Sortable : The scroll through an iframe don't work

Sortable : The scroll through an iframe don't work


I have a problem with the scroll when sortable items are in an
iframe : the target window is the iframe element itself, not the main
window
I don't know if it's possible to change easily the target window or to
consider the main window.
You can check at this address : http://www.i-domail.com/demo.html
Thank's