1,
'cat' => $categoryid,
'posts_per_page' => $number,
);
$loop = new WP_Query($args);
$i = -1;
if ($loop->have_posts()) : while ($loop->have_posts()) : $loop->the_post();
$image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'pinwheel-feature-thumb' );
$i++;
?>