Does anyone know of a way to recreate a navigation menu similar to this one: http://www.s-erlich.com
using only CSS? I am looking at the "Work", "Studio", "News" menu. I want a submenu to expand underneath, simillar to when "work" is clicked. I know that that this site is done in flash, and the animation of the submenu might not be possible. But is there a clean way to do this using just CSS?