fbconnect authentication window don't closed

Question

Hi, I have created an application which uses fbconnect. The application uses new facebook graph api(javascript sdk). The problem is do not close the authentication popup window after authenticating. It shows a blank page. My code is

<script type="text/javascript">
  window.fbAsyncInit = function() {
  FB.init({appId: mixin.fb_connect_apiId, status: true, cookie: true, xfbml: true});
  /*FB.Event.subscribe('auth.login', function(response) {
      // do something with response
   next();
  });*/
  };
  (function() {
   var e = document.createElement('script');
   e.type = 'text/javascript';
   e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js';
   e.async = true;
   document.getElementById('fb-root').appendChild(e);
  }());
  $('#fb_connect').bind('click',  function() {
   FB.login(function(response){
    if(response.session){
     alert("fbconnected!!");
     //next();
    }else{
     alert("couldn't fbconnect!!");
    }
   },{perms:'offline_access,publish_stream,rsvp_event'});
  });

</script>