XUI question--how to pass strings collected from XML back to ACL script?

Hello everyone,

Here is my acl script:

$doc=doc_open("C:\\Temp\\test.xml", 1);

$win=window_create('xui', 0x10, $doc, '300x800-1-1');

window_show($win,1);

Here is my XML file--test.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!--Arbortext, Inc., 1988-2011, v.4002-->
<!DOCTYPE window PUBLIC "-//Arbortext//DTD XUI XML 1.1//EN"
"xui.dtd">
<window backgroundcolor="grey" focus="Cancel" height="200" modal="false"
orient="vertical" pack="start" title="Country Selection" width="500">
<box orient="vertical">
<radiogroup id="test1" label="Filtering Mode" orient="horizontal" pack="start"
resize="natural">
<radio id="Countrygroup1" label="Country group 1"></radio>
<radio id="Countrygroup2" label="Country group 2"></radio>
<radio id="Countrygroup3" label="Country group 3"></radio>
</radiogroup>
</box>
<spacer height="5"/>

<groupbox label="Select Country Code(s):" pack="end" resize="width">
<box id="test2" orient="horizontal">
<grid columns="3" resize="width">
<checkbox id="CountryA" label="Country A"></checkbox>
<checkbox id="CountryB" label="Country B"></checkbox>
<checkbox id="CountryC" label="Country C"></checkbox>
<checkbox id="CountryD" label="Country D"></checkbox>
<checkbox id="CountryE" label="Country E"></checkbox>
<checkbox id="CountryF" label="Country F"></checkbox>
</grid>
</box>
</groupbox>
<spacer height="10" resize="none"/>
<box pack="end">
<button label="OK" type="accept">
<script type="application/x-javascript" ev:event="domactivate">
var document = Application.event.target.ownerDocument;
var radiobox = document.getElementById("test1");
var checkbox = document.getElementById("test2");
var list1 = radiobox.getElementsByAttribute("checked", "true", 1);
var list2 = checkbox.getElementsByAttribute("checked", "true", 1);
for (var i = 0; i < list1.length; i++) {
   Application.alert(list1.item(i).getAttribute("id"));
}
for (var i = 0; i < list2.length; i++) {
   Application.alert(list2.item(i).getAttribute("id"));
};
var dialog = Application.event.view.window;
dialog.close();
</script>
</button>
<button id="Cancel" label="Cancel" type="cancel"></button>
</box>
</window>

How could I pass both list1 and list2 strings in my XML back to my acl script for further processing?

Your help will be greatly appreciated.

Sincerely,

Jing