get first attachment from a sub page

hi,
it is becoming a very frustrating issue as i cannot figure out how and why it is not working. I need to be able to grab the first image from the attachments of my sub pages; have tried everything.

I need to have it working within this code:

<ul class="thumb">
<?php $pages = get_pages('child_of='.$post->ID.'&sort_column=post_date&sort_order=desc&parent='.$post->ID); foreach($pages as $page) { $content = $page->post_content; if(!$content) continue; ?>

<li cass="thumbList" >
<a href="<?php echo get_page_link($page->ID) ?>" class="clearfix" >
<h1 class="title"> <?php echo $page->post_title ?></h1>
	<?php $key_1_value = get_post_meta($page->ID, 'Preview', true);
	print $key_1_value; ?></a>
</li>
<?php } ?>

help please