function photo_album (photo) {
  var photos_num=13;
  var page_type='bio';
  var photo_current=parseInt(document.getElementById("photo_album_slider").getAttribute("data-photo_album_current"));
  if (photo=='prev' && photo_current==1) photo=photos_num;
  else if (photo=='prev' && photo_current>1) photo=photo_current-1;
  else if (photo=='next' && photo_current==photos_num) photo=1;
  else if (photo=='next' && photo_current<photos_num) photo=photo_current+1;
  if (photo!==photo_current && photo>0 && photo<=photos_num) {
    photo_current_div_id='photo_album_'+photo_current;
    document.getElementById(photo_current_div_id).style.display='none';
    photo_div_id='photo_album_'+photo;
    photo_element=document.getElementById(photo_div_id);
    if (photo_element.hasAttribute("data-src")==true) {
      photo_data_src=photo_element.getAttribute("data-src");
      photo_element.srcset=photo_data_src;
      photo_element.removeAttribute("data-src");
    }
    document.getElementById(photo_div_id).style.display = 'block';
    document.getElementById("photo_album_slider").setAttribute("data-photo_album_current", photo);
    if (page_type!=='bio') {
      photo_current_preview_div_id='photo_preview_'+photo_current;
      document.getElementById(photo_current_preview_div_id).className='cursor_pointer';
      photo_preview_div_id='photo_preview_'+photo;
      document.getElementById(photo_preview_div_id).className='active';
    }
  }
}
document.getElementById("photo_album_1").srcset=document.getElementById("photo_album_1").getAttribute("data-src");
document.getElementById("photo_album_1").style.width="auto";
document.getElementById("photo_album_1").style.height="auto";