function printwindow(mypage,myname,w,h)
{
  LeftPosition=(screen.width)?(screen.width-w)/2:100;
  TopPosition=(screen.height)?(screen.height-h)/2:100;
  settings='width='+w+',height='+h+',top='+TopPosition+',left='+LeftPosition+',scrollbars=yes,location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=yes';
  win=window.open(mypage,myname,settings);
}