Best 3-level dropdown menu options (CSS only, no images)?

[webdev]

I like the speed of the one at Horizontally Centered Drop-Down Menus with Pure CSS (http://matthewjamestaylor.com/blog/c...dropdown-menus) but it is only a 2-level menu as far as I can tell. Can that be modified easily to become a 3-level menu? If not, that should at least give you an idea...