Aligning flash in html properly

i’ve got a flash site at

and I wanna know how to make it so I can have the flash movie properly aligned vertically so it’s always in the middle no matter what resolution of the screen. I’ve got mine set to a 1024x728 so it sits fine in the middle but the client has theirs a lot higher so it looks like it sits at the very top of the screen with a lot of black space under.

can anyone help me with this?