function openWindow(theURL,h,w) {
  if (openWindow.arguments.length < 3) {
    w = 700;
  }
  if (openWindow.arguments.length < 2) {
    h = 400;
  }

  w = eval(w);
  h = eval(h);

  var screenH = screen.availWidth;
  var screenW = screen.availHeight;
  var Xpos = (screenH - w - 10) / 2;
  var Ypos = (screenW - h - 30) / 2;
  var windowName = "myWindow_" + h + "_" + w;

  var features = "height=" + h + ",width=" + w;
  if (navigator.appName.indexOf("Microsoft") >= 0) {
    features = features + ",left=" + Xpos + ",top=" + Ypos;
  } else {
    features = features + ",screenX=" + Xpos + ",screenY=" + Ypos;
  }
  features = features + ",scrollbars=yes,toolbars=no,location=no,directories=no";
  myWindow = open(theURL, windowName, features);
}