- array_push($html, "\n" . '<img src="' . $config->userFrameworkResourceURL .
- "extern/open.php?q=$event_queue_id\" width='1' height='1' alt='' border='0'>"
+ array_push($html, "\n" . '<img src="' . CRM_Utils_System::externUrl('extern/open', "q=$event_queue_id")
+ . '" width="1" height="1" alt="" border="0">'