vBulletin variables doesn't work

[Fabikus]

Hi, i need to exclude some banners in some forums id (and his discussions).
I use this code but it shows banner2 only into theese forum id index, instead it show banner1 into discussions of this forum. What can i do?

This is the code i use (i use it into header template):

<if condition="!in_array($_GET['f'], array(26,38,47,71,72,73))">
$banner1
</if>
<if condition="in_array($_GET['f'], array(26,38,47,71,72,73))">
$banner2
</if>