title: Combining revert with jQuery draggable/droppable
body: <p>I'm using the drag and drop plugin with jQuery UI. I'd like to make it so that the draggable container can only be dragged and dropped on the container. In the demonstration:</p>
  
  <p><a href="http://jqueryui.com/demos/droppable/#revert" rel="nofollow">http://jqueryui.com/demos/droppable/#revert</a></p>
  
  <p>It has 2 options. One is to revert when it drags to the container, the second is to revert when it isn't dragged to the container. </p>
  
  <p>Is there a way to combine these two? I don't want to be able to drag the #draggable container anywhere where there isn't a #droppable container.</p>