Related Posts by Tag – View all posts

I need help! I’m using the below code to generate a list of related posts by tags. I currently have it set to show the latest 4 posts.. but how to i generate a “view all” link to show the remaining posts that have the same related tag?

<?php  //for use in the loop, list 5 post titles related to first tag on current post
  $backup = $post;  // backup the current object
  $tags = wp_get_post_tags($post->ID);
  $tagIDs = array();
  if ($tags) {
    $tagcount = count($tags);
    for ($i = 0; $i < $tagcount; $i++) {
      $tagIDs[$i] = $tags[$i]->term_id;
    }
    $args=array(
      'tag__in' => $tagIDs,
      'post__not_in' => array($post->ID),
      'showposts'=>4,
      'caller_get_posts'=>1
    );
    $my_query = new WP_Query($args);
    if( $my_query->have_posts() ) {
      while ($my_query->have_posts()) : $my_query->the_post(); ?>
			<li><span><?php the_date() ?></span><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></li>
      <?php endwhile;
    } else { ?>
      <p>No related posts found!</p2>
    <?php }
  }
  $post = $backup;  // copy it back
  wp_reset_query(); // to use the original query again
?>