Need help stopping code from repeating

[Coryan]

I am using WordPress with a custom theme to write a blog.  I just set it up and added Google Adsense advertising to appear at the end of my posts.  However, I only want the ads to appear at the end of the first post.  How do I change the code so that the ads do not repeat on each post?

 

Here is the relevant section of code:

 

<?php if (have_posts()) : ?>

 

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

 

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

  <div class="date"><span><?php the_time('M') ?></span> <?php the_time('d') ?></div>

  <div class="title">

          <h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a></h2><p class="submeta">By <strong><?php the_author(); ?></strong>

          <div class="postdata"><span class="category"><?php the_category(', ') ?></span>  <span class="comments"><?php comments_popup_link('No Comments &#187;', '1 Comment &#187;', '% Comments &#187;'); ?></span></div>

  </div>

          <div class="entry">

            <?php the_content('Continue reading »'); ?>

 

<?php adsensem_ad('midpost468x60'); ?>         

           

<?php if(function_exists(�the_tags�)) the_tags('\\\\ tags: ', ', ', '<br />'); ?>

        </p>

 

          </div><!--/entry -->

        </div><!--/post -->

 

<?php endwhile; ?>

 

I have never used php, but I follow instructions well.  The adsense code <?php adsensem_ad('midpost468x60'); ?> was provided by a plugin.  Again, the ads are appearing without a problem, but I need to limit them to only the first ad.  You can see the page at www.uturnahead.com.

 

Thank you in advance for any assistance you can offer.