dom.event.addEventListener(window, 'load', initDocument);
function initDocument() {
  var popupBtn = document.getElementById('popupBtn');
  dom.event.addEventListener(popupBtn, 'click', openChildWin);
}

function openChildWin(evt) {
  var target = 'KeyboardEvents2_child.html';
  var w = window.open(target,"help","width=200,height=120,top=100,left=100,toolbar=no,location=no,menubar=no,directories=no,scrollbars=yes,resize=yes");
  w.focus();
}