function getBrowser() {
    var agent = navigator.userAgent;
    return window.opera ? "Opera"
        : /chrom/i.test(agent) ? "Chrome" 
        : /msie/i.test(agent) ? "Internet Explorer" 
        : /applewebkit/i.test(navigator.appVersion) ? "Safari" 
        : /mozilla/i.test(agent) && !/compatible|webkit/i.test(agent) ? "Firefox" 
        : "";
}
 
function getOS() {
    var agent = navigator.userAgent;
    return /windows/i.test(agent) ? "Windows" 
        : /ipad/i.test(agent) ? "iPad" 
        : /iphone/i.test(agent) ? "iPhone" 
        : /android/i.test(agent) ? "Android" 
        : /mac/i.test(agent) ? "Mac OS X" 
        : /x11/i.test(agent) || /linux/i.test(agent) ? "Linux" 
        : "";
}