if (document.images) {
  image1on = new Image();
    image1on.src = "images/roll_aboutus_on.jpg";
  image1off = new Image();
    image1off.src = "images/roll_aboutus_off.jpg";
  image2on = new Image();
    image2on.src = "images/roll_products_on.jpg";
  image2off = new Image();
    image2off.src = "images/roll_products_off.jpg";
  image3on = new Image();
    image3on.src = "images/roll_services_on.jpg";
  image3off = new Image();
    image3off.src = "images/roll_services_off.jpg";
  image4on = new Image();
    image4on.src = "images/roll_contact_on.jpg";
  image4off = new Image();
    image4off.src = "images/roll_contact_off.jpg";
  image5on = new Image();
    image5on.src = "images/roll_news_on.jpg";
  image5off = new Image();
    image5off.src = "images/roll_news_off.jpg";		
}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}