test

<section id="slideshow">
    <div>
        <div></div>
        <div>
            <?php
            query_posts('posts_per_page=4&meta_key=_thumbnail_id&meta_compare=!=&meta_value= ');
                while ( have_posts() ) : the_post(); ?><a href="<?php echo the_permalink(); ?>" title="Lire l\'article"><figure><?php the_post_thumbnail( array(640,310) ); ?><figcaption><?php the_title(); ?></figcaption></figure></a>
                <?php endwhile;
            wp_reset_query(); ?>
        </div>
    </div>
    <span id="timeline"></span>
</section>