function showPicturePopup(url, width, height) {
  max_width = 1024;
  max_height = 800;
  width = (width <= max_width) ? width : max_width;
  height = (height <= max_height) ? height : max_height;
  window.open(url, 'full_view', 'width='+width+', height='+height+', resizable=1, status=0, scrollbars=1');
}