function launchWindow(url, name, width, height, scrollbar) {
  var str = "height=" + height + ",innerHeight=" + height;
  str += ",width=" + width + ",innerWidth=" + width;

  if (window.screen) {
    var ah = screen.availHeight - 30;
    var aw = screen.availWidth - 10;
    var xc = (aw - width);
    var yc = (ah - height);
    var xc = (aw - width)/2;
    var yc = (ah - height)/2;
 
    str += ",left=" + xc + ",screenX=" + xc;
    str += ",top=" + yc + ",screenY=" + yc;
    str += ",hotkeys=0,menubar=0,resizable=0,scrollbars=" + scrollbar + ",status=0";
 }
  return window.open(url, name, str);
}