title: How to get "scrollTop"-value of FB.Canvas.getPageInfo
body: <p>So far I can alert the "scrollTop"-value of "<a href="http://developers.facebook.com/docs/reference/javascript/FB.Canvas.getPageInfo/" rel="nofollow">FB.Canvas.getPageInfo</a>":</p>
  
  <pre><code>FB.Canvas.getPageInfo(
        function(info) {
            alert('scrollTop: ' + info.scrollTop);
        }
    );
  </code></pre>
  
  <p>Now I would like to use this value in one of my functions, but I don't know how.
  The following is not working:</p>
  
  <pre><code>function test() {
      var fbScrollTop = FB.Canvas.getPageInfo();
      alert(fbScrollTop);
  }
  </code></pre>
  
  <p>How can I access the the value?</p>