_photo_album.html.erb

<ul class='photos'>
  <% plugin_module.photos.each do |photo| -%>
    <li>
      <%= link_to image_tag(photo.photo_album_photo_image.url(:thumb)),
                  photo.photo_album_photo_image.url(:large), 
                  :rel   => "lightbox[#{plugin_module.id}]",
                  :title => "<h2>#{photo.title}</h2>#{photo.caption}"
      -%>
    </li>
  <% end -%>
</ul>