php code

Hi everybody,
I’m not the php professional, so hopefully someone can help me out:

HOW TO change tis code

<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

li><h2>Last Comments</h2>
<ul id=”recent_comments”>
<?php
global $wpdb;
$sql = “SELECT DISTINCT ID, post_title, post_password, comment_ID, comment_post_ID,
SUBSTRING(comment_content,1,80) AS com_excerpt
FROM $wpdb->comments
LEFT OUTER JOIN $wpdb->posts ON ($wpdb->comments.comment_post_ID =
$wpdb->posts.ID)
WHERE comment_approved = ‘1’ AND comment_type = ” AND
post_password = ”
ORDER BY comment_date DESC
LIMIT 4″;
$comments = $wpdb->get_results($sql);
$output = $pre_HTML;
foreach ($comments as $comment) {
$output .= “\n

• ID) .
  “#comment-” . $comment->comment_ID . “\” title=\”on ” .
  $comment->post_title . “\”>” .strip_tags($comment->com_excerpt).
  “…“;
  }
  $output .= $post_HTML;
  echo $output;?>
  <!– END –>

>>>>>>>>>>>>>>>>>>>>>>>>

that the output will be:

(authors name) to: titel of article
only the 5 last comments

No exerpt just that.
PLEEESE!