gxlrygt

did you try to add 'post_type' => 'page' ?

query_posts($query_string . "&post_parent=0&post_type=page&showposts=$post_number&paged=$paged&cat=$cat");

or

query_posts(array( 'post_type' => 'page', 'post_parent' => 0, 'orderby' => 'menu_order', 'order' => 'DESC' ));

query_posts($query_string . "&post_parent=0&showposts=$post_number&paged=$paged&cat=$cat");

This code just displays subpages deathski

Thanks both of you man!

This is my final code after your help:

<?php
$i = 0;
$count = 3;
global $more;
$more = 0;
$parent_page_id = 1092;
query_posts(array( 'post_type' => 'page',  'post_parent' => $parent_page_id, 'orderby' => 'menu_order', 'order' => 'DESC' ));
if (have_posts()) : ?>
	<?php while (have_posts()) : the_post(); ?>
	<div class="grid_4 <?php if($i % $count == 0) echo 'alpha';else if(($i+1) % $count == 0) echo 'omega';?>">
		<?php
		if ((function_exists('has_post_thumbnail')) && (has_post_thumbnail())){ ?>
		<div class="post-img">
			<a title="<?php get_the_title(); ?>" href="<?php the_permalink(); ?>" rel="bookmark" ><?php the_post_thumbnail('service-img');?></a>
		</div>
		<?php } ?>
		<h3 class="post-title"><?php the_title(); ?></h3>
		<div class="post-content"><?php the_content('Read more &rarr;'); ?></div>
	</div>
	<?php
	$i++;
	endwhile;
endif;
?>