Flash Presentation

I have created a Flash Presentation which runs within a container that calls both the soundtrack (MP3) and adjusts for the screen size. The container works perfectly, as do the invididual movies, but when I run them in the container, the background of the container displays momentarily as the movie loads which messes up the smooth transitions from one movie to the next. Any suggestions on how I prevent the container showing through between movies?

Looking forward to your replies.

Dave