function popUpWindow(URLStr, popName, width, height, left, top)
{
  vpopName =popName;
  if(!left) left=(screen.availWidth-width)/2;
  if(!top) top=(screen.availHeight-height)/2;
  vpopName = window.open(URLStr, popName, 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
}