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This is what written in their website:-
"Our auto overlay script tool allows you to earn money from automatically loading AdFoc.us advertisements in your website. This script will take the URL the visitor is currently browsing on your website and automatically display the AdFoc.us advertisement. When the user clicks "Skip," they are returned to that same page.
Use the code below to automatically overlay your website with AdFoc.us ads:
<script type="text/javascript" src="http://adfoc.us/js/siteoverlay/script.js"></script><script type="text/javascript">var id_user = 68928;var frequency_cap = 2;var delay_nextad = 10;var delay_pageload = 0;</script>
The required variables to send are id_user (your AdFoc.us user ID), frequency_cap (the maximum times an ad is displayed in 24 hours), delay_nextad (the delay time, in minutes, between ads), and delay_pageload (the delay time, in seconds, before an ad is displayed after a user loads the page). These variables will determine when advertisements are displayed on your website. Therest is done automatically!
Use the auto overlay script on pages that do not rely and posted variables (ie: do not place this script where users submit forms orany other $_POST data)."