if (document.images) {

var pmenu1on = new Image();
pmenu1on.src = "parts/productbase1on.jpg";
var pmenu1off = new Image();
pmenu1off.src = "parts/productbase1.jpg";

var pmenu2on = new Image();
pmenu2on.src = "parts/productbase2on.jpg";
var pmenu2off = new Image();
pmenu2off.src = "parts/productbase2.jpg";

var pmenu3on = new Image();
pmenu3on.src = "parts/productbase3on.jpg";
var pmenu3off = new Image();
pmenu3off.src = "parts/productbase3.jpg";

var pmenu4on = new Image();
pmenu4on.src = "parts/productbase4on.jpg";
var pmenu4off = new Image();
pmenu4off.src = "parts/productbase4.jpg";

var pmenu5on = new Image();
pmenu5on.src = "parts/productbase5on.jpg";
var pmenu5off = new Image();
pmenu5off.src = "parts/productbase5.jpg";

var pmenu6on = new Image();
pmenu6on.src = "parts/productbase6on.jpg";
var pmenu6off = new Image();
pmenu6off.src = "parts/productbase6.jpg";

var pmenu7on = new Image();
pmenu7on.src = "parts/productbase7on.jpg";
var pmenu7off = new Image();
pmenu7off.src = "parts/productbase7.jpg";

var pmenu8on = new Image();
pmenu8on.src = "parts/productbase8on.jpg";
var pmenu8off = new Image();
pmenu8off.src = "parts/productbase8.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');
  }
}