(function($){
    $.browserTest = function(a, z){
        var u = 'unknown', x = 'X', m = function(r, h){
            for (var i = 0; i < h.length; i = i + 1) {
                r = r.replace(h[i][0], h[i][1]);
            }
            return r;
        }, c = function(i, a, b, c){
            var r = {
                name: m((a.exec(i) || [u, u])[1], b)
            };
            r[r.name] = true;
            r.version = (c.exec(i) || [x, x, x, x])[3];
            if (r.name.match(/safari/) && r.version > 400) {
                r.version = '2.0';
            }
            if (r.name === 'presto') {
                r.version = ($.browser.version > 9.27) ? 'futhark' : 'linear_b';
            }
            r.versionNumber = parseFloat(r.version, 10) || 0;
            r.versionX = (r.version !== x) ? (r.version + '').substr(0, 1) : x;
            r.className = r.name + r.versionX;
            return r;
        };
        a = (a.match(/Opera|Navigator|Minefield|KHTML|Chrome/) ? m(a, [[/(Firefox|MSIE|KHTML,\slike\sGecko|Konqueror)/, ''], ['Chrome Safari', 'Chrome'], ['KHTML', 'Konqueror'], ['Minefield', 'Firefox'], ['Navigator', 'Netscape']]) : a).toLowerCase();
        $.browser = $.extend((!z) ? $.browser : {}, c(a, /(camino|chrome|firefox|netscape|konqueror|lynx|msie|opera|safari)/, [], /(camino|chrome|firefox|netscape|netscape6|opera|version|konqueror|lynx|msie|safari)(\/|\s)([a-z0-9\.\+]*?)(\;|dev|rel|\s|$)/));
        $.layout = c(a, /(gecko|konqueror|msie|opera|webkit)/, [['konqueror', 'khtml'], ['msie', 'trident'], ['opera', 'presto']], /(applewebkit|rv|konqueror|msie)(\:|\/|\s)([a-z0-9\.]*?)(\;|\)|\s)/);
        $.os = {
            name: (/(win|mac|linux|sunos|solaris|iphone)/.exec(navigator.platform.toLowerCase()) || [u])[0].replace('sunos', 'solaris')
        };
        if (!z) {
            $('html').addClass([$.os.name, $.browser.name, $.browser.className, $.layout.name, $.layout.className].join(' '));
        }
    };
    $.browserTest(navigator.userAgent);
})(jQuery);