How to include smilies in comments

Hi there,

i am using the plugin for a while now. It’s all okay so far but i can’t see smilies under my comments. what i have to add / change?

<?php
	function wpmg_comments($comment, $args, $depth){
	$GLOBALS['comment'] = $comment;
	$ctxt = get_comment_text();
	$ctxt = preg_replace('~(https?://[a-z0-9\.\-\=\_\#\&\?/]+)~i', '<a href="$1" target="_blank">[ Link ]</a>', $ctxt);
?>
	<div class="single_comment">
		<div  class="sc_autor"><a href="<?php comment_author_url(); ?>" target="_blank"><?php comment_author(); ?></a><a name="comments-<?php comment_ID(); ?>"></a></div>
		<div class="sc_datetime"><a href="<?php comments_link(); ?>-<?php comment_ID(); ?>"><?php comment_date();?> - <?php comment_time(); ?></a></div></p>
		<p class="sc_text"><?php echo(get_avatar($comment, 64). $ctxt); ?></p>
	</div>
<?php } ?>