title: How to use jQuery .subscribe()?
body: <p>I've been trying to use <code>$.subscribe</code> but it doesn't seem to work. I downloaded a WAR project where it does work but when I use this function in my project it doesn't work. Do I have to download an extra plugin?</p>
  
  <p>Because I couldn't find info about these functions in the jQuery website either, I just found the new <code>$.Callbacks()</code> function. The reason I need to use <code>$.subscribe</code> is so I can use something like <em>onBeforeTopic</em>. </p>
  
  <p>Thanks in advance.</p>