You wouldn't use "this.opener", but "parent" instead, inside your script. For example:
Code:
<form id="testform">
<input type="text" id="mybox" />
</form>
var googlewin=dhtmlwindow.open("googlebox", "iframe", "test.htm", "#1: Test", "width=590px,height=350px,resize=1,scrolling=1,center=1", "recal")
Here's the source for "test.htm":
Code:
<script type="text/javascript">
function postback(thevalue){
parent.document.getElementById("mybox").value=thevalue
}
</script>
<form>
<input type="text" id="test" /> <input type="button" value="Save" onClick="postback(document.getElementById('test').value)" />
</form>
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