)
At first I thought it didn't work but at some point in the last few minutes it took effect and seems to be working just fine.
I don't know if there's a better way to do it but so far this seems like the easiest and most logical way.