var popy1 = 150;   // change the # on the left to adjust the Y co-ordinate

(document.getElementById) ? dom = true : dom = false;



function hideItdark() {

  if (dom) {document.getElementById("darklayer").style.visibility='hidden';}

  if (document.layers) {document.layers["darklayer"].visibility='hide';}

}



function showItdark() {

  if (dom) {document.getElementById("darklayer").style.visibility='visible';}

  if (document.layers) {document.layers["darklayer"].visibility='show';}

}



function placeItdark() {

  if (dom && !document.all) {document.getElementById("darklayer").style.top = window.pageYOffset + (window.innerHeight - (window.innerHeight))}

  if (document.layers) {document.layers["darklayer"].top = window.pageYOffset + (window.innerHeight - (window.innerHeight))}

  if (document.all) {document.all["darklayer"].style.top = document.body.scrollTop + (document.body.clientHeight - (document.body.clientHeight));}

  window.setTimeout("placeItdark()", 10); }