the hover pseudo classes are CSS. It is a "pure CSS" menu.
if you look at the css for their demo menu:
it also uses the hover psuedo class.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.