Scrolling a menu - follow mouse

hey guys, Ive been doing a lot of searching but didn’t really come up with anything usefull.

from what i read it seems like a panorama effect.

but the thing is i want my menu to stop at the end.

here’s an example.

http://www.wa007.com/

click on pimpin linkage.

i love this menu system, anyone help me out here?