Loop with pagination

I have a loop i need a little help with adding pagination to it so it display 6 posts per page.

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

	<div  <?php post_class(); ?> id="post-<?php the_ID(); ?>">
		<h1><?php the_title(); ?></h1>
		<?php
$attachments = get_children(array('post_parent' => $post->ID,
						'post_status' => 'inherit',
						'post_type' => 'attachment',
						'post_mime_type' => 'image',
						'order' => 'ASC',
						'orderby' => 'menu_order ID'));

foreach($attachments as $att_id => $attachment) {
	$full_img_url = wp_get_attachment_url($attachment->ID);
        $split_pos = strpos($full_img_url, 'wp-content');
        $split_len = (strlen($full_img_url) - $split_pos);
        $abs_img_url = substr($full_img_url, $split_pos, $split_len);
        $full_info = @getimagesize(ABSPATH.$abs_img_url);
		$img_desc = $attachments->post_excerpt;
        ?>

			<a class="popupimage" href="<?php echo $full_img_url; ?>" title="<?php echo $attachment->desc ; echo $attachment->post_content; ?>" target="_blank"><img  src="<?php echo $full_img_url; ?>" /></a>

<?php
}
?>

		<?php the_content(); ?>
	</div>

<?php endwhile; ?>

	<div class="navigation">
		<div class="next-posts"><?php next_posts_link(); ?></div>
		<div class="prev-posts"><?php previous_posts_link(); ?></div>
	</div>

<?php else : ?>

	<div <?php post_class(); ?> id="post-<?php the_ID(); ?>">
		<h1>Not Found</h1>
	</div>

<?php endif; ?>