if (document.images) {
  image1on = new Image();
  image1on.src = "images/nav/f4-mo1-on.gif";

  image2on = new Image();
  image2on.src = "images/nav/f4-mo2-on.gif";

  image3on = new Image();
  image3on.src = "images/nav/f4-mo3-on.gif";

  image4on = new Image();
  image4on.src = "images/nav/f4-mo4-on.gif";

  image5on = new Image();
  image5on.src = "images/nav/f4-mo5-on.gif";

  image6on = new Image();
  image6on.src = "images/nav/f4-mo6-on.gif";

  image7on = new Image();
  image7on.src = "images/nav/f4-mo7-on.gif";

  image8on = new Image();
  image8on.src = "images/nav/f4-mo8-on.gif";

  image9on = new Image();
  image9on.src = "images/nav/f4-mo9-on.gif";

  image10on = new Image();
  image10on.src = "images/nav/f4-mo10-on.gif";

  image11on = new Image();
  image11on.src = "images/nav/f4-mo11-on.gif";

  image12on = new Image();
  image12on.src = "images/nav/f4-mo12-on.gif";

  image13on = new Image();
  image13on.src = "images/nav/f4-mo13-on.gif";

  image14on = new Image();
  image14on.src = "images/nav/f4-mo14-on.gif";

  image15on = new Image();
  image15on.src = "images/nav/f4-mo15-on.gif";

  image16on = new Image();
  image16on.src = "images/nav/f4-mo16-on.gif";

  image17on = new Image();
  image17on.src = "images/nav/f4-mo17-on.gif";

  image18on = new Image();
  image18on.src = "images/nav/f4-mo18-on.gif";



  image1off = new Image();
  image1off.src = "images/nav/f4-mo1-off.gif";

  image2off = new Image();
  image2off.src = "images/nav/f4-mo2-off.gif";

  image3off = new Image();
  image3off.src = "images/nav/f4-mo3-off.gif";

  image4off = new Image();
  image4off.src = "images/nav/f4-mo4-off.gif";

  image5off = new Image();
  image5off.src = "images/nav/f4-mo5-off.gif";

  image6off = new Image();
  image6off.src = "images/nav/f4-mo6-off.gif";

  image7off = new Image();
  image7off.src = "images/nav/f4-mo7-off.gif";

  image8off = new Image();
  image8off.src = "images/nav/f4-mo8-off.gif";

  image9off = new Image();
  image9off.src = "images/nav/f4-mo9-off.gif";

  image10off = new Image();
  image10off.src = "images/nav/f4-mo10-off.gif";

  image11off = new Image();
  image11off.src = "images/nav/f4-mo11-off.gif";

  image12off = new Image();
  image12off.src = "images/nav/f4-mo12-off.gif";

  image13off = new Image();
  image13off.src = "images/nav/f4-mo13-off.gif";

  image14off = new Image();
  image14off.src = "images/nav/f4-mo14-off.gif";

  image15off = new Image();
  image15off.src = "images/nav/f4-mo15-off.gif";

  image16off = new Image();
  image16off.src = "images/nav/f4-mo16-off.gif";

  image17off = new Image();
  image17off.src = "images/nav/f4-mo17-off.gif";

  image18off = new Image();
  image18off.src = "images/nav/f4-mo18-off.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");
    }
  }
}