show child categories on archive pages

how i can list the child categories on my category archive pages (http://castilloleathergoods.com/wordpress/category/hard-cue-cases/), right below where it says "Category: 'Parent Category Name'"

????

here's the current code from my archive.php file:

<div class="posttitle">
		<?php if (have_posts()) : ?>
		<?php $post = $posts[0]; ?>
		<?php if (is_category()) { ?><h2>Category: '<?php echo single_cat_title(); ?>'</h2>
		<?php } elseif (is_day()) { ?><h2>Archive for <?php the_time('F jS, Y'); ?></h2>
		<?php } elseif (is_month()) { ?><h2>Archive for <?php the_time('F, Y'); ?></h2>
		<?php } elseif (is_year()) { ?><h2>Archive for the year <?php the_time('Y'); ?></h2>
		<?php } elseif (is_tag()) { ?><h2>Tag: <?php single_tag_title(''); ?></h2>
		<?php } elseif (is_search()) { ?><h2>Search results</h2>
		<?php } elseif (isset($_GET['paged']) && !empty($_GET['paged'])) { ?><h2>Archives</h2>
		<?php } ?>
	</div>

PHP:

 

<?php // get current category
$this_category = get_category($cat);
?> 


<?php //show child category, fit it with your theme 
wp_list_categories('orderby=name&show_count=0&style=none&use_desc_for_title=0&title_li=&child_of='.$this_category->cat_ID);?>

PHP:

 

thanks strid3r. but i tried that and the archive pages didnt appear at all. it was just a completely blank space. i guess there's some error in that code you provided. please advise. thanks!

 

Did you place the code outside the loop ?
ahh, its only works if your category has childs.