window.fbAsyncInit = function() {
    FB.init({
      appId   : '<?php echo $facebook->getAppId(); ?>',
      session : '<?php echo json_encode($session); ?>', // don't refetch the session when PHP already has it
      status  : true, // check login status
      cookie  : true, // enable cookies to allow the server to access the session
      xfbml   : true // parse XFBML
    });

    // whenever the user logs in, we refresh the page
    FB.Event.subscribe('auth.login', function() {
      window.location.reload();
    });
  };

  (function() {
    var e = document.createElement('script');
    e.src = document.location.protocol + '//connect.facebook.net/it_IT/all.js';
    e.async = true;
    document.getElementById('fb-root').appendChild(e);
  }());