Need help for complex qurey syntax

Hey guys

i am trying to show latest post title(only) from particular category along with only one(1) image from those title

any one can help me to form this qurrey ?
below is current qurey

<div class="right">
		<?php $recent = new WP_Query("cat=15&showposts=5"); while($recent->have_posts()) : $recent->the_post();?>
<div class="archive">
		<div class="thumb"><a href="<?php the_permalink(); ?>"><?php dp_attachment_image($post->ID, 'thumbnail', 'alt="' . $post->post_title . '"'); ?></a></div>
		<h2><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>

		</div>
		<?php endwhile; ?>
	</div>