if (document.images) {
  homeon = new Image(); homeon.src = "images/homeon.jpg"; homeoff = new Image(); homeoff.src = "images/home.jpg";
  contacton = new Image(); contacton.src = "images/contacton.jpg"; contactoff = new Image(); contactoff.src = "images/contact.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");
    }
  }
}
function clearField(object) {
object.value ="";
}