I uploaded a short video to my website recently and although it plays fine in IE, Firefrox complains about a missing plugin. I ask it to look, but it fails to find anything to play this video. It's annoying to see the bar at the top of the page every time I view the index page now, and I can't believe Firefox is incapable of playing an avi file.

I've installed Quick Time and QT Alternative and .mov files and .wav files are OK. Any suggestions? Many thanks. I'm using Firefox version 2.0.0.1 by the way, on XP pro.