Silverlight.detectUserAgent = function() {
    Silverlight.ua = null;
    var a = window.navigator.userAgent;
    Silverlight.ua = {
        OS: "Unsupported",
        Browser: "Unsupported"
    };
    if (a.indexOf("Windows NT") >= 0) Silverlight.ua.OS = "Windows";
    else if (a.indexOf("PPC Mac OS X") >= 0) Silverlight.ua.OS = "MacPPC";
    else if (a.indexOf("Intel Mac OS X") >= 0) Silverlight.ua.OS = "MacIntel";
    if (Silverlight.ua.OS != "Unsupported") if (a.indexOf("MSIE") >= 0) {
        if (navigator.userAgent.indexOf("Win64") == -1) if (parseInt(a.split("MSIE")[1]) >= 6) Silverlight.ua.Browser = "MSIE"
    } else if (a.indexOf("Firefox") >= 0) {
        var b = a.split("Firefox/")[1].split("."),
        c = parseInt(b[0]);
        if (c >= 2) Silverlight.ua.Browser = "Firefox";
        else {
            var d = parseInt(b[1]);
            if (c == 1 && d >= 5) Silverlight.ua.Browser = "Firefox"
        }
    } else if (a.indexOf("Safari") >= 0) Silverlight.ua.Browser = "Safari"
};