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dhtmlxTree mapping to directory tree : drag-n-drop order issue

I want to represent the dhtmlx tree order on a server as a directory tree. To do this I need to determine where a node has been "dragged from" and "dropped into" ie to redo the order on the server.

I've seen a tree events example using an on drag (tondrag) handler but that only has parameters for the node being dragged (eg dir1/file1) and the node into which the drop occurs (eg if at same level dir1/).

To represent the dhtmlxTree order in the directory tree on the server is of course a problem and the only way I can see to do this is to prepend the names eg
1:file5
2:file3
and remove the prepended number+colon when building the xml for loading into the dhtmlxTree.

So when a drag-n-drop occurs I need to know eg 2:file3 has moved above 1:file5 to give
1:file3
2:file5

And if dragged to a different dir eg move dir1 2:file2 to 2: in dir2
dir1/
1:file1
2:file2
3:file3

dir2/
1:file6
2:file7

then one dir will need to be compacted egand the other expanded ie
dir1/
1:file1
2:file3

dir2/
1:file6
2:file2
3:file7

Open to better suggestions