[xml] backend to update xml

[alapimba]

hello
i'm making one site in flash and it uses data from a xml
everything is working perfect, but now i need to find one way to update the xml..i mean.. the xml has to be update by a person that the knowledge in computer is basicly 0, so i wanted to make a form or something where the xml data appear and than can be edited and saved again..
i did a lots of searchs but i don't know how to do it or in some cases i can't put the tutorials working and in other cases it needs changes in the php instalation and has the files will be on a server that i can't change configuration that's not an option.
i'm open to use asp php... anything! i just need to make it work..
please some one help because i'm sure that's not hard to make this **** work

my xml is basicly this:

<?xml version="1.0"?>
<xpto>
<user>
<number>23</number>
<name>john</name>
</user>
<user>
<number>32</number>
<name>mike</name>
</user>
<user>
<number>67</number>
<name>bob</name>
</user>
</xpto>

please help me creting a backend for this simple xml.
thanks in advance

[Krilnon]

So couldn't you have the XML load things from elsewhere?

[alapimba]

er.. i can make flash display the data from the xml.. what i can't is load the xml to somewhere (don't know where) to then edit..
i thought php was the easy mode to make this but it seems that it's not so easy to load xml data to php to then edit in a form or something...