adding php to templates

[ajnin]

i have read all that i have been able to find on these forums about the process.

i created the following:
plugin
hook: global_start
title: Random Adbar Images
php:

ob_start();
include('http://www.pocketpcer.com/forums/includes/php_files/adbar.php');
global $adbar;
$adbar = ob_get_contents();
ob_end_clean();

Php include file

<?php
$adbar_pos1 = rand(1,3);
$adbar_pos2 = rand(1,3);
$adbar_pos3 = rand(1,3);
$adbar_pos4 = rand(1,3);
?>
<table width="728" height="77" border="0" cellpadding="0" cellspacing="0">
	<tr>
		<td>
			<img src="http://www.pocketpcer.com/forums/images/ads/pocketpc-ad1-<?php echo $adbar_pos1?>.gif " width="184" height="77" alt=""></td>
		<td>
			<img src="http://www.pocketpcer.com/forums/images/ads/pocketpc-ad2-<?php echo $adbar_pos2?>.gif" width="180" height="77" alt=""></td>
		<td>
			<img src="http://www.pocketpcer.com/forums/images/ads/pocketpc-ad3-<?php echo $adbar_pos3?>.gif " width="181" height="77" alt=""></td>
		<td>
			<img src="http://www.pocketpcer.com/forums/images/ads/pocketpc-ad4-<?php echo $adbar_pos4?>.gif " width="183" height="77" alt=""></td>
	</tr>
</table>

so i think i have done everything that is suggested. i am at a solid wall please help. thanks in advance