function openWindow() {
  var x = 270, y = 420; //default
  var xMax = 800, yMax=600; // default
  if (document.all) var xMax = screen.width, yMax = screen.height;
  else if (document.layers) var xMax = window.outerWidth, yMax = window.outerHeight;
  var xOffset = xMax - (x+20), yOffset = yMax - (y+60);
  window.open('talking','status=no,menubar=no,scrollbar=no,location=no,toolbar=no,width='+x+',height='+y+',screenX='+xOffset+',screenY='+yOffset+',top='+yOffset+',left='+xOffset+'');
}