Show all posts in any given category

maybe two separate issues but the right column jumps around depending on which category I click on as well.

here’s the category template code

?php get_header() ?>

<div class=”post”>

<h2><?php echo single_cat_title(); ?></h2>

<?php $posts = query_posts($query_string . ‘&nopaging=1’); ?>

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

• |
  <?php the_title(); ?>

<?php endwhile; ?>

<?php else : ?>
<?php include (TEMPLATEPATH . ‘/errormessage.php’); ?>
<?php endif; ?>

</div><!– end .post –>

<h4>
<?php posts_nav_link(”,”,’previous page’) ?> |
“><?php _e (‘home’) ?> |
<?php posts_nav_link(”,’next page’,”) ?>
</h4>

<?php get_footer () ?>