Resolving flash pathnames in Firefox

I have a webpage that uses an swf file to load media files. Under IE, it works just fine, but in Firefox i first get a dialog box asking if i want to first download an swf, and then it cannot find the appropriate media files to load.

http://www.freedom22.net/uptoparents and then go to Parents Corner and then Overview and then The Nine Deadly Myths. If you click on any of the Myths in IE, the windows media player files load as they should. However, under Firefox, it can't seem to find the problems.

Anyone know how and why Firefox treats path names differently than IE, and what the solution to this problem is?

Thanks