[ConqSoft]

If you're using a version of vBulletin before 3.5.x, I can't help you. For 3.5.x and up, create a plugin at the global_start hook and place your code there.

I generate a random number to grab a random header on my site. Here's the code I use in my plugin:

mt_srand((double)microtime()*1000000);
$fb_header_random = mt_rand(1, 9);

Then, the $fb_header_random variable will be available to me in the header template. (or any other template since I'm executing at the global_start hook)

I use this in my header:

<img alt="" src="/forums/images/header/$fb_header_random.jpg" height="94" width="899" />