var y1 = 20;   // change the # on the left to adjuct the Y co-ordinate
(document.getElementById) ? dom = true : dom = false;
function hideIt() {
  if (dom) {document.getElementById("layer1").style.visibility='hidden';}
  if (document.layers) {document.layers["layer1"].visibility='hide';} }

function showIt() {
  if (dom) {document.getElementById("layer1").style.visibility='visible';}
  if (document.layers) {document.layers["layer1"].visibility='show';} }