wp_link_pages(‘next_or_number=next’) doesn’t work on home.php

The frontpage of my blog uses the template home.php. It shows the latest post. I use <?php wp_link_pages(”) ?> for navigation between pages in the post (using the <!–nextpage–> tag).

The weird thing is: <?php wp_link_pages(‘next_or_number=number’) ?> works fine, but <?php wp_link_pages(‘next_or_number=next’) ?> doesn’t show anything.

I use the function <?php wp_link_pages(‘next_or_number=next’) ?> on single.php and page.php templates as well, were it works fine.

This is my code:

<?php /*
Template Name: Home
*/ ?>

<?php get_header(); ?>

<div id="page">
<?php include (TEMPLATEPATH . "/sidebar.php"); ?>
<?php if (have_posts()) :
query_posts('showposts=1');
while (have_posts()) : the_post(); ?>

<div id="date">
	<div class="month"><?php the_time('M') ?></div>
	<div class="day"><?php the_time('d') ?></div>
</div>
<h2><?php the_title(); ?> <a class="comments-link" href="#comments" title="<?php comments_number('Geen reacties','1 reactie','% reacties'); ?>">(<?php comments_number('0','1','%'); ?>)</a></h2>
<div class="clearer"></div>

<?php wp_link_pages('next_or_number=next') ?>

<div class="entry">
<?php the_content('Lees verder &raquo;
'); ?>
</div>
<div class="clearer"></div>

<?php $wp_query->is_single = true; ?>
<?php comments_template(); ?>

<?php endwhile; else: ?>
	<h2 class="center">Niet gevonden</h2>
<?php endif; ?>

<?php include (TEMPLATEPATH . "/footer.php"); ?>