if (document.images) {
  image0on = new Image();
  image0on.src = "/images/nav_00b.gif";
  image0off = new Image();
  image0off.src = "/images/nav_00a.gif";

  image1on = new Image();
  image1on.src = "/images/nav_01b.gif";
  image1off = new Image();
  image1off.src = "/images/nav_01a.gif";
  
  image2on = new Image();
  image2on.src = "/images/nav_02b.gif";
  image2off = new Image();
  image2off.src = "/images/nav_02a.gif";

  image3on = new Image();
  image3on.src = "/images/nav_03b.gif";
  image3off = new Image();
  image3off.src = "/images/nav_03a.gif";

  image4on = new Image();
  image4on.src = "/images/nav_04b.gif";
  image4off = new Image();
  image4off.src = "/images/nav_04a.gif";

  image5on = new Image();
  image5on.src = "/images/nav_05b.gif";
  image5off = new Image();
  image5off.src = "/images/nav_05a.gif";

  image6on = new Image();
  image6on.src = "/images/nav_06b.gif";
  image6off = new Image();
  image6off.src = "/images/nav_06a.gif";
  
  image7on = new Image();
  image7on.src = "/images/nav_07b.gif";
  image7off = new Image();
  image7off.src = "/images/nav_07a.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");
    }
  }
}