function imgOn(iname) {
  if (document.images) {
    if (eval(iname + "1.complete")) {
      document.images[iname].src = eval(iname + "1.src");
    }
  }
}

function imgOff(iname) {
  if (document.images) {
    if (eval(iname + "0.complete")) {
      document.images[iname].src = eval(iname + "0.src");
    }
  }
}