how can i save panal places after drag and drop

i can use atlas's drag and drop options but i wanna save my panel's positions after drag and drop.

for example i have a 2 area . Left area and right area. and i have 3 draggableListItem.

after i changer draggableListItems's place i wanna write that changesin to xml file or somewhere whish is i can use later.?

http://forums.asp.net/thread/1286119.aspx