var indice = 1;

function load_image_array() {
	aImage = new Array(2);
	for (i = 0; i< 2; i++) {
		aImage[i] = new Image();
	}
	aImage[0].src = "immagini/cartina.gif";
	aImage[1].src = "immagini/cartina_zoom.gif";
}

function load_image() {
	   document.images[1].src = aImage[indice].src;
	   indice++;
	   if (indice == 2)
		indice = 0;
	   
}

load_image_array();