if (document.images) {
  image0on = new Image();
  image0on.src = "buttons/h4.gif";

  image1on = new Image();
  image1on.src = "buttons/au2.gif";

  image2on = new Image();
  image2on.src = "buttons/p2.gif";

  image3on = new Image();
  image3on.src = "buttons/b2.gif";

  image4on = new Image();
  image4on.src = "buttons/f2.gif";

  image5on = new Image();
  image5on.src = "buttons/so2.gif";

  image6on = new Image();
  image6on.src = "buttons/wcc4.gif";

  image7on = new Image();
  image7on.src = "buttons/ctsc4.gif";

  image8on = new Image();
  image8on.src = "buttons/faq4.gif";

  image9on = new Image();
  image9on.src = "buttons/boas4.gif";

  image10on = new Image();
  image10on.src = "buttons/mft4.gif";
  
  image11on = new Image();
  image11on.src = "buttons/dtr4.gif";
  
  image12on = new Image();
  image12on.src = "buttons/yw4.gif";

  image13on = new Image();
  image13on.src = "buttons/wcu4.gif";

  image14on = new Image();
  image14on.src = "buttons/ot4.gif";
  
  image15on = new Image();
  image15on.src = "buttons/fs4.gif";
  
  image16on = new Image();
  image16on.src = "buttons/pc4.gif";
  
  image0off = new Image();
  image0off.src = "buttons/h3.gif";
  
  image1off = new Image();
  image1off.src = "buttons/au1.gif";

  image2off = new Image();
  image2off.src = "buttons/p1.gif";

  image3off = new Image();
  image3off.src = "buttons/b1.gif";

  image4off = new Image();
  image4off.src = "buttons/f1.gif";

  image5off = new Image();
  image5off.src = "buttons/so1.gif";

  image6off = new Image();
  image6off.src = "buttons/wcc3.gif";

  image7off = new Image();
  image7off.src = "buttons/ctsc3.gif";

  image8off = new Image();
  image8off.src = "buttons/faq3.gif";

  image9off = new Image();
  image9off.src = "buttons/boas3.gif";
  
  image10off = new Image();
  image10off.src = "buttons/mft3.gif";
  
  image11off = new Image();
  image11off.src = "buttons/dtr3.gif";

  image12off = new Image();
  image12off.src = "buttons/yw3.gif";

  image13off = new Image();
  image13off.src = "buttons/wcu3.gif";

  image14off = new Image();
  image14off.src = "buttons/ot3.gif";
  
  image15off = new Image();
  image15off.src = "buttons/fs3.gif";
  
  image16off = new Image();
  image16off.src = "buttons/pc3.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");
    }
  }
}