browsers support

top.js

browser = function ($) {
    'use strict';
    var data = [
        { str: navigator.userAgent, sub: 'Chrome', ver: 'Chrome', name: 'chrome' },
        { str: navigator.vendor, sub: 'Apple', ver: 'Version', name: 'safari' },
        { prop: window.opera, ver: 'Opera', name: 'opera' },
        { str: navigator.userAgent, sub: 'Firefox', ver: 'Firefox', name: 'firefox' },
        { str: navigator.userAgent, sub: 'MSIE', ver: 'MSIE', name: 'ie' },
        { str: navigator.userAgent, sub: 'Trident/7.0', ver: 'rv', name: 'ie' }
    ];
    var v = function (s, n) {
        var i = s.indexOf(data[n].ver);
        return (i !== -1) ? parseFloat(s.substring(i + data[n].ver.length + 1)) : 0;
    };
    var result = { name: 'unknown', version: 0 };
    var html = $('html');
    for (var n = 0; n < data.length; n++) {
        if (!result[data[n].name]) {
            result[data[n].name] = false;
        }
        if ((data[n].str && (data[n].str.indexOf(data[n].sub) !== -1)) || data[n].prop) {
            result.name = data[n].name;
            result[result.name] = true;
            result.version = v(navigator.userAgent, n) || v(navigator.appVersion, n);
            html.addClass(result.name + ' ' + result.name + parseInt(result.version, 10));
        }
    }
    return result;
} (jQuery);