function popup_pic( url, winname, width, height ) {
  if (winname == "") {
    winname = "popup";
  }
  if (width == "") {
    width = "400";
  }
  if (height == "") {
    height = "300";
  }
  var top = 2;
  var left = 2;
  var win_arg = "scrollbars=no,status=no,resizable=yes,location=no,toolbar=no,width=" + width + ",height=" + height + ",top=" + top + ",left=" + left;
  window.open(url,winname,win_arg);
}