firefox and mplayer issue

[Gerhard Magnus]

I can't get mplayer to work with firefox anymore. I'm using firefox
2.0.0.14. Running yum install mplayerplug-in gives 

Package gecko-mediaplayer - 0.6.1-1.lvn8.i386 already installed and
latest version
Nothing to do

but the plugin directory only contains this:

root at PuteB Sat Apr 26 08:35:38
[336] /usr/lib/firefox-2.0.0.14/plugins $ ls
libflashplayer.so  libnullplugin.so  libunixprintplugin.so

What else do I need to copy there? 
Thanks for the help!  --Jerry