Help with editing XML in Flash 8

[COLOR=black][FONT=Arial]I basically need to load in an XML and then edit it in Flash 8. I have the PHP working; I can write and read XML. The problem is once I have it in Flash I don’t know what to do to edit the thing.[/FONT][/COLOR]
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[COLOR=black][FONT=Arial]I have seen tutorials that allow you to add to the end of an XML file but I need this thing to edit where ever I am in the file.[/FONT][/COLOR]
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[COLOR=black][FONT=Arial]So I need to load in an external XML file, edit that file in Flash, and send it back to the PHP file.[/FONT][/COLOR]
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[COLOR=black][FONT=Arial]Any ideas?[/FONT][/COLOR]
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[COLOR=black][FONT=Arial]Thank you.[/FONT][/COLOR]