"Next" button on "get pages" page

Hello!

I’m currently using this code to show all the immediate children of a certain page on the website:

<?php $mypages = get_pages( array( 'child_of' => $post->ID, 'parent' => $post->ID, 'sort_column' => 'post_date', 'sort_order' => 'desc' ) );
	foreach( $mypages as $page ) {
		$excerpt = $page->post_excerpt;
		if ( ! $excerpt ) // Check for empty page
			continue;
		$excerpt = apply_filters( 'the_content', $excerpt );
	?>
<br />
<h2><a href="<?php echo get_page_link( $page->ID ); ?>"><?php echo $page->post_title; ?></a></h2>
<div class="entry"><?php echo $excerpt; ?></div>
<br />
<hr />
	<?php
	}
?>

I’m essentially using it to create a “blog” made up of pages (all the children of the page containing this code.) Now, the question is, I want to only show 5 of the pages at a time, and have a “View More” or “View Previous” or even better, a “1 2 3 4…12” nav-type button at the bottom.

How do I do this?

Thanks!
John-Andrew