Help with framerate / sync problems

I just got done with an intro to my lit project www.prism.gatech.edu/~gtg463r/flashproject.html
the problem im having is that the sound is off-sync with the animation on just about every computer except my own (and obviously it’s going to work on my computer since i sync’d the animation on it), so my question is: is there a way to somehow make it so that the animation is sync’d on all computers? there must be a way since i’ve seen some stuff out there where the animation is synced to an entire 5 minute song.