<?php
			global $post;
			$myposts = get_posts('numberposts=6&category=3&orderby=rand');
			foreach($myposts as $post) :
			setup_postdata($post); ?>

					<?php
					global $more;
					$more = 0;
					?>

			<div class="postboxmain" id="post-<?php the_ID(); ?>">
			REST OF YOUR POST TEMPLATE HERE
			</div>

			<?php endforeach; 
			wp_reset_query(); 
			?>