var popUpWin=0;
function popUpWindow(URLStr, width, height) {

	var left;
	var top;

  if(popUpWin) {
    if(!popUpWin.closed) popUpWin.close();
  }
  
  left = (screen.width - width) / 2;
  top = (screen.height - height) / 2;
  
  popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbar=no,resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');

}