def djatoka_image_tag(rft_id, params={})
      url = djatoka_image_url(rft_id, params)
      image_tag url, clean_image_tag_params(params)
    end
def djatoka_image_tag(rft_id, params={})
      url = djatoka_image_url(rft_id, params)
      image_tag url, clean_image_tag_params(params)
    end
Returns an image_tag. Unless params are passed in which constrain the
 <tt>scale</tt> or <tt>level</tt> of the image, this will be the highest
 resolution of the given image.
   djatoka_image_tag('info:lanl-repo/ds/5aa182c2-c092-4596-af6e-e95d2e263de3',
     {:scale => 150, :class => 'djatoka_image'})

   djatoka_image_tag('info:lanl-repo/ds/5aa182c2-c092-4596-af6e-e95d2e263de3',
      {:scale => 150, :region => [1400,500,1400,1500], :class => 'volleyball'})