Roll-Over Submenus

Hi there,
i’ve been searching this board for an answer for my question but i don’t found any answers.

i’m looking for plugin or some kind of mod that helps me build this kind of menu (here’s an example http://lubuskihiphop.com/ )
i wanna have this one on my WP but i don’t know how to build. can somebody help me and give a suggestions, tips or something.

Thanks and greetings!

ps. sorry for my english if it’s wrong. foreigner 😉