function openWindow(windowURL,windowName,windowWidth,windowHeight) {
  window.name = 'parentWnd';

  newWindow = window.open(windowURL,windowName,'width='+windowWidth+',height='+windowHeight+',toolbar=0,location=0,directories=0,status=0,menuBar=0,scrollBars=1,resizable=1,left='+screen.width/2+',top=200');
  newWindow.focus();
}