title: Javascript disable/enable event and $addhandler
body: <p>I am fairly new to JScript and I am looking for a way to subscribe to the event when a textbox is disabled or enabled.  I am creating a AJAX Extender Control and I am subscribing through the JScript:</p>
  
  <pre><code>$addhandler(textbox, 'EventName', Function);
  </code></pre>
  
  <p>I have it working for "click", "focus" and "blur", but I'd like to get enable disable working.
  Is there an exhaustive list of events that can be hooked into out there? I've tried googling everything I know.</p>