function flipToUA(ua, url) {
  var current = new Date();
  var cookie;
  if (ua == "mobile") {
    current.setDate(current.getDate() - 1);
  }
  else {
    current.setDate(current.getDate() + 3);
  }
  cookie = 'skip_mobile=1; expires=' + current.toGMTString() + '; path=/';
  document.cookie = cookie;
  window.location = url;
}