integrating menu with phpBB

Hello, I'm trying to integrate my drupal menu into phpBB3, but I can't see how it defines the menu bar. I've copied across the navigation div and the source code for it, but it just produces an unordered list. Presumably there's some css somewhere that sets it all into the pretty blocks, do you know off hand which divs/spans etc I need to copy across as well?

Many thanks for a great theme
Matt