function maximize (image) {
  document.getElementById("viewer").className = "viewer";
  document.getElementById("photo").className = "viewer-photo";
  document.getElementById("photo").src = "images/" + image;
}

function maximize_small (image) {
  document.getElementById("viewer").className = "viewer";
  document.getElementById("photo").className = "viewer-photo-2";
  document.getElementById("photo").src = "images/" + image;
}

function close_img () {
  document.getElementById("viewer").className = "viewer-invisible";
  document.getElementById("photo").className = "viewer-invisible";
}


function hover (img) {
  document.getElementById(img).className = "image-hover";
}

function hover_off (img) {
  document.getElementById(img).className = "image";
}