function popupWin(url,width,height) {
  var moveto_x = (screen.availWidth - width) / 2;
  var moveto_y = (screen.availHeight - height) / 2;
  var parms = 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=no,width='+width+',height='+height+',screenX='+moveto_x+',screenY='+moveto_y+',top='+moveto_y+',left='+moveto_x
  window.open(url,'popupWindow',parms)
}