function IsPlugin(myMime)
{
   var result = 0;
   var nPlugins = navigator.plugins.length;
   for (var i = 0; i < nPlugins && !result; i++ )
   {
      var myPlugin = navigator.plugins[i];
      var myType = myPlugin[myMime];
      result = myType && myType.enabledPlugin == myPlugin;
   }
   return result;
}