function win(URLStr, width, height)
{
		 var popUpWin=0;
		 var left = (screen.width/2) - width/2;
		  var top = (screen.height/2) - height/2;
		  if(popUpWin)
		  {
			if(!popUpWin.closed) popUpWin.close();
		  }
		  popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,location=yes,directories=no,status=no,menubar=no,scrollbar=yes,resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
}