Menu recognition/type

Hi all,

Anyone know how the menu/navigation was programmed for this site:
http://slimquicklabs.com/pages/index.asp

Are they layers, dhtml, css, xml?

Also, the navigation works in Explorer, however, doesn’t function as well in Safari (I’m on a mac). The reason I ask is because I have a client who wants a similar menu, but of course, I want it to work flawlessly in all browsers. I’ve used layers before, but find their positioning unreliable at best :ponder: Could use flash, but not the clients first choice or preference.

Maybe some of you pc users can tell me if it works on your browsers?

Thanks