Hi,

I have a website on which is a page where a user can fill out a form and register for a workshop. This page leads to a thank you / Payment page. Attached to the Registration and thank you page is a script that links to a Partner Program so I can pay others you refer us a client a bonus.
Now I have the problem that if a user fills the form, presses enter and gets to the Thank You page and reloads this page I get two referralsales which I have to cancel out manually. Once I had for partner sales for one real sale.
Now I read that it is possible to prevent double posting and submitting in PHP.
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Please bid only if you are 100% skiledin doing such stuff. I think its not difficult for an experienced PHP Programmer but as this is a production site and I have no time for experiments please bid only if you really know your stuff.
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So I am looking for someone who can implant this on my webpage on these pages that the form and thank you page will only be submitted once and I get only one registration and one partner sale.

Pages in Question are here:
Registration http://www.imagingschool.de/anmeldung.php
Thank You Payment Page: http://www.imagingschool.de/anmeldungok.php

The Partner Script Link is at the very bottom of the Pages(by example <script id="pap_x2s6df8d" src="http://www.xvm.de/partner/scripts/clickjs.php" type="text/javascript">
</script>) and there are variables like a tim variable which are transferred from one page to the other.
Attached file: PHP Pages.zip
File info: Anmeldung.php and the Anmeldungok.php Page current code