Category loop problems

Hello.

I am trying to make a custom loop for what I would call a “box”. The reason behind creating this box is that it is used to display a list of post from different categories. Wherever I want to have the box included I use the following code:

<?php
$boxclass = "list";
$boxname = "Sound";
$showposts = "5";
$catnr = "3";
include("module_boxlist.php");
?>

The content of module_boxlisted.php is:

<div class="<?php echo $boxclass; ?>">
					<h4><?php echo $boxname; ?></h4>
					<ul>
						<?php query_posts('showposts=' . $showposts . '&cat=' . $catnr );
	  						while (have_posts()) : the_post();
						?>

						<li><a href="<?php the_permalink(); ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></li>
    					<?php endwhile; ?>
					</ul>
</div>

Anyone have an idea about why the loop fails?