Why can't you just have the popup form have it's action set to the url of the parent..then put a catcher in the parent that catches the ....oh...hang on let me show you..

<FORM METHOD=POST ACTION="url_to_cgi_script_that_CREATES_FRAME_That_HO
+LDS_PARENT.cgi?action_PARAM">
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TexasTess
"Great Spirits Often Encounter Violent Opposition From Mediocre Minds" --Albert Einstein