Update Database with Adobe Flash - php

Question

I have trouble to edit data in my database (MySQL).
I try to edit data with Flash (.swf)
Here is the flow of my program
Data -> Edit data with flash -> Data updated
My PHP script
<?php
mysql_pconnect ("localhost", "root", "");
mysql_select_db ("adaptasi");
$qResult = mysql_query ('UPDATE materi
SET isi = "????"
WHERE id = 1');
$rString ="";
echo "edit=".$rString;
?>
and my Actionscript for flash
var result:LoadVars = new LoadVars();
var edit:LoadVars = new LoadVars();
var filepath:String;
result.onLoad = function(success:Boolean) {
if (success) {
text_morfologi.text = result.result;
trace("success");
} else {
trace('error...');
}
};
filepath = "http://localhost/adaptasi/";
result.sendAndLoad(filepath + "morfologi.php", result, "GET");
btnedit.setStyle("fontSize", 22);
btnsave.setStyle("fontSize", 22);
btnedit.visible = true;
btnedit.onRelease = function() {
text_morfologi.type = "input";
btnedit.visible = false;
btnsave.visible = true;
}
btnsave.onRelease = function() {
edit.onLoad = function(success:Boolean){
if (success) {
text_morfologi.text = edit.edit;
trace("success");
} else {
trace('error...');
}
};
filepath = "http://localhost/adaptasi/";
edit.sendAndLoad(filepath + "editmorfologi.php", edit, "GET");
btnedit.visible = true;
btnsave.visible = false;
output.text = "data berhasil diubah...";
}
I can execute that script from flash. But I don't know what should I insert into SET in SQL Update...