How do I add posts on a templated page used as home ?

Hello,
I have a wordpress website built with pages, like a classic website. It looks like the following :
– page named “home” (page_id=2) uses a template homepage.php and is set as homepage in WP prefs
– page named “misc” (page_id=3) uses a template misc.php

When I go to my web site, I get the content of page “home” with an url like “www.mysite.com/”. I can browse to the “misc” page and the url will be “www.mysiste.com/?page_id=3”. Note the fact that page_id is not set or displayed for the homepage as it is the cause of my problem.

Let’s say I want to display posts in each page. I add some PHP code to each template, using posts_query to retrieve the posts I want (i.e. “home” will display all posts while “misc” will display only one category). All works well until I want to page the posts displayed : e.g. I have 10 posts and I want to display 4 per page.

It works as expected on the “misc” page which is not set as homepage (I get urls like mysite.com?page_id=3&paged=2) but it doesn’t work on the “home” page. As the page_id in the url is not set (mysite.com/?paged=2 instead of mysite.com/?page_id=2&paged=2) : when displaying the previous posts I get the index.php page instead of my homepage.php template.

Any idea of how to display paged posts on a templated page set as homepage ?

Here is the code of my homepage.php template, if it can help to point out a problem :

<?php
/**
 * @package WordPress
 * @subpackage Default_Theme
 */
/*
Template Name: Homepage
*/
?>

<?php get_header(); ?>

<div id="content" class="narrowcolumn">

	<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
		<div class="post" id="post-<?php the_ID(); ?>">
			<div class="entry">
				<div id="homepage_text">
					<?php the_content(); ?>
				</div>
			</div>
		</div>

		<?php edit_post_link('Edit this page.', '<p>', '</p>'); ?>
	 <?php endwhile; endif; ?>

	<div id="blog">
		<?php query_posts('showposts=4'.'&paged='.$paged);

		global $more;
		// set $more to 0 in order to only get the first part of the post
		$more = 0; 

		while (have_posts()) : the_post(); ?>
			<div <?php post_class() ?>>
				<small class="blog_date"><?php the_time('l j F Y') ?></small>
				<h3 id="post-<?php the_ID(); ?>"><a>" rel="bookmark" title="Permalink to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h3>
				<div class="entry">
					<?php the_content('Read the full article &raquo;'); ?>
				</div>
				<p class="postmetadata">
				<?php the_tags('Keywords&nbsp;: ', ', ', ''); ?> Published in <?php the_category(', ') ?> | <?php edit_post_link('Edit', '', ' | '); ?>  <?php comments_popup_link('No comment ?', '1 comment ?', '% comments ?', 'comments-link', 'Commentaires are closed'); ?>
				</p>
			</div>

		<?php endwhile; ?>

		<div class="navigation">
			<div class="alignleft"><?php next_posts_link('&laquo; Older articles') ?></div>
			<div class="alignright"><?php previous_posts_link('Newer articles &raquo;') ?></div>
		</div>
		<?php wp_reset_query(); ?>

	</div>
</div>

<?php /* get_sidebar(); */ ?>
<?php get_footer(); ?>