can't find mplayer2 plug-in!!! help!

I am trying to listen to some radio stations online on my MBP and watch some videos but I can't due to the following problem:

The page “LIVE24.gr: Best 92.6” has content of MIME type “application/x-mplayer2”, but you don’t have a plug-in installed for this MIME type. A plug-in should be available on this page:

http://www.microsoft.com/Windows/Downloads/Contents/Products/MediaPlayer/

I go on Microsoft's page but it says "sorry...page cannot be found". i have been trying to find and download the plug-in but nothing!! please help!

thanks a lot in advance...