Pagination with wp_query()

Hi,

I am trying to add pagination to my homepage, which collects the last 5 posts from all the categories all over the site. I used a wp_query to show the excerpts:

<?php
$altri_post = new WP_Query('showposts=5');
while($altri_post->have_posts()) : $altri_post->the_post();?>

<h2><a>"><?php the_title()?></a></h2>

<p><?php the_time('d/m/Y'); ?></p>

<?php the_excerpt(); ?>

<?php

endwhile;
wp_reset_postdata();

?>

I would just need 2 links on the bottom with “previous” and “next entries”, but I can’t understand how to do it using wp_query.