function popup(mylink, windowname, lebar, tinggi) {
  if (! window.focus)return true;
    var href;
    if (typeof(mylink) == 'string')
      href=mylink;
  else
    href=mylink.href;
  window.open(href, windowname, "width="+lebar+",height="+tinggi+",scrollbars=yes");
  return false;
}