Showing Full Article On Main Page with theme r755 light

Dear readers,
I am new with wordpress, but it runs, I installed the theme r755_light (http://www.varometro.net/blog/r755_light_theme/) and cannot resolve this problem: the new template shows summaries of the posts on the main page instead of the full post. I want to presen the newest post in full and not just a summary on the homepage.

This is my blog URL: http://klischka.de/blog/

And this is the code for the index:

<?php get_header(); ?>
<div id="contentWrapper">
  <?php get_sidebar(); ?>
  <div id="content">
  <?php query_posts('showposts=5'); ?>
    <?php if (have_posts()) : while (have_posts()) : the_post(); ?>
    <div <?php post_class() ?> id="post-<?php the_ID(); ?>">
      <h2 class="posttitle"><a href="<?php the_permalink(); ?>" rel="bookmark" title="<?php printf(__('Permanent Link to %s', 'r755_light'), the_title_attribute('echo=0')); ?>">
        <?php the_title(); ?>
        </a></h2>
      <div class="postinfo">
        <?php the_time(__('l j M Y', 'r755_light')) ?>
        <?php _e('by','r755_light');?>
        <?php the_author(); ?>
        | <strong><a href="<?php comments_link(); ?>">
        <?php comments_number(__('No Comments','r755_light'), __('1 Comment','r755_light'), __('% Comments','r755_light'), '', __('Comments off','r755_light')); ?>
        </a></strong>
        <?php edit_post_link(__('Edit','r755_light'), '[ ', ' ]'); ?>
        <br />
        <?php _e('Filed under:','r755_light');?>
        <?php the_category(', '); ?>
        <?php the_tags(__('Tags:', 'r755_light') . ' ', ', ', '<br />'); ?>
      </div>
      <div class="entry">
        <?php the_content(__('Read the rest of this entry &raquo;', 'r755_light')); ?>
      </div>
    </div>
    <?php endwhile; ?>
	<?php if(function_exists('wp_page_numbers')) : ?>
	<?php wp_page_numbers() ?>
    <?php else : ?>
    <div class="alignleft">
      <?php next_posts_link(__('&laquo; Older Entries', 'r755_light')) ?>
    </div>
    <div class="alignright">
      <?php previous_posts_link(__('Newer Entries &raquo;', 'r755_light')) ?>
    </div>
    <br />
    <?php endif; ?>
    <?php else: ?>
    <h2><?php _e('Not Found', 'r755_light'); ?></h2>
    <p><?php _e('Sorry, but you are looking for something that isn’t here.', 'r755_light'); ?></p>
    <?php endif; ?>
  </div>
  <br class="clearFloat" />
</div>
<?php get_footer(); ?>

Could someone please help me and tell me how to fix this so that on my homepage, it shows 5 full posts and not just the summaries?

Thank you a lot!