Displaying Multiple categories — Partially solved!

the following will bring up posts from Category ID 6
then display all the posts which also have category ID 7

How can I display the posts associated with category ID 8,9,10 ect?

below my current category…

I’ve tried rewind posts, but that didnt seem to work.

also Ideally I’d like to replace my <h2>Category<h2> with the current categoy name in the loop…if thats possible

I’m not sure if this is clear

<?php
 if (is_page('3') ) {
$cat = array(6);
} else {
$cat = '';
}

$showposts = -1; // -1 shows all posts
$do_not_show_stickies = 1; // 0 to show stickies
$args=array(
   'category__in' => $cat,
   'showposts' => $showposts,
   'caller_get_posts' => $do_not_show_stickies
   );
$my_query = new WP_Query($args); 

?>
		<div id="colLeft">
<h2>Category</h2>
	<?php if( $my_query->have_posts() ) : ?>

		<?php while ($my_query->have_posts()) : $my_query->the_post(); ?>
 		<?php if ( in_category('7') ) { ?>

			 <div class="boxgrid thecombo">
				<img src="<?php bloginfo('template_directory'); ?>/timthumb.php?src=<?php echo get_post_meta($post->ID, "largethumb", $single = true); ?>&h=300&w=300&zc=1" alt="<?php the_title(); ?>" width="300" height="300" class="cover" />

					<p><a href="<?php the_permalink() ?>" class="lightbox title"><?php the_title(); ?></a></p>

					<p><a href="<?php the_permalink() ?>">Read more &raquo;</a></p>

			</div>
  <?php } ?>

		<?php endwhile; ?>

	<?php else : ?>

		<h2 class="center">Not Found</h2>
		<p class="center">Sorry, but you are looking for something that isn't here.</p>
		<?php get_search_form(); ?>

	<?php endif; ?>

	</div>

<?php get_sidebar(); ?>

<?php get_footer(); ?>