if (document.images) {
  image1on = new Image();
  image1on.src = "pchi_on.gif";
  image2on = new Image();
  image2on.src = "pele_on.gif";
  image3on = new Image();
  image3on.src = "pinf_on.gif";
  image4on = new Image();
  image4on.src = "pmec_on.gif";
  image5on = new Image();
  image5on.src = "ptec_on.gif";
  image6on = new Image();
  image6on.src = "phome_on.gif";
  image7on = new Image();
  image7on.src = "pmail_on.gif";


  image1off = new Image();
  image1off.src = "pchi.gif";
  image2off = new Image();
  image2off.src = "pele.gif";
  image3off = new Image();
  image3off.src = "pinf.gif";
  image4off = new Image();
  image4off.src = "pmec.gif";
  image5off = new Image();
  image5off.src = "ptec.gif";
  image6off = new Image();
  image6off.src = "phome.gif";
  image7off = new Image();
  image7off.src = "pmail.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");
    }
  }
}