Which bit isn't working?
The opener method will work in any browser, but you don't seem to be using it.
How you create the popup is actually not that important when it comes to targeting the main window from the popup.
Your current method of targeting the main window from the popup simply revolves around referring to the main window as 'main'.
I'm guessing that you're main window uses frames and 'main' is actually the name of a frame within that frameset?
Is that correct?
It's no longer clear to me what you are trying to achieve and how you currently have things set out.
Do you have an online example where I/we can see what's going on first hand?