if (document.images) {
	var image1on = new Image();
	image1on.src = "/images/n_product_on.jpg";

	var image2on = new Image();
	image2on.src = "/images/n_about_on.jpg";

	var image3on = new Image();
	image3on.src = "/images/n_contact_on.jpg";

	var image4on = new Image();
	image4on.src = "/images/n_home_on.jpg";
	
	var image1off = new Image();
	image1off.src = "/images/n_product_off.jpg";

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

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

	var image4off = new Image();
	image4off.src = "/images/n_home_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");
    }
  }
}