It is a QuickTime video, using a QT Plug-in.
If you have a PC, right click on the screen area and choose 'About QuickTime Plug-in...' My version is 7.1.3. You may need an update, or the plug-in to your browser may not be working properly.
To update, Right-click again and choose 'Plug-in Settings'. There is an update tab in the Preferences dialog box.
If you have a Mac, well someone else will have to chime in!