Previous and Next

I have this code, it works fine to my website but I need to add a code that will work with Previous and Next because I have 50 posts on my blog that is category 4 and I want it everytime I have to click the Next it will show the next 5 category 4. Vice versa I have to click the Previous to go to the previous 5 list category 4. How I am going to put that code using the code below. Thanks.

<?php query_posts('cat=4&showposts=5');
if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
<p><a href="<?php the_permalink() ?>" rel="bookmark" title="permalink to <?php the_title(); ?>"><?php the_title(); ?></a></p>
<p><?php the_time('d, M, Y') ?></p>
<?php endwhile; else: ?>
<p><?php _e('Sorry, no posts matched your criteria.'); ?></p>
<?php endif; ?>