Help limiting posts on homepage

Thanks in advance for help with this.

I know how to use the WordPress settings to limit the posts per page. I have my categories display 20 posts.

However, I want my homepage to only show 10 posts. I have tried to modify my template, but am new with WordPress and have not had success.

Here is part of my homepage code:

<div class="archiveposts">

	<h3><?php _e('Recent Articles', 'wpzoom'); ?></h3>
	<div class="rounded">
		<?php $z = count($wpzoom_exclude_cats_home);if ($z > 0) {
			$x = 0; $que = ""; while ($x < $z) {
			$que .= "-".$wpzoom_exclude_cats_home[$x]; $x++;
			if ($x < $z) {$que .= ",";} } }
			query_posts($query_string . "&cat=$que");if (have_posts()) :
		?>

			<?php while ($wp_query->have_posts()) : $wp_query->the_post(); ?>
		<div class="post">

			<?php if ($wpzoom_homepost_thumb == 'Show') { unset($img);
			if ( current_theme_supports( 'post-thumbnails' ) && has_post_thumbnail() ) {
				$thumbURL = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), '' );
				$img = $thumbURL[0];  }
				else {
					unset($img);
					if ($wpzoom_cf_use == 'Yes')  { $img = get_post_meta($post->ID, $wpzoom_cf_photo, true); }
				else {
					if (!$img)  {  $img = catch_that_image($post->ID);  } }
				}
				if ($img) { $img = wpzoom_wpmu($img); ?>
				<a>" rel="bookmark" title="<?php the_title(); ?>"><img src="<?php bloginfo('template_directory'); ?>/scripts/timthumb.php?src=<?php echo $img ?>&w=<?php echo "$wpzoom_homepost_thumb_width";?>&h=<?php echo "$wpzoom_homepost_thumb_height";?>&zc=1" alt="<?php the_title(); ?>" /></a><?php }
				} ?>

			<h2><a>" title="<?php the_title(); ?>"><?php the_title(); ?></a></h2><?php if ($wpzoom_homepost_comm  == 'Show') { ?><span class="comm_bubble"><?php comments_popup_link('0', '1', '%', ' ', ' '); ?></span><?php } ?>
			<span class="meta"><?php if ($wpzoom_homepost_auth  == 'Show') { ?><?php the_author_posts_link(); ?><?php } ?> <?php if ($wpzoom_homepost_date == 'Show') { ?>/ <?php the_time("$dateformat $timeformat"); ?><?php } ?> <?php edit_post_link( __('Edit', 'wpzoom'), ' ', ''); ?></span>

			<?php the_excerpt(); ?>
		</div>

		<?php endwhile; ?>

		<?php endif; ?>
		<?php wp_reset_query(); ?>
	 </div> <!-- /rounded -->
</div> <!-- /archive -->

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