if (document.images) { //if image object is available 
img1on = new Image(); // MouseOver Images
img1on.src = "img/menu/azienda_o.gif"; 
img2on = new Image();
img2on.src = "img/menu/prodotti_o.gif"; 
img3on = new Image();
img3on.src = "img/menu/contatti_o.gif";
img4on = new Image();
img4on.src = "img/menu/news_o.gif";
img5on = new Image();
img5on.src = "img/menu/marchi_o.gif";
img6on = new Image();
img6on.src = "img/menu/riservata_o.gif";
img7on = new Image();
img7on.src = "img/menu/corsi_o.gif";
img8on = new Image();
img8on.src = "img/menu/eCommerce_o.gif";
img9on = new Image();
img9on.src = "img/menu/VipCard_o.gif";
img1off = new Image(); // MouseOut Images
img1off.src = "img/menu/azienda.gif"; 
img2off = new Image(); 
img2off.src = "img/menu/prodotti.gif";
img3off = new Image();
img3off.src = "img/menu/contatti.gif";
img4off = new Image();
img4off.src = "img/menu/news.gif";
img5off = new Image();
img5off.src = "img/menu/marchi.gif";
img6off = new Image();
img6off.src = "img/menu/riservata.gif";
img7off = new Image();
img7off.src = "img/menu/corsi.gif";
img8off = new Image();
img8off.src = "img/menu/eCommerce.gif";
img9off = new Image();
img9off.src = "img/menu/VipCard.gif";
}
function imgOn(imgName) { if (document.images) {
document[imgName].src = eval(imgName + "on.src");// Added line!
}}
function imgOff(imgName) { if (document.images) {
document[imgName].src = eval(imgName + "off.src");
}}