Footer.php Action Hook
One piece of code that should be included with your theme, but is not required, is the action hook, wp_footer().
Most theme developers, however, do include this hook in the footer.php file. Personally, this hook should be required for all themes. Since it is optional, you need to add it to your footer.php file if it does not already exist. The cd-ad-sponsor plug-in uses this hook to reset the database table of sponsor ads that have been displayed.
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