Any chance that you could translate that into
vb script?
I tried myself by writting,
Code:
<script runat="server">
Public Sub GhettoField(ByVal sender As Object)
Dim myField As Object = Forms(0).elements("MyHiddenField")
myField.value = sender.options(sender.selectedindex).value
End Sub
</script>
It does not recognise forms. It says "Name Forms is not declared."