function blink() {
  if (!document) return;

  var blink_obj = document.getElementById("blink");

  if (!blink_obj) return;

  if (blink_obj.style.visibility == "visible") {
    blink_obj.style.visibility = "hidden";
  } else {
    blink_obj.style.visibility = "visible";
  }

/*
  if (!document.all) { return; }
  for (i = 0; i < document.all.length; i++) {
    obj = document.all(i);
    if (obj.className == "blink") {
      if (obj.style.visibility == "visible") {
        obj.style.visibility = "hidden";
      } else {
        obj.style.visibility = "visible";
      }
    }
  }
*/
  setTimeout("blink()", 800);
}