if (document.images) {            // Active Images            img1on = new Image();            img1on.src = "pulsanti/home1.jpg";            img2on = new Image();            img2on.src = "pulsanti/book1.jpg";            img3on = new Image();            img3on.src = "pulsanti/marble1.jpg";            img4on = new Image();            img4on.src = "pulsanti/stat1.jpg";            img5on = new Image();            img5on.src = "pulsanti/libri1.jpg";            img6on = new Image();            img6on.src = "pulsanti/carta1.jpg";            img7on = new Image();            img7on.src = "pulsanti/oggetti1.jpg";            img8on = new Image();            img8on.src = "pulsanti/top1.jpg";            img9on = new Image();            img9on.src = "pulsanti/su1.jpg";            img1off = new Image();            img1off.src = "pulsanti/home0.jpg";            img2off = new Image();            img2off.src = "pulsanti/book0.jpg";            img3off = new Image();            img3off.src = "pulsanti/marble0.jpg";            img4off = new Image();             img4off.src = "pulsanti/stat0.jpg";            img5off = new Image();            img5off.src = "pulsanti/libri0.jpg";             img6off = new Image();            img6off.src = "pulsanti/carta0.jpg";             img7off = new Image();            img7off.src = "pulsanti/oggetti0.jpg";            img8off = new Image();            img8off.src = "pulsanti/top0.jpg";            img9off = new Image();            img9off.src = "pulsanti/su0.jpg";        }// Function to 'activate' images.function imgOn(imgName) {        if (document.images) {            document[imgName].src = eval(imgName + "on.src");        }}// Function to 'deactivate' images.function imgOff(imgName) {        if (document.images) {            document[imgName].src = eval(imgName + "off.src");        }}