Flash 8 delay help

hi all, new here so ho to every1.
im trying out flash thus the reason im here and will be for a while.

anyway my problem is i have made a banner for my site with a flash movie, i have added the flash movie twice but when viewing in IE sometimes the video and audio seem to be out of sync,
how can i rectify this by maybe having a delay or by removing the sound of 1 of the clips.
im new to this so hopefully some1 here can help.

and this is the banner im on about