Exclude global_start from register.php?

[slobra]

I've created this global_start plugin to display a list of sponsor images on my forum:

ob_start();
include('/home/username/site.com/forums/sponsors.php');
$includedphp = ob_get_contents();
ob_end_clean();

I'm calling it in the footer template. The list shows up on every page but I want to exclude it from register.php. I know there's a way to do this but I don't know how. Can someone help? Thanks!