If you have already installed QuickTime Player on your computer, and think you have the Plug In, check the folder for your browser application. Inside this folder will be a folder called "Plugins". If you do not see a QuickTime Plugin in this folder, but you do have QuickTime on your computer, you will need to go to the Quicktime application folder, make a copy of the Plugin that is there and put it in the browser application plugins folder.
IMPORTANT NOTE: Be careful during installation of the Quicktime Plug-In that you DO NOT set it to be your DEFAULT audio or media player.
This way Quicktime will play the .mov files posted above and will not mess with your other computer settings.