if (!window.Silverlight)
{
    window.Silverlight = { };
}

Silverlight.supportedUserAgent = function(version, userAgent) {
    try {
        var ua = null;

        if (userAgent) {
            ua = userAgent;
        }
        else {
            ua = window.navigator.userAgent;
        }

        var slua = { OS: 'Unsupported', Browser: 'Unsupported' };

        //Silverlight does not support pre-Windows NT platforms
        if (ua.indexOf('Windows NT') >= 0 || ua.indexOf('Mozilla/4.0 (compatible; MSIE 6.0)') >= 0) {
            slua.OS = 'Windows';
        }
        else if (ua.indexOf('PPC Mac OS X') >= 0) {
            slua.OS = 'MacPPC';
        }
        else if (ua.indexOf('Intel Mac OS X') >= 0) {
            slua.OS = 'MacIntel';
        }
        else if (ua.indexOf('Linux') >= 0) {
            slua.OS = 'Linux';
        }

        if (slua.OS != 'Unsupported') {
            if (ua.indexOf('MSIE') >= 0) {
                if (navigator.userAgent.indexOf('Win64') == -1) {
                    if (parseInt(ua.split('MSIE')[1]) >= 6) {
                        slua.Browser = 'MSIE';
                    }
                }
            }
            else if (ua.indexOf('Firefox') >= 0) {
                var versionArr = ua.split('Firefox/')[1].split('.');
                var major = parseInt(versionArr[0]);
                if (major >= 2) {
                    slua.Browser = 'Firefox';
                }
                else {
                    var minor = parseInt(versionArr[1]);
                    if ((major == 1) && (minor >= 5)) {
                        slua.Browser = 'Firefox';
                    }
                }
            }

            else if (ua.indexOf('Safari') >= 0) {
                slua.Browser = 'Safari';
            }
        }

        //detect all unsupported platform combinations (IE on Mac, Safari on Win)
        var supUA = (!(slua.OS == 'Unsupported' ||                             //Unsupported OS
                            slua.Browser == 'Unsupported' ||                        //Unsupported Browser
                            (slua.OS == 'Windows' && slua.Browser == 'Safari') ||   //Safari is not supported on Windows
                            (slua.OS.indexOf('Mac') >= 0 && slua.Browser == 'MSIE')   //IE is not supported on Mac
                                ));

        if (version == '2.0') {
            //add PPC and Linux to unsupported list
            return ((supUA && (slua.OS != 'MacPPC' && slua.OS != 'Linux')));
        }
        else if (version == '1.0') {
            //add win2k to unsupported list
            return (supUA && (ua.indexOf('Windows NT 5.0') < 0));
        }
        else {
            return (supUA);
        }
    }
    catch (e) {
        return false;
    }
}