javascript for ie vs javascript for firefox

I have clientside javascript returning a user selection from a popup
window to the parent window. works fine in ie but not in firefox.
Firefox debugger says : window.opener.Form1 has no properties

code is :
<script language="javascript">
function btnOK_Click(){
window.opener.Form1.<%=request.querystring("name")
%>.value=window.Form1.lstMonth(window.Form1.lstMonth.selectedIndex).text
+ " - " + window.Form1.lstYear.value;
window.opener.Form1.<%=request.querystring("id")
%>.value=window.Form1.lstMonth.value + "f1f" +
window.Form1.lstYear.value
window.close();
}

</script>

It's complaining about the first line of the code...Any clues ?
Cheers
Chris

.

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