title: Force prettyPhoto to refresh when content changes dynamically
body: <p>i have <a href="http://www.appelsiini.net/projects/chained" rel="nofollow">chained selects</a> that load images thumbnails linked with prettyphoto.</p>
  
  <p>Obviously prettyphoto during initialization can see only the first select of the chain, so i should reinitialize it every time selects load the links!
  i tried to call those scripts onchange trigger:</p>
  
  <pre><code>$("a[rel^='prettyPhoto']").prettyPhoto();
  </code></pre>
  
  <p>or</p>
  
  <pre><code>prettyPhoto.initialize();   
  </code></pre>
  
  <p>but no one of them work.
  The first gives no hints, the second returns me the error:  prettyPhoto is not defined!</p>
  
  <p>All other images not loaded dinamically works fine, please help!</p>