isIE=document.all;
isNN=!document.all&&document.getElementById;
isN4=document.layers;


function ExtCancel(){
  if (isIE||isNN) { 
		document.getElementById("theLayer").style.visibility="hidden";
  document.getElementById("theLayer").style.display="none";
  document.getElementById("overlay").style.visibility="hidden";
  document.getElementById("overlay").style.display="none";}
  else if (isN4) {
		document.theLayer.visibility="hide";
  document.theLayer.display="none"
		document.overlay.visibility="hide"
  document.overlay.display="none";
  }
}

function ExtLink(){
  if (isIE) {
		document.getElementById("theLayer").style.visibility="visible";
  document.getElementById("theLayer").style.display="block";
  document.getElementById("theLayer").style.width = document.body.offsetWidth-75;
  document.getElementById("theLayer").style.height = document.body.offsetHeight-100;
  document.getElementById("theLayer").style.left = '50%';
  document.getElementById("theLayer").style.top = '50%';
		document.getElementById("theLayer").style.marginLeft = "-" + parseInt(document.getElementById("theLayer").offsetWidth / 2) + "px";
  document.getElementById("theLayer").style.marginTop = "-" + parseInt(document.getElementById("theLayer").offsetHeight / 2) + "px";
		document.getElementById("overlay").style.width = document.body.offsetWidth-21 + 'px';
		document.getElementById("overlay").style.height = document.body.offsetHeight + 'px';
		document.getElementById("overlay").style.left = '0px';
		document.getElementById("overlay").style.top = '0px';
		document.getElementById("overlay").style.visibility="visible";
  document.getElementById("overlay").style.display="block";
		}
  else if (isNN) {
		document.getElementById("theLayer").style.visibility="visible";
  document.getElementById("theLayer").style.display="block";
  document.getElementById("theLayer").style.width = '94%';
  document.getElementById("theLayer").style.height = '94%';
  document.getElementById("theLayer").style.left = '2%';
  document.getElementById("theLayer").style.top = '1%';
		document.getElementById("theLayer").style.marginLeft = '10px';
  document.getElementById("theLayer").style.marginTop = '10px';
		document.getElementById("overlay").style.width = '100%';
		document.getElementById("overlay").style.height = '100%';
		document.getElementById("overlay").style.left = '0px';
		document.getElementById("overlay").style.top = '0px';
		document.getElementById("overlay").style.visibility="visible";
  document.getElementById("overlay").style.display="block";
  }
}