function openNewWindow(URLtoOpen, windowName, windowFeatures) { newWindow=window.open(URLtoOpen, windowName, windowFeatures); }
function winCenterCoordinates(w,h){
  LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
  TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
  position = ',top=' + TopPosition+ ',left=' + LeftPosition + ',height=' + h + ',width=' + w;
  return position;
}