$_GET of a parent frame?

Hi all, I'm working on an page with frames. I would like to read an url variable from the 'main' page, in one of the sub-pages. E.g. url (in the browser) www.test.com?log=NO One of the frames is an php script (say: content.php), where the log must be read. However, the content.php script is updated from anonther (navigation frame). So my question: is it possible to read the log variable from the parent frame, using the $_Get statement? If not (would not supprise me) does anyone has a sugestion? Regards, Gerrit