function showInWindow(url) {
  var width = 340;
  var height = 350;
  var x = screen.availWidth / 2 - width / 2;
  var y = screen.availHeight / 2 - height / 2;
  window.open(url, "", 
    "toolbar=no,scrollbars=no,width=" + width +
    ",height=" + height + ",screenX=" + x + ",screenY=" + y + ",left=" + x + ",top=" + y);
}