Help with WP template

What should I do with this line to display my categories on the page instead of the blank page?

www.fresh-ayr.com

branford magazine theme

Extract:

<?php
/*
Template Name: 3-Column-Page
*/
?>
<?php get_header(); ?>

<div id="pageleft">
  <?php
// this is where you enter the ID of the category you want to display
$display_categories = array(5);
foreach ($display_categories as $category) { ?>
  <?php query_posts("showposts=1&cat=$category"); ?>
  <h3><a href="<?php echo get_category_link($category);?>">
    <?php 
	// this is where the name of each category gets printed	  
	  single_cat_title(); ?>
    </a></h3>
  <?php while (have_posts()) : the_post(); ?>
  <?php

PHP:

Thanks

 

no one know? just need to know what to put in the line for cat ID