if (document.images) {
  image1on = new Image();
  image1on.src = "images/home-on.jpg";

  image2on = new Image();
  image2on.src = "images/srp-on.jpg";

  image3on = new Image();
  image3on.src = "images/schol-on.jpg";

  image4on = new Image();
  image4on.src = "images/prog-on.jpg";

  image5on = new Image();
  image5on.src = "images/conf-on.jpg";

  image6on = new Image();
  image6on.src = "images/prof-on.jpg";

  image7on = new Image();
  image7on.src = "images/staff-on.jpg";

  image1off = new Image();
  image1off.src = "images/home.jpg";

  image2off = new Image();
  image2off.src = "images/srp.jpg";

  image3off = new Image();
  image3off.src = "images/schol.jpg";

  image4off = new Image();
  image4off.src = "images/prog.jpg";

  image5off = new Image();
  image5off.src = "images/conf.jpg";

  image6off = new Image();
  image6off.src = "images/prof.jpg";

  image7off = new Image();
  image7off.src = "images/staff.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");
    }
  }
}