replay link dont'work….

Hi , I am a new in wordpress theme developing, and i get a little confused about comments.php.
I did my best, but i still can’t make it run , especially, replay link button. Please help ! There is the code of comments.php

<?php if ( have_comments() ) : ?>
<div class=”gray-border”>
<h4><?php printf( _n( ‘One Comment’, ‘%1$s Comments’, get_comments_number() ),number_format_i18n( get_comments_number() ) ); ?></h4>
</div>
<div class=”gray-border”>

<?php wp_list_comments(); ?>
<?php $args = array(
‘walker’ => null,
‘max_depth’ => ‘3’,
‘style’ => ‘ul’,
‘callback’ => null,
‘end-callback’ => null,
‘type’ => ‘all’,
‘reply_text’ => ‘Reply’,
‘page’ => ”,
‘per_page’ => ”,
‘avatar_size’ => 30,
‘reverse_top_level’ => null,
‘reverse_children’ => ”
); ?>

<div class=”comments-nav clear”>
<?php paginate_comments_links(); ?>
</div>
</div>
<?php else: ?>
<div class=”gray-border”>
<h4>No comments</h4>
</div>
<?php endif; ?>

<div class=”gray-border”>
<?php if ( ! comments_open() ) : ?>
<h4>Comments are closed.</h4>
<?php else: ?>
<h4>Leave a Comment</h4>

<form action=”<?php bloginfo(‘url’); ?>/wp-comments-post.php” method=”post” id=”commentform”>
<input type=’hidden’ name=’comment_post_ID’ value='<?php echo $post->ID; ?>’ id=’comment_post_ID’ />
<input type=”text” value=”Name” name=”author” onfocus=”if(this.value == this.defaultValue) this.value = ””><label>Name / Alias (required)</label>

<input type=”text” value=”Email” name=”email” onfocus=”if(this.value == this.defaultValue) this.value = ””><label>Email Address (required, not shown)</label>

<input type=”text” value=”” name=”url”><label>Website (optional)</label>

<textarea rows=”7″ cols=”60″ name=”comment”></textarea>

<input type=”submit” id=”submit” value=”Add Your Comment” />
</form>
<?php endif; ?>
</div>