function aa_popup()
{
	aa_popwin = window.open("mac.popup.php","aa_pop_win","toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width=545,height=603");
	aa_popwin.focus();
}

function hideAllLayersPop()
{
  document.getElementById('overlay1').style.visibility = "hidden";
  document.getElementById('overlay2').style.visibility = "hidden";
  document.getElementById('overlay3').style.visibility = "hidden";
  document.getElementById('overlay4').style.visibility = "hidden";
  document.getElementById('overlay5').style.visibility = "hidden";
}

function showLayerPop(layerid)
{
  hideAllLayersPop();
  document.getElementById(layerid).style.visibility = "visible";
}