WordPress/wp-includes/theme-compat/comments.php

<?php
/**
 * @package WordPress
 * @subpackage Theme_Compat
 * @deprecated 3.0
 *
 * This file is here for Backwards compatibility with old themes and will be removed in a future version
 *
 */
_deprecated_file( sprintf( __( 'Theme without %1$s' ), basename(__FILE__) ), '3.0', null, sprintf( __('Please include a %1$s template in your theme.'), basename(__FILE__) ) );

// Do not delete these lines
	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"><?php _e('This post is password protected. Enter the password to view comments.'); ?></p>
	<?php
		return;
	}
?>

<!-- You can start editing here. -->

<?php if ( have_comments() ) : ?>
	<h3 id="comments">
		<?php
			if ( 1 == get_comments_number() ) {
				/* translators: %s: post title */
				printf( __( 'One response to %s' ),  '&#8220;' . get_the_title() . '&#8221;' );
			} else {
				/* translators: 1: number of comments, 2: post title */
				printf( _n( '%1$s response to %2$s', '%1$s responses to %2$s', get_comments_number() ),
					number_format_i18n( get_comments_number() ),  '&#8220;' . get_the_title() . '&#8221;' );
			}
		?>
	</h3>

	<div class="navigation">
		<div class="alignleft"><?php previous_comments_link() ?></div>
		<div class="alignright"><?php next_comments_link() ?></div>
	</div>

	<ol class="commentlist">
	<?php wp_list_comments();?>
	</ol>

	<div class="navigation">
		<div class="alignleft"><?php previous_comments_link() ?></div>
		<div class="alignright"><?php next_comments_link() ?></div>
	</div>
 <?php else : // this is displayed if there are no comments so far ?>

	<?php if ( comments_open() ) : ?>
		<!-- If comments are open, but there are no comments. -->

	 <?php else : // comments are closed ?>
		<!-- If comments are closed. -->
		<p class="nocomments"><?php _e('Comments are closed.'); ?></p>

	<?php endif; ?>
<?php endif; ?>

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

<div id="respond">

<h3><?php comment_form_title( __('Leave a Reply'), __('Leave a Reply to %s' ) ); ?></h3>

<div id="cancel-comment-reply">
	<small><?php cancel_comment_reply_link() ?></small>
</div>

<?php if ( get_option('comment_registration') && !is_user_logged_in() ) : ?>
<p><?php printf(__('You must be <a href="%s">logged in</a> to post a comment.'), wp_login_url( get_permalink() )); ?></p>
<?php else : ?>

<form action="<?php echo site_url(); ?>/wp-comments-post.php" method="post" id="commentform">

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

<p><?php printf(__('Logged in as <a href="%1$s">%2$s</a>.'), get_edit_user_link(), $user_identity); ?> <a href="<?php echo wp_logout_url(get_permalink()); ?>" title="<?php esc_attr_e('Log out of this account'); ?>"><?php _e('Log out &raquo;'); ?></a></p>

<?php else : ?>

<p><input type="text" name="author" id="author" value="<?php echo esc_attr($comment_author); ?>" size="22" tabindex="1" <?php if ($req) echo "aria-required='true'"; ?> />
<label for="author"><small><?php _e('Name'); ?> <?php if ($req) _e('(required)'); ?></small></label></p>

<p><input type="text" name="email" id="email" value="<?php echo esc_attr($comment_author_email); ?>" size="22" tabindex="2" <?php if ($req) echo "aria-required='true'"; ?> />
<label for="email"><small><?php _e('Mail (will not be published)'); ?> <?php if ($req) _e('(required)'); ?></small></label></p>

<p><input type="text" name="url" id="url" value="<?php echo  esc_attr($comment_author_url); ?>" size="22" tabindex="3" />
<label for="url"><small><?php _e('Website'); ?></small></label></p>

<?php endif; ?>

<p><textarea name="comment" id="comment" cols="58" rows="10" tabindex="4"></textarea></p>

<p><input name="submit" type="submit" id="submit" tabindex="5" value="<?php esc_attr_e('Submit Comment'); ?>" />
<?php comment_id_fields(); ?>
</p>
<?php
/** This filter is documented in wp-includes/comment-template.php */
do_action( 'comment_form', $post->ID );
?>

</form>

<?php endif; // If registration required and not logged in ?>
</div>

<?php endif; // if you delete this the sky will fall on your head ?>