WordPress - Recent Comments without a Plugin or Widget

recent-comments.css

.recent-comments { list-style: none; font-size: 12px; color: #485358; }
.recent-comments li { overflow: hidden; padding: 20px 0; border-top: 1px dotted #DADEE1; }
.recent-comments li:first-child { border: 0 none; }
.recent-comments img { float: left; margin-right: 8px; } 
.recent-comments a { display: block; margin-top: 10px; padding-top: 10px; text-transform: uppercase; } 

recent-comments.html

<div class="widget recent-comments">
    <h3>Recent Comments</h3>
    <?php bg_recent_comments(); ?>
</div>

recent-comments.php

<?php
/**
 * Show Recent Comments
 *
 * @author Baki Goxhaj
 * @link http://wplancer.com/how-to-display-recent-comments-without-using-a-plugin-or-widget/ 
 *
 * @param string/integer $no_comments
 * @param string/integer $comment_len
 * @param string/integer $avatar_size
 * 
 * @echo string $comm
 */
function bg_recent_comments($no_comments = 5, $comment_len = 80, $avatar_size = 48) {
	$comments_query = new WP_Comment_Query();
	$comments = $comments_query->query( array( 'number' => $no_comments ) );
	$comm = '';
	if ( $comments ) : foreach ( $comments as $comment ) :
		$comm .= '<li><a class="author" href="' . get_permalink( $comment->comment_post_ID ) . '#comment-' . $comment->comment_ID . '">';
		$comm .= get_avatar( $comment->comment_author_email, $avatar_size );
		$comm .= get_comment_author( $comment->comment_ID ) . ':</a> ';
		$comm .= '<p>' . strip_tags( substr( apply_filters( 'get_comment_text', $comment->comment_content ), 0, $comment_len ) ) . '...</p></li>';
	endforeach; else :
		$comm .= 'No comments.';
	endif;
	echo $comm;	
}

if it can ajax load more comments, it will more great!