my first post here

I am using jQuery with interface.eyecon to order elements and save the order by ajax request to a database mysql

works perfectly but just using simple <div> and all on one level
what I would like to do now is to order also in subcategories (mothers, daughters etc...) all by drag and drop

this is what I have found and that I like how it works
http :// interface.eyecon.ro /demos/drag_drop_tree.html

but I am not able to serialize the order, even just with an alert

Code:
function serialize(s) {
  serial = $.SortSerialize(s);
  alert(serial.hash);
}