is_mobile.js

// From http://stackoverflow.com/questions/11381673/javascript-solution-to-detect-mobile-browser#answer-13819253

var isMobile = {
    Android: navigator.userAgent.match(/Android/i),
    BlackBerry: navigator.userAgent.match(/BlackBerry/i),
    iOS: navigator.userAgent.match(/iPhone|iPad|iPod/i),
    Opera: navigator.userAgent.match(/Opera Mini/i),
    Windows: navigator.userAgent.match(/IEMobile/i) || navigator.userAgent.match(/WPDesktop/i)
};

isMobile.any = isMobile.Android || isMobile.BlackBerry || isMobile.iOS || isMobile.Opera || isMobile.Windows;