function BildFenster (Name) {
  Fenster1 = window.open(Name, "Bildergalerie", "width=450,height=400,left=300,top=100");
  Fenster1.focus();
}

function DekorFenster (Name) {
  Fenster2 = window.open(Name, "Dekorfarben", "width=400,height=465,left=300,top=90");
  Fenster2.focus();
}

function RuckwandFenster (Name) {
  Fenster3 = window.open(Name, "Rückwände", "width=550,height=300,left=250,top=90");
  Fenster3.focus();
}