gistfile1.aw

<?php $tombstones = new WP_Query('category_name=tombstones&posts_per_page=-1&order=ASC'); ?>
<?php $counter = 0; ?>
<?php echo '<div class="slide">'; ?>
<?php  if( $tombstones->have_posts() ) : while ( $tombstones->have_posts() ) : ?>
<?php $tombstones->the_post(); $counter++; ?>
<?php if ($counter % 3 == 0) echo '</div><div class="slide">'; ?>
<?php the_content(); ?>
<?php endwhile; endif;?>
<?php echo '</div>'; ?>
<?php wp_reset_postdata(); ?>
</div><!-- end slideshow -->