anchor.diff:    the FB.login() function when clicked.
   -->
   
  -<fb:login-button scope="public_profile,email" onlogin="login();">
  +<fb:login-button scope="public_profile,email" onlogin="checkLoginState();">
   </fb:login-button>
   
   <div id="status">
  
positive.code:     statusChangeCallback(response);
    });
  
  
  
    // Load the SDK asynchronously
    (function(d, s, id) {
  
negative.code:       document.getElementById('status').innerHTML =
          'Thanks for logging in, ' + response.name + '!';
      });
    }
  </script>
  
  <!--
  