$(document).ready(
   function() {
      $('.section-gallery-primary-image').attr('style', 'display:none');
      $('#section-gallery-primary-image-0').attr('style', 'display:block');

      $('.section-gallery-thumbnail').hover(
         function() {
            $key = $(this).attr('id').substr(26);

            $('.section-gallery-primary-image').attr('style', 'display:none');
            $('#section-gallery-primary-image-' + $key).attr('style', 'display:block');
         },
         function() {
         }
      );
   }
);