child pages query ?

hey guys am using the below query to pull my child pages

<?php
query_posts('post_type=page&post_parent='.$parent);
?>
	<?php if ( have_posts() ) while ( have_posts() ) : the_post(); ?> 

my content here

<?php endwhile; ?>

				<?php wp_reset_query(); ?>

now the problem is when i click on a link of one of the child pages its not showing me the scorrect content rather the latest child page content under the parent page…how do i tweak the code ?

Thanks