if (document.images) {
    mnuProducts_on = new Image(128, 27);
    mnuProducts_on.src = "/images/menu_on.gif";

    mnuProducts_off = new Image(128, 27);
    mnuProducts_off.src = "/images/menu_off.gif";

    mnuContact_on = new Image(128, 27);
    mnuContact_on.src = "/images/menu_on.gif";

    mnuContact_off = new Image(128, 27);
    mnuContact_off.src = "/images/menu_off.gif";

    mnuDealers_on = new Image(128, 27);
    mnuDealers_on.src = "/images/menu_on.gif";

    mnuDealers_off = new Image(128, 27);
    mnuDealers_off.src = "/images/menu_off.gif";

    mnuBasicElectronics_on = new Image(128, 27);
    mnuBasicElectronics_on.src = "/images/menu_on.gif";

    mnuBasicElectronics_off = new Image(128, 27);
    mnuBasicElectronics_off.src = "/images/menu_off.gif";

    mnuLinks_on = new Image(128, 27);
    mnuLinks_on.src = "/images/menu_on.gif";

    mnuLinks_off = new Image(128, 27);
    mnuLinks_off.src = "/images/menu_off.gif";
  }

function turnOn(imageName) {
  if (document.images) {
    document[imageName].src = eval(imageName + "_on.src");
  }
}

function turnOff(imageName) {
  if (document.images) {
    document[imageName].src = eval(imageName + "_off.src");
  }
}