if (document.images) {
  image1on = new Image();
  image1on.src = "./images/homeon.gif";
  image1off = new Image();
  image1off.src = "./images/homeoff.gif";

  image2on = new Image();
  image2on.src = "./images/abouton.gif";
  image2off = new Image();
  image2off.src = "./images/aboutoff.gif";

  image3on = new Image();
  image3on.src = "./images/serviceson.gif";
  image3off = new Image();
  image3off.src = "./images/servicesoff.gif";

  image4on = new Image();
  image4on.src = "./images/portfolioon.gif";
  image4off = new Image();
  image4off.src = "./images/portfoliooff.gif";

  image5on = new Image();
  image5on.src = "./images/emailon.gif";
  image5off = new Image();
  image5off.src = "./images/emailoff.gif";

  image6on = new Image();
  image6on.src = "./images/emailon2.gif";
  image6off = new Image();
  image6off.src = "./images/emailoff2.gif";

  image7on = new Image();
  image7on.src = "./images/contacton.gif";
  image7off = new Image();
  image7off.src = "./images/contactoff.gif";
}

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");
    }
  }
}