swishmax draw and pass variable

Hi,
I am creating a swf with swishmax1 (yah, i know 2 is out).
Let me preface this with I really don't do much in swish besides some animations every once and a while for sites.

But this project is a drawing that gets some varibles from the:
<param name="movie" value="signdoc.swf?itema=test&itemb=test">

Which works great I then allow the visitor to draw something.
Here is the script on the scene:
onLoad () {
itema_text = itema;
itemb_.text = itemb;
_root.lineStyle(2,0x330099,80);
// variables
draw=false;
// keeps track of mousedown status
data='';
// variable to hold drawing data
// note - place a textfield on stage with variable name "data"
}
on (press) {
draw = true;
startX = _root._xmouse;
startY = _root._ymouse;
_root.moveTo(startX,startY);
}
on (release) {
draw = false;
}
onEnterFrame(includingFirstFrame) {
if (draw) {
newX = _root._xmouse;
newY = _root._ymouse;
if ((newX != startX) or (newY != startY)) {
_root.lineTo(newX,newY);
_root.data_+=startX+','+startY+' '+_xmouse+','+_ymouse+'~';
startX = newX;
startY = newY;
}
}
}

As you can see it passes the data to the field "data". and that works great too.

The problem is on the submit button:
on (press) {
data = data_.text;
itema = itema.text;
itemb = itemb.text;
getURL ("form.cgi", "_parent", "POST");

}

The form.cgi is not receiving the data variable.
It only receives itema and itemb.
Any ideas?

Thanks,

Stan