function xbDetectBrowser() {
    var oldOnError = window.onerror;
    var element = null;

    window.onerror = null;

    // work around bug in xpcdom Mozilla 0.9.1
    window.saveNavigator = window.navigator;

    navigator.OS = '';
    navigator.version = parseFloat(navigator.appVersion);
    navigator.org = '';
    navigator.family = '';

    var platform;
    if (typeof (window.navigator.platform) != 'undefined') {
        platform = window.navigator.platform.toLowerCase();
        if (platform.indexOf('win') != -1)
            navigator.OS = 'win';
        else if (platform.indexOf('mac') != -1)
            navigator.OS = 'mac';
        else if (platform.indexOf('unix') != -1 || platform.indexOf('linux') != -1 || platform.indexOf('sun') != -1)
            navigator.OS = 'nix';
    }

    var i = 0;
    var ua = window.navigator.userAgent.toLowerCase();

    if (ua.indexOf('opera') != -1) {
        i = ua.indexOf('opera');
        navigator.family = 'opera';
        navigator.org = 'opera';
        navigator.version = parseFloat('0' + ua.substr(i + 6), 10);
    }
    else if ((i = ua.indexOf('msie')) != -1) {
        navigator.org = 'microsoft';
        navigator.version = parseFloat('0' + ua.substr(i + 5), 10);

        if (navigator.version < 4)
            navigator.family = 'ie3';
        else
            navigator.family = 'ie4'
    }
    else if (ua.indexOf('gecko') != -1) {
        navigator.family = 'gecko';
        var rvStart = ua.indexOf('rv:');
        var rvEnd = ua.indexOf(')', rvStart);
        var rv = ua.substring(rvStart + 3, rvEnd);
        var rvParts = rv.split('.');
        var rvValue = 0;
        var exp = 1;

        for (var i = 0; i < rvParts.length; i++) {
            var val = parseInt(rvParts[i]);
            rvValue += val / exp;
            exp *= 100;
        }
        navigator.version = rvValue;

        if (ua.indexOf('netscape') != -1)
            navigator.org = 'netscape';
        else if (ua.indexOf('compuserve') != -1)
            navigator.org = 'compuserve';
        else
            navigator.org = 'mozilla';
    }
    else if ((ua.indexOf('mozilla') != -1) && (ua.indexOf('spoofer') == -1) && (ua.indexOf('compatible') == -1) && (ua.indexOf('opera') == -1) && (ua.indexOf('webtv') == -1) && (ua.indexOf('hotjava') == -1)) {
        var is_major = parseFloat(navigator.appVersion);

        if (is_major < 4)
            navigator.version = is_major;
        else {
            i = ua.lastIndexOf('/')
            navigator.version = parseFloat('0' + ua.substr(i + 1), 10);
        }
        navigator.org = 'netscape';
        navigator.family = 'nn' + parseInt(navigator.appVersion);
    }
    else if ((i = ua.indexOf('aol')) != -1) {
        // aol
        navigator.family = 'aol';
        navigator.org = 'aol';
        navigator.version = parseFloat('0' + ua.substr(i + 4), 10);
    }
    else if ((i = ua.indexOf('hotjava')) != -1) {
        // hotjava
        navigator.family = 'hotjava';
        navigator.org = 'sun';
        navigator.version = parseFloat(navigator.appVersion);
    }

    window.onerror = oldOnError;
}

xbDetectBrowser();