Different archive for 1 category

this is my current archive page, it shows excerpts which is great however when i want to view my books category which is id#3 i want it to show the whole post so i want to use the_content rather then the_excerpt so how can i change it to do so…

<?php get_header(); ?>
<div id="content">
<?php if (have_posts()) : ?>
<?php $post = $posts[0]; // Hack. Set $post so that the_date() works. ?>
<?php /* If this is a category archive */ if (is_category()) { ?><h2 class="title"><?php single_cat_title(); ?> </h2>
<?php /* If this is a tagged archive */ } elseif (is_tag()) { ?>
<h2 class="title">Tagged with: <?php single_tag_title(); ?></h2>
<?php /* If this is a daily archive */ } elseif (is_day()) { ?>	<h2 class="title">Archive for <?php the_time('j F Y'); ?></h2>
<?php /* If this is a monthly archive */ } elseif (is_month()) { ?><h2 class="title">Archive for <?php the_time('F Y'); ?></h2>
<?php /* If this is a yearly archive */ } elseif (is_year()) { ?>
<h2 class="title">Archive for Year <?php the_time('Y'); ?></h2>
<?php /* If this is a paged archive */ } elseif (isset($_GET['paged']) && !empty($_GET['paged'])) { ?>
	<h2 class="title">The Archives</h2>
 	 <?php } ?>

	<div id="archive">

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

			<div class="clearfloat">

	<div class="title"><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></div>
	<div class="meta">[<?php the_time('j M Y') ?> | <?php comments_popup_link('No Comment', 'One Comment', '% Comments');?> | <?php if(function_exists('the_views')) { the_views(); } ?>]</div>
<div class="spoiler">
<?php the_excerpt(); ?>
	</div>
	</div>
	<?php endwhile; ?>
	<div class="navigation">
	<?php if(function_exists('wp_pagenavi')) { wp_pagenavi(); }
			else { ?>
			<div class="right"><?php next_posts_link('Next Page &raquo;') ?></div>
			<div class="left"><?php previous_posts_link('&laquo; Previous Page') ?></div>
			<?php } ?>
	</div>
	<?php else : ?>
	<h2 class="title">No posts found. Try a different search?</h2>
	<?php endif; ?>
	</div>
	</div>
<?php get_sidebar(); ?>
<?php get_footer(); ?>