function Werteliste(querystring) {
  if(querystring == '') return;
  var wertestring = decodeURI(querystring);
  wertestring = wertestring.slice(1);
  var paare = wertestring.split("&");
  for (var i=0; i < paare.length; i++) {
    var name = paare[i].substring(0, paare[i].indexOf("="));
    var wert = paare[i].substring(paare[i].indexOf("=")+1, paare[i].length);
    this[name] = wert;
  }
}