How to create a floating menu

Question

Need some advice on creating a floating menu that behaves very similar to what is used on the apple website shopping cart. I've seen some scripts that do something like this (and we've tried one) but they tend to "lag" behind the movement while apple's version gives the appearance of being stationary. A jQuery solution would be preferable.

Answer 1

Well, looks like they are switching from relative positioning to fixed. Works better than what most people do, which is simply scroll it down more as the window is scrolled down more.

You can detect how scrolled down the window is by following what is done in the following link.