Sidebar dropping below content in IE6

I don’t have the know how and I think it’s picking up pages on my “real” site, which I’ll be replacing in a few days anyway.

Can someone help me please?

After many hours I’ve managed to get the errors down to 24, but I don’t know how to fix the others (not including the four ul tags at the bottom).

I know the errors are in the index page and have something to do with the div tags, but I need help with these ones. Can anyone point me in the right direction? What is wrong with the following?

This is the coding:

<?php get_header(); ?>

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

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

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

			<div class="postwrapper wideposts" id="post-<?php the_ID(); ?>">
			  <div class="title">
				<small><?php the_time('j M Y') ?> <?php edit_post_link('(edit)'); ?></small>
				<h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a></h2>
			  </div>
			  <div class="post">
			    <div class="entry">
			      <?php the_excerpt(); ?>
				  <ul class="buttons">
				   <li><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>">Read More &raquo;</a></li>
		            </div>

			      <div class="special"><?php comments_popup_link('No Comments yet...', '1 Comment so far...', '% Comments already...'); ?></div>
			      <div class="postinfo"><p>Filed Under:
				  	<ul class="catlist">
                      <li><?php the_category('</li><li>') ?></li>
	                </ul></p>
			    </div>
			  </div>
			</div>

		<?php endwhile; ?>

	<?php else : ?>

		<div class="title">
		  <h2>Not Found</h2>
		</div>
		<p class="center">Sorry, but you are looking for something that isn't here.</p>
		<?php include (TEMPLATEPATH . "/searchform.php"); ?>

	<?php endif; ?>

	<div class="title">
	  <h2>Categories</h2>
	</div>
	<div class="post">
	  <ul class="catlist">
        <?php wp_list_cats('sort_column=name&hide_empty=0'); ?>
	  </ul>
	</div>
  </div>

<?php get_sidebar(); ?>

<?php get_footer(); ?>

Thank you Whooami, the problem has been solved. I appreciate your help and I learned a lot from this “exercise”.

Many thanks.