Detect browser

gistfile1.txt

    var detectBrowser = function(){
        var ua = navigator.userAgent, tem,
        M = ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [];
        if (/trident/i.test(M[1])) {
            tem=  /\brv[ :]+(\d+)/g.exec(ua) || [];
            return 'IE ' + (tem[1] || '');
        }
        if (M[1] === 'Chrome') {
            tem = ua.match(/\bOPR\/(\d+)/);
            if (tem != null) return 'Opera ' + tem[1];
        }
        M = M[2] ? [M[1], M[2]]: [navigator.appName, navigator.appVersion, '-?'];
        if ((tem = ua.match(/version\/(\d+)/i)) != null) M.splice(1, 1, tem[1]);
        return M.join(' ');
    };

    var detectedBrowser = detectBrowser();