дополнение для кода выше в incfiles/classes/funtions.php
заменить
$out .= (time() > $user['lastdate'] + 300 ? '<span class="red"> [Off]</span>' : '<span class="green"> [ON]</span>');на
if($user['invis']==0){$out .= (time() > $user['lastdate'] + 300 ? '<span class="red"> [Off]</span>' : '<span class="green"> [ON]</span>');}