[SWFObject] Strange behavior on Mac Firefox vs. PC Firefox

[Jason Grunstra]

I have 5 instances of the SwfObject on this site:

http://www.cranium.com/Pop5/video/

Each instance uses the same SWF, just different paramaters to render
different FLV content. The <div> for the Flash content is positioned
absolutely with CSS.

On IE and Firefox on PC everything is fine.

On Firefox and Safari on Mac OSX, the play/stop buttons of the flash
video are not clickable for the first 2 videos, the last 2 work fine,
and the middle one kinda works if you click the very lower half of the
play button! Again, all movies use the same exact SWF.

Anyone have any ideas on why 2.5 of the 5 videos work fine, and the
other 2.5 doesn't!?!