Elusive smooth rollover menu - AARRRGGGHHH

Okay, here’s the situation:

I am trying to duplicate the menu system used on http://www.88phases.com

I am not sure exactly how to accomplish it. I have a menu that scrolls up and down based on mouse position, but it isn’t as smooth as the 88 phases one and won’t stop moving when you are over an active item. I am just trying to get this smooth, natural motion and it’s driving me crazy.

Does anyone have any clues or code that would be helpful in solving this problem?