Pulling the medium image into search.php no longer works with WP 2.8

Hi,

I am using the function/code below to pull the medium image from post attachments instead of the fulle size one – on search.php and archive.php. That makes them way faster to load.

It worked well up untill i installed WP 2.8.1. Now no image shows up on search/archive pages – unless i manually insert the medium image into posts along with the full-size one. If I delete the medium image from the post again – it still works! It’s like the medium image wasn’t linked correctly when just inserting the full-size image.

Any idea how to fix this or another way to pull the medium image in 2.8.1?

(code below)

NEW FUNCTION FOR FUNCTIONS.PHP

function wp_get_attachment_medium_url($id){
 $medium_array = image_downsize( $id, 'medium' );
 $medium_path = $medium_array[0];
 return $medium_path;
}

SEARCH.PHP – REPLACES THE_CONTENT()

<?php
$files = get_children("post_parent=$id&post_type=attachment&post_mime_type=image");
if($files){
        $keys = array_keys($files);
        $num=$keys[0];
        $thumb=wp_get_attachment_medium_url($num);
        print "<img src=$thumb>";
}
?>