<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>
   <ul>
     <li><a title="<?php the_title(); ?>" href="<?php the_permalink(); ?>"><?php the_title(); ?></a> <?php comments_number('(0)','(1)','(%)'); ?></li>
   </ul>
<?php endwhile; endif; ?>

<?php
function randomPosts() {
query_posts('orderby=rand&showposts=10');
if (have_posts()) : while (have_posts()) : the_post(); ?>
<ul>
<li><a title="<?php the_title(); ?>" href="<?php the_permalink(); ?>"><?php
$content = get_the_content();
$s=strpos($content,"<img src");
if ($s>0) echo substr($content,strpos($content,"<img src"),strpos($content,">",strpos($content,"<img src")) - strpos($content,"<img src") + 1);
else echo 'Нет картинки';
?></a></li>
</ul>
<?php endwhile; endif;
}
randomPosts();
?>