Drop Down Submenu

Guys can u help me with this dropdown menu on mousehover?

http://betasite.ca/jupiter/

Thanks so much in advance.

What is it that you would like help with exactly?

Actually I've searched for a script with that final result (except for CSS background images and colors) but I haven't find anything like that.

I tried also to get the script from that website but it's hidden very well.