[Seaside] Scriptacolous: How can I know the position of a dropped element ?

[Martin Rubi]

Hello everybody.
I have a container where the user can drag & drop div elements. When the 
user drops an element, I'd like to get the new element position (relative to 
the container), and store it in somewhere in the model.
I tried to figure out how to get the element new position, but I couldn't. 
Any clues ?


Thanks in advance
martin