That's a javascript-based menu. You might want to try in the javascript forum. If not, or if no response, try
http://www.htmldog.com/articles/suckerfish/dropdowns/. Halfway the page you will find multi-level menus.
If the Suckerfish page goes to fast for you or if you like an alternative introduction to CSS-based menus, start with my tutorial, linked from my signature.
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Frank
How to: Target IE in, Position in, Center in, Create a Fixed ('Sticky') Footer with, and Create a Drop-Down/Fly-Out Menu with CSS:
Website Laten Maken Amsterdam.