getSilverlightVersion = function() {
    var SLVersion;

    try {

        try {
            var control = new ActiveXObject('AgControl.AgControl');

            if (control.IsVersionSupported("3.0"))

                SLVersion = 3; else

                if (control.IsVersionSupported("2.0"))
                    SLVersion = 2;
                else if(control.IsVersionSupported("1.0"))
                    SLVersion = 1;
                else if(control.IsVersionSupported("4.0"))
                    SLVersion = 4;
                else
                    SLVersion = 0;

            control = null;
        }

        catch (e) {

            var plugin = navigator.plugins["Silverlight Plug-In"];
            if (plugin) {

                if (plugin.description === "1.0.30226.2")

                    SLVersion = 2; else

                    SLVersion = parseInt(plugin.description[0]);
            }

            else

                SLVersion = 0;
        }

    }

    catch (e) {

        SLVersion = 0;
    }

    return SLVersion;
}