function onKeyUp(e){
  if(typeof window.event!="undefined"){
    e=window.event;
  }
  var key = e.keyCode;
  if(key==Event.KEY_ESC) {
    closeWindowModal();
  }
}

if(document.attachEvent) {
  document.attachEvent('onkeyup', onKeyUp);
} else if(document.addEventListener) {
  document.addEventListener('keyup', onKeyUp , false);
}