cat loops

<?php  $cats = array('film-reviews','poetry'); //an array with category slugs;

foreach ($cats as $cat_slug) :
$cat = get_term_by('slug',$cat_slug,'category');
$cat_id = $cat->term_id;

$args = array(
'posts_per_page' => 3, // max number of post per category
'category__in' => array($cat_id)
);
$cat_query = new WP_Query($args);

     if ($cat_query->have_posts()) :

     echo '<h2>'.$cat->name.'</h2>';

     while ($cat_query->have_posts()) : $cat_query->the_post(); ?>

    <a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a>

    <?php the_excerpt(); ?>

    <?php endwhile; ?>

    <?php else :
        echo '<h2>No Posts for '.$cat->name.'</h2>';
     endif;

     wp_reset_query(); ?>

<?php endforeach; ?>