if (document.images) {
buttonUp = new Image(); buttonUp.src = "http://www.webstore.it/perdarubia/img/menu_fondo.gif";
buttonDown = new Image(); buttonDown.src = "http://www.webstore.it/perdarubia/img/menu_fondo-act.gif";
}
function turn_off(cell) {
if (document.images != null) {
cell.style.backgroundImage = "url('" + buttonUp.src + "')";
}
}
function turn_on(cell) {
if (document.images != null) {
cell.style.backgroundImage = "url('" + buttonDown.src + "')";
}
}