title: Need to hook into a javascript function call, any way to do this?
body: <p>I'm trying to hook into a function that loads Facebook's news feed:</p>
  
  <pre><code>UIIntentionalStream.instance &amp;&amp; UIIntentionalStream.instance.loadOlderPosts();
  </code></pre>
  
  <p>on Facebook.com.</p>
  
  <p>Is there a way for me to do this with my own JavaScript? Basically, I need to have some sort of callback - when that function is called, I'd like my own function to be called.</p>