function image() {
};

image = new image();
number = 0;
// imageArray
image[number++] = "<img src='photo/summer/fiore-catinaccio.jpg' >"
image[number++] = "<img src='photo/summer/ghiacciaio-della-marmolada.jpg' >"
image[number++] = "<img src='photo/summer/gruppo-del-catinaccio.jpg' >"
image[number++] = "<img src='photo/summer/pigna.jpg' >"
image[number++] = "<img src='photo/summer/torri-del-vajolet.jpg' >"

increment = Math.floor(Math.random() * number);