Where do i put my adsense code to display above and below post on Wordpress theme?

Hi
I want to customise my post template to automatically put my adsense code on every post, above and below the post. I have tried putting the code in several different places, its not working. Can anyone help. This is the coding of the blog page template:

<?php
/*
Template Name: Blog
*/
?>

<?php get_header(); ?>

<div id="content">

<div id="contentleft">

<div class="postarea">

<?php include(TEMPLATEPATH."/breadcrumb.php");?>

<?php $blog_cat_1 = get_option('church_blog_cat_1'); $blog_cat_1_num = get_option('church_blog_cat_1_num'); if(!$blog_cat_1) $blog_cat_1 = 1; //setting a default ?>

<?php $page = (get_query_var('paged')) ? get_query_var('paged') : 1; query_posts("cat=".$blog_cat_1."&showposts=".$blog_cat_1_num."&paged=$page"); while ( have_posts() ) : the_post() ?>

<h1><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h1>

<div class="date">

<div class="dateleft">
<p><span class="time"><?php the_time('F j, Y'); ?></span> by <?php the_author_posts_link(); ?> &nbsp;<?php edit_post_link('(Edit)', '', ''); ?> <br /> Filed under <?php the_category(', ') ?></p>
</div>

<div class="dateright">
<p><span class="icomment"><a href="<?php the_permalink(); ?>#comments"><?php comments_number('Leave a Comment', '1 Comment', '% Comments'); ?></a></span></p>
</div>

</div>

<?php the_content(__('[Read more]'));?><div style="clear:both;"></div>

<div class="postmeta2">
Filed Under: <?php the_category(', ') ?><br />Tagged: <?php the_tags('') ?>
</div>

<?php endwhile; ?>

<p><?php posts_nav_link(); ?></p>

</div>

</div>

<?php include(TEMPLATEPATH."/sidebar.php");?>

</div>

<!-- The main column ends -->

<?php get_footer(); ?>