S.O.S)))) Editing a XML from Flash))))

I am trying to edit a XML from Flash through a php.
I have been developing it from a tutorial that I found in KIRUPA.
The problem is that I can edit my data, but only the data of the first entry.
Anybody knows how could I edit the rest of the entries?
I attached a file zip that contains the php, the xml and the fla in case that someone could help me.
Greetings to everybody,
Ana