Archive with monthly list for one category

I have a page (category-news.php) that displays all posts from category 1 (news).
In the left column i want to display a list with monthly archive, for this category.

To display the month list, i use this code:
<?php wp_get_archives('type=monthly'); ?>

And for the posts, this loop:

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

                <div class="right">

                    <h2><?php echo the_title(); ?> (<?php echo the_date(); ?>)</h2><span class="edit"><?php edit_post_link('EDIT'); ?></span>
                    <h3>Posted by <?php echo the_author(); ?></h3>
                    <div class="entry"><?php the_content(); ?></div>
                </div> <!-- right -->

        <?php endwhile; ?>

            <div class="navigation">
                <div class="alignleft"><?php next_posts_link('&laquo; Older Entries') ?></div>
                <div class="alignright"><?php previous_posts_link('Newer Entries &raquo;') ?></div>
            </div>

        <?php else : ?>

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

        <?php endif; ?>

The problems
1. The month list displays months when there is nothing written in this category, but in others.

2. When clicking on a month, i get posts from all categories.
Well, I figured I had to put this before the loop in archive.php:
<?php query_posts('category_name=news'); ?>

With that code, I get the correct category – but I see posts from all moths, even if I click on a specific moth and the url is ending with ?m=200911

Anyone? Thanks.