How do I put 100s of forums in a dropdown?

[lingstar]

Hello,

Does anyone know how to put a massive amount of categories
into a dropdown like seen at

http://www.dogster.com/forums/home.php

About half-way down the page, there's a dropdown for
Breed-specific forums (over 100 of them). Since putting
hundreds of forums on the homepage is quite the overkill,
I like how that was done....anyone know how to accomplish
the same thing in vbulletin?

Thanks in advance,

Barbara