function setLayerDisplay( layerName ) {
  if ( document.getElementById ) {

    var w = document.getElementById(layerName);
    if (w.style.display == "none")
    {
      w.style.display = "block";
    } else 
    {
      w.style.display = "none";
    }
  }
}
function new_window(url) {
 link = window.open(url,"Link","toolbar=0,location=0,directories=0,status=0,menubar=no,scrollbars=yes,resizable=yes,width=522,height=282");
}