Hi
I would honestly believe that the easiest method for you to accomplish your end goal, which I believe is to have the submitters end up back at your main page, would be as follows.
Have the separate page open up normally, and when they click submit have them redirected right back to the main page.
An alternative idea would be to have the following javascript on both the Form Page and the resulting redirected page.
Code Sample:
<form><input type=button value="Close Window" onClick="javascript:window.close();"></form>
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This would allow your users to simply press a button to close the form submission page and/or the resulting redirection page.
Don't know that this is exactly what your looking for but it may help lead there
Enjoy,
Bob