title: load <option> with ajax when open <select>
body: <p>I've a long list of items in a select box (more or less 6000). When I load the PHP page, it takes a while. Because of the fact, that this <code>&lt;select&gt;</code> is  very rarely chanced, I would like to load the <code>&lt;option&gt;</code>´s just in case, that I need them.</p>
  
  <p>I would call the jquery function</p>
  
  <pre><code>$("#select_id").load("code.php").change();
  </code></pre>
  
  <p>But which handler should I use? And how can I shot the user, that this  is loading for 1-2 sec.?</p>