Sorry, but it looks like your browser doesn't support either flash or the new HTML5 video using .MP4
If you're using a newer version of FireFox, your browser can play HTML5 video. However, FireFox is an open source project they were unable to provide support for the propritary H.264/ .MP4 video format. You can sitll play these videos by installing flash.
Go here to install it: http://get.adobe.com/flashplayer/