dynamic menu created with query_post of a single category

I have posts that, of a single category,that I wish to use for a sub navigation when viewing one of those post. Which the code below works. However, I wish to style the links with css class current_item or page_item. current_item being for the current post being view and the opposite for the other post links. Another problem that I noticed, is when my only other category {1} is being view as a single page, it still generates the links. Not really that big of a problem. I have the following code placed in my single.php file.

‘<?php $cat_posts = new WP_Query(“cat=3”); ?>
<div id=”subnav”>
<ul class=”subnav”>
<?php if($cat_posts->have_posts()) : ?><?php while($cat_posts->have_posts()) : $cat_posts->the_post(); ?>

<li class=”<?php if (is_single()) { ?>current_item<?php } else { ?>page_item<?php } ?>”>/<?php echo $post->post_name; ?>/” title=”<?php the_title(); ?>”><?php the_title(); ?>

<?php endwhile; ?>

<?php endif; ?>
</div>

<?php wp_reset_query(); ?>`
Which returns all links as current_item

I tried also tried the plain
‘<?php query_posts(“cat=3,-1”);’
to remove this sub navigation from category one.

I really want to stay away from hand coding the links and plugins, If there is an easier way, please let me know. Thanks in advance for any help!