if (document.images) {

var menu1eon = new Image();
menu1eon.src = "parts/menu1eon.jpg";
var menu1eoff = new Image();
menu1eoff.src = "parts/menu1e.jpg";

var menu2eon = new Image();
menu2eon.src = "parts/menu2eon.jpg";
var menu2eoff = new Image();
menu2eoff.src = "parts/menu2e.jpg";

var menu1on = new Image();
menu1on.src = "parts/menu1on.jpg";
var menu1off = new Image();
menu1off.src = "parts/menu1.jpg";

var menu2on = new Image();
menu2on.src = "parts/menu2on.jpg";
var menu2off = new Image();
menu2off.src = "parts/menu2.jpg";

var menu3on = new Image();
menu3on.src = "parts/menu3on.jpg";
var menu3off = new Image();
menu3off.src = "parts/menu3.jpg";

var menu4on = new Image();
menu4on.src = "parts/menu4on.jpg";
var menu4off = new Image();
menu4off.src = "parts/menu4.jpg";

var menu5on = new Image();
menu5on.src = "parts/menu5on.jpg";
var menu5off = new Image();
menu5off.src = "parts/menu5.jpg";

}

function On(name) {
  if (document.images) {
    document.images[name].src = eval(name + 'on.src');
  }
}

function Off(name) {
  if (document.images) {
    document.images[name].src = eval(name + 'off.src');
  }
}