My background is gone…

So I changed the comments.php file so I could get rid of some form fields. This is my file right now:

<?php if ( have_comments() ) : ?>
			<h3 id="comments-title"><?php
			printf( _n( 'One Response to %2$s', '%1$s Responses to %2$s', get_comments_number(), 'twentyeleven' ),
			number_format_i18n( get_comments_number() ), '<em>' . get_the_title() . '</em>' );
			?></h3>

<?php if ( get_comment_pages_count() > 1 && get_option( 'page_comments' ) ) : // Are there comments to navigate through? ?>
			<div class="navigation">
				<div class="nav-previous"><?php previous_comments_link( __( '<span class="meta-nav">←</span> Older Comments', 'twentyeleven' ) ); ?></div>
				<div class="nav-next"><?php next_comments_link( __( 'Newer Comments <span class="meta-nav">→</span>', 'twentyeleven' ) ); ?></div>
			</div> <!-- .navigation -->
<?php endif; // check for comment navigation ?>

			<ol class="commentlist">
				<?php
					/* Loop through and list the comments. Tell wp_list_comments()
					 * to use twentyeleven_comment() to format the comments.
					 * If you want to overload this in a child theme then you can
					 * define twentyeleven_comment() and that will be used instead.
					 * See twentyeleven_comment() in twentyeleven/functions.php for more.
					 */
					wp_list_comments( array( 'callback' => 'twentyeleven_comment' ) );
				?>

<?php if ( get_comment_pages_count() > 1 && get_option( 'page_comments' ) ) : // Are there comments to navigate through? ?>
			<div class="navigation">
				<div class="nav-previous"><?php previous_comments_link( __( '<span class="meta-nav">←</span> Older Comments', 'twentyeleven' ) ); ?></div>
				<div class="nav-next"><?php next_comments_link( __( 'Newer Comments <span class="meta-nav">→</span>', 'twentyeleven' ) ); ?></div>
			</div><!-- .navigation -->
<?php endif; // check for comment navigation ?>

<?php else : // or, if we don't have comments:

	/* If there are no comments and comments are closed,
	 * let's leave a little note, shall we?
	 */
	if ( ! comments_open() ) :
?>
	<p class="nocomments"><?php _e( 'Comments are closed.', 'twentyeleven' ); ?></p>
<?php endif; // end ! comments_open() ?>

<?php endif; // end have_comments() ?>

<?php comment_form(); ?>

</div><!-- #comments -->

[Please use the code buttons when posting code here – as is, your code may have been damaged.]

But now my background is gone… You can see the website itsself here http://tourclubdekroon.nl/gastenboek/ How can I fix this problem? Please help!!