function ecardfenster(){
       links=screen.width/2-325;
       oben=screen.height/2-300;
       window.open("","ecard","width=650,height=600,top= " + oben + ",left= " + links + ",toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=yes,resizable=1,copyhistory=0")
}




function pdfscreen(){
  links=screen.width/2-300;
  oben=screen.height/2-400;
  window.open("","pw_window","width=600,height=400,top= " + oben + ",left= " + links + ",toolbar=0,location=0,directories=0,status=0,menubar=0, scrollbars=yes,resizable=1,copyhistory=0");
}

function Slidefenster(pfad) {
   bildershow = window.open(pfad,"bildershow","width=50,height=50,resizable=0,locationbar=0,menubar=0,scrollbars=0,status=0,toolbar=0,left=180,top=120");
}

function katalog(){
   links=screen.width/2-360;
   oben=screen.height/2-300;
   window.open("","katalog_fenster","width=750,height=580,top= " + oben + ",left= " + links + ",toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=yes,resizable=1,copyhistory=0")
}