Problem with Sidebar CSS Properties….

to show recent posts from specific category i am using following code.

<strong><p class="recentheading">Latest Albums</p>
<?php query_posts('showposts=5&cat=1'); ?>
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

<span class="recentp">

<ul>
        <a>">
<li><?php the_title() ?></li>
</a>
    </ul>
</span>
<?php endwhile; endif;
wp_reset_query();
?></strong>

and it is generating a list and by css i want to add border to last item of list, but problem is that whenever i add css border to last item , it is applied to all list items ,,,, so can you guys give me code how to do that