[jQuery] Interface Sortables onchange property

[jQuery] Interface Sortables onchange property

Hi.  I'm trying to fire off an alert (testing) during a sortables onchange event.  Here's my code:
var personalizeHPTabs = function() {
    alert('hi... I'm here');
};
var triggerHPTabsPersonalization = function() {
    $('ul.hptabs-sortable').Sortable( {
      accept : 'hptab-sort-item',
      helperclass : 'sorthelper',
      opacity: 0.8,
      fx: 200,
      tolerance: 'intersect',
      axis: 'vertically',
      onchange: personalizeHPTabs
   })
}
The weird thing is it never fires for the onchange property... I did get it to fire on the onStop, but I only want it to trigger when a change actually occurs.  Any ideas?
Rich
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