Help: transparent background for flash anim on Firefox

I am able to get my flash animation to show a transparent background (thanks to forum members advice) on Internet Explore but it doesn’t do the same on firefox (it shows white background). I am using dreamweaver to build my site and my firefox browser version is

I created a website and was excited about putting it up to the host server when I discovered this problem. :puzzle: Any help would be appreciated. Thanks,