<?php if (have_posts()) : ?>
<?php $recent = new WP_Query("cat=5,4,12,51&showposts=10"); while($recent->have_posts()) : $recent->the_post();?>
<ul>
<li><a href="<?php the_permalink() ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></li>
</ul>
<?php endwhile; ?>
<?php else: ?>
<?php endif; ?>
</div>