PHP array for specific pages only…

I’ll try to be brief, but comprehensive to not waste reader’s time.

I have an old site with a custom theme I created that is successfully displaying pages of certain categories and sub categories (the code snippet below). So, in an attempt to do it differently (re-designing the theme), I used the same code hoping to display a smaller number of the pages, but no longer sub-categories. for those who know PHP,it’s easier I imagine if you see the code (not just my bad description), but before I post the code…

The goal: show 5 random pages from a certain type of pages as an array, showing the page’s thumbnail and title, all of which are being grabbed from custom fields.

The problem: this code below grabs from ALL the pages on the site, not just the ones I’m trying to target.

Challenge: I’m a creative pro with HTML/CSS experience, but not much PHP experience. The original PHP code came from a tutorial (works great), but a tutorial that didn’t explain the alternate possibilities. Tried to troubleshoot this but am out of my range.

Let me know if this makes sense or is “too much to ask” in a post like this. A bit stumped – help is appreciated.

$categoriesCF = get_post_meta($post->ID, "categories", true);
$allCategories = explode(",", $categoriesCF);

		foreach ($allCategories as $category) {
			$pieces = explode("|", $category);
			$link = get_permalink($pieces[1]);
			echo "<div>";

query_posts("posts_per_page=5&post_type=page&post_parent=$pieces[1]&orderby=rand");
while (have_posts()) : the_post();
?>

<a href="<?php the_permalink(); ?>"><div>
<img src="<?php echo get_post_meta($post->ID, 'modelImage', true); ?>" width="100%"/>
<h2><?php echo get_post_meta($post->ID, 'name', true); ?></h2>
</div></a>

<?php endwhile; wp_reset_query();

echo "</div>";	

};