function showBigPhoto(photo_url, title){
  document.getElementById('photo-big-sourse').innerHTML = '<img src="' + photo_url + '" />';
  document.getElementById('phot_title').innerHTML = title;
  document.getElementById('photo-big').style.display = '';
}

function closeBigPhoto(){
  document.getElementById('photo-big').style.display = 'none';
  
}