var isFlash,isMPlayer,isQuickT,isRPlayer;
isFlash = navigator.mimeTypes &&
navigator.mimeTypes["application/x-shockwave-flash"] &&
navigator.mimeTypes["application/x-shockwave-flash"].enabledPlugin;
isMPlayer = navigator.mimeTypes &&
navigator.mimeTypes["application/x-mediaplayer"] &&
navigator.mimeTypes["application/x-mediaplayer"].enabledPlugin;
isQuickT = navigator.mimeTypes &&
navigator.mimeTypes["video/quicktime"] &&
navigator.mimeTypes["video/quicktime"].enabledPlugin;
isRPlayer = navigator.mimeTypes &&
navigator.mimeTypes["application/x-realplayer"] &&
navigator.mimeTypes["application/x-realplayer"].enabledPlugin; //"audio/x-pn-realaudio-plugin"