call it with a target="_top" command or you can open it in a "_blank" new window, but I think that will confuse your users since the old frame site will still be underneath, better to just replace the window
You can also consider refreshing the main frame into an https call when it reaches the checkout portion, I think that may be what you're looking for
Change the head.tpl to check 2 sections (not sure how you are loading your frames), one for regular and one for https when in main=checkout section
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