function musicplayer (Adresse) {
  MeinFenster = window.open(Adresse, "MeinFenster", "width=200,height=150,left=20,top=20");
  MeinFenster.focus();
}

function hilfe (Adresse) {
  Hilfe = window.open(Adresse, "Hilfe", "width=300,height=500,left=20,top=20");
  Hilfe.focus();
}

function videoplayer (Adresse) {
  MeinFenster = window.open(Adresse, "MeinFenster", "width=500,height=600,left=20,top=20");
  MeinFenster.focus();
}