Help with query_posts

Hello,

I am trying to create a home page in which there is block of text at the beginning. This block of text should display the content of a specific page. The rest of the home page should display as usual. For example:

+--------------------------------------------+
|                 HEADER                     |
+--------------------------------------------+
|              block of text                 |
|    displays content of page_id = 8         |
+--------------------------------------------+
|                  index.php                 |
|          displays rest of the posts        |
|             as an out-of-the-box           |
|                  install                   |
+--------------------------------------------+
|                   footer                   |
+--------------------------------------------+

Im am using this in the block of text to display page_id 8 content:

<?php query_posts($query_string . "&page_id=8"); ?>
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

   <div class="entry">

      <?php the_content('<p class="serif">Leer más &raquo;
'); ?>

   </div>

<?php endwhile; endif; ?>
<?php rewind_posts(); ?>

and then, in index:

<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>
...usual stuff...
<?php endif; ?>
<?php endwhile; ?>

This does not work because, even though page content is correctly shown in the block of text, page_id 8 content gets duplicated below, in the index section, and nothing else shows.

Any ideas how to do this ?

Thanks