fsstat = 0;
function machauf(url) {
  fs = window.open(url, "Eigenschaft", "width=500,height=500,scrollbars=yes,resizable=yes");
  fsstat = 1;
  setTimeout('fs.focus()',750);
}
function machzu()
{
  if (fsstat==1) {
    if (fs.closed==false)
    {
       fs.document.forms[0].submit();
       fs.close();
    }
  }
}