Random banner code - how to use in forum block?

[Jonathan81]

Hi guys, hoping someone can help...

I'm using a random banner code for a few images on my website. Working great within the navbar template with the following code...

$path = '/forum/support/';
$banners = array(
array( 'src' => 'image1.png',
'href' => 'http://www.XXXXXXXXXXX.com/'),
array( 'src' => 'image2.png',
'href' => 'http://www.XXXXXXXXXX.com'),
);


$rnd = rand(0,count($banners)-1); // Pick a random array index.  They start with 0, so you have to -1.
$href = $banners[$rnd]['href'];  // Link HREF
$src = $path.$banners[$rnd]['src']; // Image source
$randombanner4 = '<a href="'.$href.'" target="_blank"><img border="0" src="'.$src.'" /></a>';

vB_Template::preRegister('navbar', array('randombanner4' => $randombanner4));

Then I place {vb:raw randombanner4} within the navbar template and it works perfectly.

My question is this...

I would like to use a random banner within a forum block but when I add {vb:raw randombanner4} to the block code, it doesn't work. Anyone know what I need to do?