Audio out of synch in video clips

I’m working on a CD that will be Flash based. Unfortunately I’m having some difficulty with the video clips I am importing. I have tried importing both MPEG and Quicktime – both of which play fine on their own. When viewing them in swf or a projector, the audio isn’t in synch with the video.

The videos are all 24fps, talking heads, 320x240. I have tried different types of audio compression to no avail.

Any help would be appreciated!