function afficher_image(img)
{
  document.getElementById('page').style.visibility = 'hidden';
  document.getElementById('image').innerHTML = '<img src="./images/' + img + '"></img>';
  document.getElementById('cadre').style.visibility = 'visible';
  return false;
}

function cacher_image()
{
  document.getElementById('cadre').style.visibility = 'hidden';
  document.getElementById('image').innerHTML = '';
  document.getElementById('page').style.visibility = 'visible';
  return false;
}

function change_photo(photo)
{
  document.getElementById('photo').innerHTML = '<img src="./images/' + photo + '.jpg" style=" height:550px; width:550px;"></img>';
}