function KalenderWoche(j,m,t) {
  var image = "" 
  var Datum = new Date();
  if (!t) {
    j = Datum.getYear(); if (1900 > j) j +=1900;
    m = Datum.getMonth(); t = Datum.getDate();
  }
  else m--;
  Datum = new Date(j,m,t,0,0,1);
  var tag = Datum.getDay(); if (tag == 0) tag = 7;
  var d = new Date(2004,0,1).getTimezoneOffset();
  var Sommerzeit = (Date.UTC(j,m,t,0,d,1) - Number(Datum)) /3600000;
  Datum.setTime(Number(Datum) + Sommerzeit*3600000 - (tag-1)*86400000);
  var Jahr = Datum.getYear(); if (1900 > Jahr) Jahr +=1900;
  var kw = 1;
  if (new Date(Jahr,11,29) > Datum) {
    var Start = new Date(Jahr,0,1);
    Start = new Date(Number(Start) + 86400000*(8-Start.getDay()));
    if(Start.getDate() > 4) Start.setTime(Number(Start) - 604800000);
    kw = Math.ceil((Datum.getTime() - Start) /604800000);
  }
  document.write("<img src='img/titel/2012W" + kw + ".png' border='0' alt='Titelbild' />")
  return kw;
}