Get next 6 thumbnails – get_posts or loop?

Hi,

To begin with I started using the loop function to create a list of thumbnails but when I clicked on a thumbnail/link and got to the post page it only showed the thumbnail for the post. Therefore I’m using the get_posts.

So, I’ve made a list of thumbnails which are linked to their post. The list only needs to show 6 thumbnails at the time. The thing is that I need at “Next” and “Previous” button – just like using the loop.

My question is: Is it possible to make a “Next/Previous” function by using get_posts, or how can I make a list by using the loop function without having the problem when entering a post page?

My get_posts code:

<?php
	$lastposts = get_posts('numberposts=6');
	 foreach($lastposts as $post) :
	setup_postdata($post);
?>

<?php $thumbnail = get_post_meta($post->ID, 'thumbnail', $single = true); ?>  

<?php if($thumbnail !== '') { ?>

	<div class="item fl">
	<a href="<?php the_permalink() ?>">
	<img src="<?php echo $thumbnail;?>" alt="<?php the_title(); ?>" border="0" class="pic_thumb"/></a>

<?php } ?>
</div>
<?php endforeach; ?>

I’m a sorta new to WordPress, so please, help me out here? :o)