var browser = "";
if(navigator.userAgent.indexOf("Firefox")!=-1)
        browser = "firefox";
else if(navigator.userAgent.indexOf("Safari")!=-1)
        browser = "safari";
else if(navigator.appVersion.indexOf("MSIE")!=-1)
        browser = "ie";

var operatingSystem = "";
if(navigator.userAgent.indexOf("Macintosh")!=-1 || navigator.appVersion.indexOf("Macintosh")!=-1)
        operatingSystem = "mac";
else if(navigator.userAgent.indexOf("Macintosh")!=-1 || navigator.appVersion.indexOf("Macintosh")!=-1)
        operatingSystem = "win";