script.aculo.us: Two floating sortables with containment and dropOnEmpty
This is the first list
 
   - Item 1 from first list.
- Item 2 from first list.
- Item 3 from first list.
 
 
 And now the second list
 
   - 
     DRAG HERE Item 1 from second list.
   
- 
     DRAG HERE Item 2 from second list.
   
- 
     DRAG HERE Item 3 from second list.