How to Detect Lync 2013 web plugin (LWA) installed with javascript?

hello everyone,

we want make web page check if user have web plugin (lwa) join conferences... before automatically signing him. (this why want check first)

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if not understand me try spanish :)

right have this... not working "automation server can't create object" message. i'm expecting message if client don't have the plugin but always... if machine have plugin installed.

pluginloader.prototype._createplugin = function() {     if (this._clsname)     {         try         {             if (this._isie)             {                 this._plugininstance.object = new activexobject("microsoft.lwaplugin15.7.inproccomponentfx");             }             else             {                 this._plugininstance.object = null;             }         }         catch( ex )         {             // error creating activex object.             //alert(ex.tostring());         } .... }

and client have installed lwaplugin... :(

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if not understand me try spanish :)

Lync Server  ,  Unified Communications  >  Microsoft Lync Client Development