Comment form not appearing while replying already posted comments

Hey all, I am fairly new to wordpress…and i’ve been developing a theme for a client’s site(on localhost)..and i’m stuck on a problem and hope u guys can help me out.Here’s the problem:

In my single view posts page….the comments are listed under my post using wp_list_comments and beneath the comments is the comment form.
My problem is, when i press on the reply link for a particlar comment, the comment form does not appear beneath the current comment instead it stays in its original place.Except, the ‘cancel reply’ link appears.How do i solve this?
Here is my comments.php file:

<?php

	 if(!empty($_SERVER['SCRIPT_FILENAME']) && 'comments.php' == basename($_SERVER['SCRIPT_FILENAME']))
	     die('Please do not load this page directly. thanks');

	 if(post_password_required() ) { ?>
	 <p class="noComments">This post is password protected. Please enter the password to view the comments </p>
     <?php
	  return;
	 } ?>

<div id="comments">
    <h5><?php comments_number('No Comments','1 Comment', '% Comments'); ?></h5>

    <?php if(have_comments() ) : ?>

      <ol class="commentlist">
      <?php wp_list_comments('avatar_size=32&type=all'); ?>

    <?php if($wp_query->max_num_pages > 1): ?>
      <div class="pagination">

<ul>
        <li class="older"><?php previous_comments_link('Older'); ?>
        <li class="newer"><?php next_comments_link('Newer'); ?>
        </ul>
      </div>
    <?php endif; ?>
    <?php  endif; ?>

<?php if(comments_open() ) : ?>
  <div id="response">
      <h3 style="color:#09F;">leave a response</h3>
      <form action="<?php echo get_option('siteurl'); ?>/wp-comments-post.php" method="post" id="commentform">
      <fieldset>
      <label for="author">Name:</label>
      <input type="text" name="author" id="author" value="<?php echo $comment_author; ?>"  /> 

      <label for="email">E-mail:</label>
      <input type="text" name="email" id="email" value="<?php echo $comment_author_email; ?>"  />

      <label for="url">Website:</label>
      <input type="text" name="url" id="url" value="<?php echo $comment_author_url; ?>"  />

      <label for="comment">Message:</label>
      <textarea name="comment" id="comment" rows="10" cols="50" ></textarea>

      <input type="submit" class="commentsubmit" value="submit comment"  />

      <?php comment_id_fields(); ?>
      <?php do_action('comment_form', $post->ID ); ?>
      </fieldset>
      </form>

  	  <p class="cancel"><?php cancel_comment_reply_link('Cancel Reply'); ?></p>
</div>

<?php else : ?>
<h3>comments are now closed</h3>
<?php endif; ?>
</div>

Plz help.

[Moderator Note: Please post code or markup snippets between backticks or use the code button. Or better still – use the pastebin. As it stands, your code may now have been permanently damaged/corrupted by the forum’s parser.]