detect plugin

I am writing a HTML5 <video> tag support into contemporary browsers via 
javascript:
http://metavid.ucsc.edu/blog/2007/06/07/html5-video-the-future-is-now/

one playback method is the mplayer plugin. Right now its very limited in 
its support. To detect mozilla based plugins I have been using the 
navigator.mimeTypes but mplayer does not seem to register anything 
mplayer specific: ie vlc plugin registers application/x-vlc-plugin, and 
oggplay plugin application/liboggplay ...

Is there anyway to reliably detect if mplayer plugin is installed.. that 
way I could extend the greater html5 support (the javascript/css 
playhead full screen etc) to the associative mplayer javascript hooks: 
http://mplayerplug-in.cvs.sourceforge.net/mplayerplug-in/mplayerplug-in/DOCS/tech/javascript.txt?view=markup 


A work around is:  if windows media is supported, & on linux platform 
... you probably have mplayer installed... but I think it would be ideal 
to register a mplayer specific mime type for easy detection without 
conflicts with vlc.

--michael

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