<?php if(shopp('catalog','has-categories')): ?>
  <?php while(shopp('catalog','categories')): ?>
  <div class="product-block">
    <h2><a>"><?php shopp('category','name'); ?></a></h2>
    <a>"><?php if(shopp('category','has-images','type=image'))
      {
        shopp('category','image');
      }
    ?></a>
  </div>
  <?php endwhile; ?>
<?php endif; ?>