function popup (Adresse) {
  MeinFenster = window.open(Adresse, "Erstfenster", "width=1000,height=600,resizeable=yes");
  MeinFenster.focus();
}
function popup2 (Adresse) {
  MeinFenster = window.open(Adresse, "Zweitfenster", "width=1000,height=600,resizeable=yes,scrollbars=yes");
  MeinFenster.focus();
}
function popup3 (Adresse) {
  MeinFenster = window.open(Adresse, "Zweitfenster", "width=1000,height=600,resizeable=yes,location=yes,toolbar=yes,scrollbars=yes");
  MeinFenster.focus();
}