Can't sort LI items that has also draggable/droppable event listener

Can't sort LI items that has also draggable/droppable event listener


Hi, I'm tryng to organize a menu using draggable/droppable/sortable:
I've put an example here:
http://lab.gianiaz.com/jquery/sortable-droppable/unsolved.html
What I want to do is to move LI nodes between the four list, and be
able to sort LI nodes inside every UL.
If I comment the code about the draggable/sortable the sort
functionality works.
Any help appreciated.
Bye :-)