getenv ... i think

Hi all, http://steven.macintyre.name/myscript.phps is my code as it stands The purpose of the code is as follows; Its for a non-profit company - wanting to offer "support" banners for users who pay for them right ... as in donation. They want to be able to restrict those banners to a certain period "the bought period" and I want to restrict them to only access the banners from the specified URL when they signed up. IE ... if you signed up with http://www.yourlovelydomain.com i want to be able to limit the display of these banners depending on the hash and somehow - checking the domain its coming from Any ideas - am i on the right track ? If i take OUT the getenv if then, it works ... so i know that is where the problem is. S