OK I have fixed it, not sure why but 'echo include' was messing it up. Replaced it with 'include' and it now works fine:
Before:
PHP Code:
<?php
$banner_min = 1;
$banner_max = 2;
$random_banner_number = rand($banner_min, $banner_max);
echo include("banner_$random_banner_number.php");?>
After:
Before:
PHP Code:
<?php
$banner_min = 1;
$banner_max = 2;
$random_banner_number = rand($banner_min, $banner_max);
include("banner_$random_banner_number.php");?>