Standard JavaScript for this
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I'm working on some 15 year old code and there is a line that only seems to actually get set and be usuable in IE. I can't change that line because there actually more of them and referenced in other asp pages, I know, a nightmare.
The code:


parent.frmParent.id_item.value = '<%=Request("id_item")%>'


I've tried:

var parent.document.getElementById("id_item").Value
var parent.document.getElementById("frmParent")("id_item").Value

Am I close? It must exist in the DOM.