Need Help with Triangle Template and get_posts

Dears,

I am building this website using Triangle Magazine template and I am having this weird problem that is getting on my nerves. I wanted to make 6 pods on the homepage belonging to 6 categories and wanted to have the latest posts from each show there.

I did that by writing the following code:

$post_ids = array(0);
			foreach( array(9,10,13,14,15,16) as $cat_id ) {
					if ( $posts = get_posts(array('category' => $cat_id, 'numberposts' => 1)) ) {
							$first = array_shift($posts);
							$post_ids[] = $first->ID;
					}
			}
			query_posts(array('post__in' => $post_ids));

The problem is that the code is displaying Ids though I have no echo anywhere. Please have me out here guys.

Regards,

Maddy