How to add sidebar according to category wise in wordpress

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

	<div id="content">

		<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
		<div class="post" id="post-<?php the_ID(); ?>">
		<h2><?php the_title(); ?></h2>
			<div class="entry">
				<?php the_content('<p class="serif">Read the rest of this page &raquo;</p>'); ?>

				<?php wp_link_pages(array('before' => '<p><strong>Pages:</strong> ', 'after' => '</p>', 'next_or_number' => 'number')); ?>

			</div>
				<?php edit_post_link('Edit this entry.', '<p>', '</p>'); ?>
		</div>
		<?php endwhile; endif; ?>
	</div>

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

<?php get_footer(); ?>

Page wise according to category 

<?php if ( is_page('about')) { ?>
   <ul>
   <?php wp_list_cats('exclude=4, 5, 6, 7, 8'); ?>
   </ul>
<?php } elseif ( is_page('gallery')) { ?>
   <ul>
   <?php wp_list_cats('exclude=1, 2, 3, 7, 8'); ?>
   </ul>
<?php } else {  ?>
   <ul>
   <?php wp_list_cats('exclude=1, 2, 3, 4, 5, 6'); ?>
   </ul>
<?php }	 ?>