get_post_meta

I am a web designer but I am pretty much brand new to WordPress. I got this code sniplet from a lynda tut and it works well other than it lists back all pages instead of just the child pages of the current page. I hope this makes sense and someone can help.

I am trying to only draw back the immediate children of the list, not the parents or the next set of children

query_posts("posts_per_page=-1&post_type=page&post_parent=$pieces[1]");
while (have_posts()) : the_post(); ?>
<a href="<?php the_permalink(); ?>"
class="product-jump" title="<?php echo get_post_meta($post->ID, "product_price", true); ?>"
data-large="<?php get_post_meta($post->ID, "product_image", true); ?>">
<span class="product-title">
<?php the_title(); ?>
<span class="product-code">
<?php echo get_post_meta($post->ID, "product_code", true); ?><span></a>