var popUpWin=0;

function rand()
      {
          var now=new Date()
          var num=(now.getSeconds())%10
          var num=num+1
		  return num;
      }

function popUpWindow(URLStr, left, top, width, height)
{
  if(popUpWin)
  {
    if(!popUpWin.closed) popUpWin.close();
  }
  popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menub ar=no,scrollbar=no,resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
}

function popUpRand(URLStr1,URLStr2)
{
	var n;
	n=rand();
	if (Number(n)<=7)
	{
		popUpWindow(URLStr1,200,200,300,425);
	}
	else
	{
		popUpWindow(URLStr2,200,200,300,300);
	}
}