divider bar for each post

i am have a random divider bar for each post( islandcastaway.com/log/index.php ) but i would like it to show just between the days, not every post. my index.php is :

<?php
get_header();
?>
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

<div class=”post” id=”post-<?php the_ID(); ?>”>

<?php the_date(”,’Captains Log Sea date ‘,”); ?> </h3><?php edit_post_link(__(‘Edit This’)); ?>
</div>
<div class=”storycontent”>
<?php the_content(__(‘(more…)’)); ?>
</div>
<div class=”feedback”>
<?php wp_link_pages(); ?>
<?php comments_popup_link(__(‘Comments (0)’), __(‘Comments (1)’), __(‘Comments (%)’)); ?>
</div>
</div>

<img class=”logo” src=”<?php echo c2c_random_file(‘../clipart/bars/’); ?>” />

<?php comments_template(); // Get wp-comments.php template ?>
<?php endwhile; else: ?>

<?php _e(‘Sorry, no posts matched your criteria.’); ?>

<?php endif; ?>
<?php posts_nav_link(‘ — ‘, __(‘? Previous Page’), __(‘Next Page ?’)); ?>
<?php get_footer(); ?>

how can i get this to just be once a day

<img class=”logo” src=”<?php echo c2c_random_file(‘../clipart/bars/’); ?>” />