function preload() {
  if (!document.images) return;
  var wl = new Array();
  var arguments = preload.arguments;
  for (var i = 0; i < arguments.length; i++) {
    wl[i] = new Image();
    wl[i].src = arguments[i];
  }
}




function chi_on(url) {
	document.images[8].src=url
}
function chi_off(url) {
	document.images[8].src=url
	}
function fotochi_on(url) {
	document.images[15].src=url
}
function fotochi_off(url) {
	document.images[15].src=url
}


function bio_on(url) {
	document.images[10].src=url
}
function bio_off(url) {
	document.images[10].src=url
}
function fotobio_on(url) {
	document.images[18].src=url
}
function fotobio_off(url) {
	document.images[18].src=url
}



function cd_on(url) {
	document.images[12].src=url
}
function cd_off(url) {
	document.images[12].src=url
}
function fotocd_on(url) {
	document.images[21].src=url
}
function fotocd_off(url) {
	document.images[21].src=url
}



function contatti_on(url) {
	document.images[14].src=url
}
function contatti_off(url) {
	document.images[14].src=url
}
function fotocontatti_on(url) {
	document.images[24].src=url
}
function fotocontatti_off(url) {
	document.images[24].src=url
}