title: order posts by custom field
body: <p>i'm using this query</p>
  
  <pre><code>$numposts = get_option('posts_per_page');
  $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
  query_posts('cat=5&amp;showposts='.$numposts.'&amp;paged=' . $paged); 
  </code></pre>
  
  <p>how to order the posts by custom field?</p>