<?php
// use the page id to get the corresponding category id
if ( is_page('16') )  $myId = 6;
elseif ( is_page('6') )  $myId = 7;
else  $myId = 3;

$myArgs = "cat=$myId";
?>

     <?php query_posts($myArgs); ?>
     <?php if (have_posts()) : ?>

         <?php while (have_posts()) : the_post(); ?>
             <div class="post" id="post-<?php the_ID(); ?>">
                 <h2><?php the_title(); ?></h2>

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

             </div>
  
         <?php endwhile; ?>

       <?php else : ?>

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

     <?php endif; ?>

$defaults = array(
'show_option_all' => '',
'orderby' => 'name',
'order' => 'ASC',
'show_last_update' => 0,
'style' => 'list',
'show_count' => 0,
'hide_empty' => 1,
'use_desc_for_title' => 1,
'child_of' => 0,
'feed' => '',
'feed_image' => '',
'exclude' => '',
'hierarchical' => true,
'title_li' => __('Categories'),
'echo' => 1,
'depth' => 0
);

wp_list_categories($defaults);