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If you rely on the browser, I think you are out of luck....
"The address of the page (if any) which referred the user agent to the current page. This is set by the user agent. Not all user agents will set this, and some provide the ability to modify HTTP_REFERER as a feature. In short, it cannot really be trusted."
Thus, I think the only 100% method would be to pass it as a parameter...it does mean the page being opened would have to accept and read that parameter though.
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Skype variuscr - Email varius AT gmail
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