See if this is what you are wanting. i have this inside my scp/tickets.php right at the top under the requires.
define('MAIN_PAGE',1);
# This is a custom hack to make the ticket page refresh every 60 seconds - leave it!
if(defined('MAIN_PAGE') && !isset($_GET) && !isset($_GET) && !isset($_GET)) {
echo "<meta http-equiv='refresh' content='60'>";
}
If you want it every 5 minutes then just change the 60 to 300.