CJuiDraggable and ajax


I am trying to use CJuiDraggable with ajax.

I am using the last example : "Stack Draggable".

The code is : in this link Draggable

In my database I have column called "Row_number".

I need to have an event listener : "start dragging" and "stop dragging", Then I modify the "Row_number" value in the database using ajax.

Please help. :)