if (document.images)  {

sustainabilityON = new Image(110,20);
sustainabilityON.src = "images/menu/sustainabilityOn.jpg";
sustainabilityOFF = new Image(110,20);
sustainabilityOFF.src = "images/menu/sustainability.jpg";

aboutusON = new Image(76,20);
aboutusON.src = "images/menu/statements_menuON_07.gif";
aboutusOFF = new Image(76,20);
aboutusOFF.src = "images/menu/statements_menu_07.gif";

contactON = new Image(70,20);
contactON.src = "images/menu/contactOn.jpg";
contactOFF = new Image(70,20);
contactOFF.src = "images/menu/contact.jpg";

ciaoON = new Image(40,20);
ciaoON.src = "images/menu/ciaoOn.jpg";
ciaoOFF = new Image(40,20);
ciaoOFF.src = "images/menu/ciao.jpg";

}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}

function b() {
  if (document.images) {
    for (var i=0; i<b.arguments.length; i+=2) {
      document[b.arguments[i]].src = eval(b.arguments[i+1] + ".src");
    }
  }
}