First version of a is supported browser function dependent on jquery

browser compatibility checker

function isSupportedBrowser() {
  var $browser = jQuery.browser,
      supportedBrowsers = { // Order is important
        'android': 4,
        'chrome' : 34,
        'safari' : 7,
        'mozilla': 37,
        'msie'   : 10
      },
      b, android = getAndroidVersion();

  if (android) {
    $browser.android = true;
    $browser.version = android;
  }

  for (b in supportedBrowsers) {
    if ($browser[b]) {
      return parseInt($browser.version) >= supportedBrowsers[b];
    }
  }

  return false;
}

function getAndroidVersion(ua) {
  ua = (ua || navigator.userAgent).toLowerCase();
  var match = ua.match(/android\s([0-9\.]*)/);
  return match ? match[1] : false;
};