Validation problems

Hi!
I have redesinged the postmetadata section of my website and since then I have a couple of validation errors. I’m quite new to WordPress and CSS, and I don’t really know how to fix these errors.

Validation results: here
Affected pages:
Index.php:

<?php get_header(); ?>

	<div id="content" class="narrowcolumn">

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

		<?php while (have_posts()) : the_post(); ?>

			<div class="post" id="post-<?php the_ID(); ?>">
				<h2><a>" rel="bookmark" title="<?php printf(__('Permanent Link to %s', 'kubrick'), the_title_attribute('echo=0')); ?>"><?php the_title(); ?></a></h2>
<?php if(function_exists('the_ratings')) { the_ratings(); } ?>
				<small><?php the_time(__('Y. F d. l', 'kubrick')) ?> <!-- by <?php the_author() ?> --></small>

				<div class="entry">
					<?php the_content(__('Read the rest of this entry &raquo;', 'kubrick')); ?>
				</div>

				<p class="postmetadata"><?php the_tags(__('Tags:', 'kubrick') . ' ', ', ', ''); ?> <img src="http://hookahclub.org/wp-content/themes/default/images/document.gif"> <?php printf(__('Kategória: %s', 'kubrick'), get_the_category_list(', ')); ?> | <?php edit_post_link(__('Edit', 'kubrick'), '', ' | '); ?>  <span class="nocomments"><?php comments_popup_link(__('0', 'kubrick'), __('1 »', 'kubrick'), __('% »', 'kubrick')); ?></span>

			</div>

		<?php endwhile; ?>

		<div class="navigation">
			<div class="alignleft"><?php next_posts_link(__('&laquo; Older Entries', 'kubrick')) ?></div>
			<div class="alignright"><?php previous_posts_link(__('Newer Entries &raquo;', 'kubrick')) ?></div>
		</div>

	<?php else : ?>

		<h2 class="center"><?php _e('Not Found', 'kubrick'); ?></h2>
		<p class="center"><?php _e('Sorry, but you are looking for something that isn’t here.', 'kubrick'); ?>

		<?php include (TEMPLATEPATH . "/searchform.php"); ?>

	<?php endif; ?>

	</div>

<?php get_sidebar(); ?>

<?php get_footer(); ?>

and single.php:

<?php get_header(); ?>

	<div id="content" class="narrowcolumn">

	<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

                <div class="navigation">
			<div class="alignleft"><?php previous_post_link('&laquo; %link') ?></div>
			<div class="alignright"><?php next_post_link('%link &raquo;') ?></div>
                </div>

<div class="post" id="post-<?php the_ID(); ?>">
			<h2><?php the_title(); ?></h2>
<?php if(function_exists('the_ratings')) { the_ratings(); } ?>
<small><?php the_time(__('Y. F d. l', 'kubrick')) ?></small>
			<div class="entry">
				<?php the_content('<p class="serif">' . __('Read the rest of this entry &raquo;', 'kubrick') . '
'); ?>

				<?php wp_link_pages(array('before' => '<strong>' . __('Pages:', 'kubrick') . '</strong> ', 'after' => '
', 'next_or_number' => 'number')); ?>
				<?php the_tags( '' . __('Tags:', 'kubrick') . ' ', ', ', '
'); ?>

				<p class="postmetadataalt">
					<small>
						<?php /* This is commented, because it requires a little adjusting sometimes.
							You'll need to download this plugin, and follow the instructions:
							http://binarybonsai.com/archives/2004/08/17/time-since-plugin/ */
							/* $entry_datetime = abs(strtotime($post->post_date) - (60*120)); $time_since = sprintf(__('%s ago', 'kubrick'), time_since($entry_datetime)); */ ?>
						<?php printf(__('Kategória: %s', 'kubrick'), get_the_category_list(', ')); ?>
						| <?php printf(__("<a href='%s'>Hozzászólások RSS csatornán</a>", "kubrick"), get_post_comments_feed_link()); ?> 

						<?php if (('open' == $post-> comment_status) && ('open' == $post->ping_status)) {
							// Both Comments and Pings are open ?>
							| <?php printf(__('<a href="%s" rel="trackback">Visszajelzés</a>', 'kubrick'), trackback_url(false)); ?>

						<?php } elseif (!('open' == $post-> comment_status) && ('open' == $post->ping_status)) {
							// Only Pings are Open ?>
							<?php printf(__('Responses are currently closed, but you can <a href="%s" rel="trackback">trackback</a> from your own site.', 'kubrick'), trackback_url(false)); ?>

						<?php } elseif (('open' == $post-> comment_status) && !('open' == $post->ping_status)) {
							// Comments are open, Pings are not ?>
							<?php _e('You can skip to the end and leave a response. Pinging is currently not allowed.', 'kubrick'); ?>

						<?php } elseif (!('open' == $post-> comment_status) && !('open' == $post->ping_status)) {
							// Neither Comments, nor Pings are open ?>
							<?php _e('Both comments and pings are currently closed.', 'kubrick'); ?>

						| <?php } edit_post_link(__('Edit this entry.', 'kubrick'),'',''); ?>
					</small>

			</div>
		</div>

	<?php comments_template(); ?>

	<?php endwhile; else: ?>

		<?php _e('Sorry, no posts matched your criteria.', 'kubrick'); ?>

<?php endif; ?>

	</div>

<?php get_sidebar(); ?>

<?php get_footer(); ?>

My site:here

If you could send me a valid copy of these pages or show me the (detailed!) way it can be fixed, would be very kind of you!

Regards,
shylaz