I have two divs, one Draggable and one Sortable.
I'd like to keep the values in the sortable unique: I don't want any item that is already in the draggable to be able to be dropped again in the sortable.
I tried to use cancel() but it doesn't seem to be working.
http://jsfiddle.net/6DSaV/2/ shows that I can't even get cancel to do anything.