How to highlight admin comments

Hello, I am using the following code to generate my comments. What is the best way to highlight admin comments?

<?php foreach($comments as $comment) : ?>
<?php $i++; ?>
<ul <?php alternate_rows($i); ?> id=”comments”>

• <?php echo get_avatar($comment,$size=’60’,$default='<path_to_url>’ ); ?>

<li id=”comment-<?php comment_ID(); ?>”> <?php comment_author_link(); ?> – <?php comment_date(); ?> at <?php comment_time(); ?>

• <?php if ($comment->comment_approved == ‘0’) : ?>
  <p>Your comment is awaiting approval</p>
  <?php endif; ?>
  <?php comment_text(); ?>
  <?php //comment_type(); ?>

<?php endforeach; ?>