Adding Pagination on a Custom Author Page

i have created a custom author’s page that list the title of their posts. but the problem is i can’t get the pagination to work if it’s beyond the set post per page value. i have used get_posts() to it’s custom loop.

<?php 
                    $ppp = 5; //set my custom number of post to appear
                    $uid = $curauth->ID;
                    $args = array(
                                    'numberposts' => $ppp,
                                    'author' => $uid

                                );
                    $authorposts = get_posts($args);
                    //print_r($authorposts);
                    if ( count( $authorposts ) > 0 ) {               

                        foreach ( $authorposts as $post ):  setup_postdata($post)            ?>
                            <li>


                                <a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>" class="authorpostlink"><?php the_title(); ?></a>
                                <?php the_excerpt(); ?>
                            </li>
                    <?php endforeach;  ?>
                        <div class="post-nav">
                            <div class="previous"><?php previous_posts_link('&lsaquo; Previous Page') ?></div>
                            <div class="next"><?php next_posts_link('Next Page &rsaquo;') ?></div>
                        </div>
                    <?php
                    } else {
                        echo '<p>No articles by this user</p>';
                    }       
                    ?>

This should display 5 post with it’s title and it’s excerpt by the author,….but the rest of the author’s posts isn’t paginated what it paginates is the whole number of post on the blog.