PHP COMMENTS

I have a wordpress build which I modified so the input field is on top of the comments instead of the bottom. The comments post great but when I Reply to a comment (my nested comments) the entire input field moves down instead of opening up an input filed within the comment. Anyone have any ideas on why this is happening?

This is only part of the PHP FILE. The rest I know works

<?php if ( comments_open() ) : ?>
<?php cancel_comment_reply_link('Cancel'); ?>
<?php if ( get_option('comment_registration') && !$user_ID ) : ?>

You must be logged in to post a comment.

		<a class="button" id="submit" href="<?php echo get_option('siteurl'); ?>/wp-login.php?redirect_to=<?php echo urlencode(get_permalink()); ?>"><span>Submit Comment</span></a>
    </div>	
<?php else : ?>
	</div>
    <form action="<?php echo get_option('siteurl'); ?>/wp-comments-post.php" method="post" id="commentform"> 
    <div class="res_2 fright">
        <p><label for="comment">Comment</label>
        <textarea class="fright" name="comment" title="Your jbh..." id="comment" cols="100%" rows="10" tabindex="4"></textarea></p>
		<input name="submit" type="submit" id="submit" tabindex="5" value="Submit Comment" />
        
		<?php comment_id_fields(); ?>
		<?php do_action('comment_form', $post->ID); ?>
    </div>	
    </form>
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