Login users only

hey guys i just added fank.ru grabber and few other grabbers in my johncms but it totally open i want to allow login users only connect to my grabber how can make permission
i added core.php and head.php

andrew3008,

if ($user_id) {
// if user loginned
 to site
} else {
echo '<div class="rmenu">For registered users only</div>';
}