Post listing within a post

On the right hand side of my blog I want an image listing of each and every post (I’ve added the images etc..)

The below code works great, IF it is on the homepage.

<?php if (have_posts()) : ?>
  <?php while (have_posts()) : the_post(); ?>
    <?php if(get_post_meta($post->ID, "small-image", true)) : ?>
      <a href="<?php the_permalink(); ?>" class="thumbnail"><img src="<?php echo get_post_meta($post->ID, "small-image", true); ?>" /></a>
    <?php endif; ?>
  <?php endwhile; ?>
<?php endif; ?>

When this code is on any specific blog post it will only find the image for the current post.

What is the post call that I need to use for it to act like it is starting at the root of my site?

Thanks!