title: ajax "loading" icon with UpdatePanel postbacks
body: <p>I have a form that is being dynamically built depending on user selection using Ajax (built in .NET Ajax with UpdatePanel).</p>
  
  <p>how can I insert a "standard" ajax loading icon (maybe have it attached to the mouse pointer) while the postback is happening then remove it when the post back is finished?</p>
  
  <p>I do have the AjaxToolKit installed if that helps.</p>