use category slug as css class-name

hi there!

i’ve been trying for a couple of days now to query posts from 3 categories on my website and display them with different color for each category…

logitune.fm is the website and I’m trying to build a scrolling div with all the posts from the HOUSE BASS and LOUNGE categories… and i need to display them with their specific color

something like:

<div class=”<?php echo $category-slug(); ?>” >
<?php query_posts(‘cat=4,5,6’); ?>
<?php while (have_posts()) : the_post(); ?>
” rel=”bookmark” title=”<?php the_title(); ?>”><?php the_title(); ?>
<?php if(get_post_meta($post->ID, “image_value”, true)) : ?>
<?php endif; ?>
<?php the_tags(); ?>

<?php endwhile; ?>
</div>

any idea if that’s possible? or any other idea on how to do that?

thanks
Bogdan