[jQuery] Interface Sortables callback

[jQuery] Interface Sortables callback

I'm attempting to use Sortables to sort a list of images but can't get the onchange callback to work.  I am able to drag and drop the elements just fine.  I've also tried other callbacks like onDrag and tried 'onChange' as well. 
Here is my code:
  $('ul').Sortable({
      onchange: function(){alert('test');},
      accept: 'image',
      activeclass: 'activedrop',
      hoverclass: 'hoverdrop',
      helperclass: 'sorthelper',
      tolerance: 'intersect',
      opacity:  .7
  });
And of course the html looks similar to this:
<ul>
<li class="image"><img src="image1"/></li>
<li class="image"><img src="image2"/></li>
</ul>
Any help will be greatly appreciated.
Thanks,
Kevin
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