header change

[newone]

when I was useing v2.3.4 you guys gave me some code that would change the header gif to each category when a member visit that category. the code looked like this

<tr>
<?php
$filename = $template_path . '/images/' . $type . '.gif' ;
if (file_exists($filename)) {
echo "<td colspan=\"2\"><a href=\"index.php\"><img src=\"" . $template_path . "/images/" . $type . ".gif\" width=\"767\" height=\"127\" border=\"0\" alt=\"" . $title . "\" /></a></td>" ;
} else {
echo "<td colspan=\"2\"><a href=\"index.php\"><img src=\"" . $template_path . "/images/header.gif\" width=\"767\" height=\"127\" border=\"0\" alt=\"" . $title . "\"/></a></td>" ;
}
?>
</tr>

I am now useing V3.0.15 and I know this code will not work. I would like this option to run on the new version. Need some help please. Also I think this would be a good options for the future versions.