javascript ajax xml, första värdet blir undefined

    <main>
    <form class="headform">
        <select id="landscapeMenu">
          <option>Välj län</option>
          <option value="blekinge">Blekinge</option>
          <option value="dalarna">Dalarna</option>
          <option value="gotland">Gotland</option>
          <option value="gavleborg">Gävleborg</option>
          <option value="halland">Halland</option>
          <option value="jamtland">Jämtland</option>
          <option value="jonkoping">Jönköping</option>
          <option value="kalmar">Kalmar</option>
          <option value="kronoberg">Kronoberg</option>
          <option value="norrbotten">Norrbotten</option>
          <option value="skane">Skåne</option>
          <option value="stockholm">Stockholm</option>
          <option value="sodermanland">Södermanland</option>
          <option value="uppsala">Uppsala</option>
          <option value="varmland">Värmland</option>
          <option value="vasterbotten">Västerbotten</option>
          <option value="vasternorrland">Västernorrland</option>
          <optino value="vastermanland">Västermanland</option>
          <option value="vastragotaland">Västra götaland</option>
          <option value="orebro">Örebro</option>
          <option value="ostergotland">Östergötland</option>
        </select>       

        <div id="cityresult"></div>      
  </main>

var landscapeMenuElem;
var cityResultElem;

function init() {
  landscapeMenuElem = document.getElementById("landscapeMenu");
  cityResultElem = document.getElementById("cityresult");

  addListener(landscapeMenuElem, "change", selectLandscape);
}
addListener(window,"load",init);


function selectLandscape() {
  var landscape;
  landscape = this.value;
  requestLandscapeData(landscape);
  
}

function requestLandscapeData(landscape) {
  var request;
  if(XMLHttpRequest) { request = new XMLHttpRequest(); }
  else if (ActiveXObject) { request = new ActiveXObject("Microsoft.XMLHTTP"); }
  else { alert("Tyvärr inget stöd för AJAX, så data kan inte läsas in"); return false; }

  request.open("GET", "xml/town/" + landscape + ".xml", true);
  request.send(null);
  request.onreadystatechange = function() {
    if(request.readyState == 4 || request.readyState == "complete")
      if(request.status == 200) getDataLandscape(request.responseXML);
        else landscapeElem.innerHTML = "Den begärda resursen finns inte";
  };
}


function getDataLandscape(XMLcode) {
  var cityElems;
  var nameElem;
  var i;
  var HTMLcode;			

  cityElems = XMLcode.getElementsByTagName("city");

  for (i=0; i<cityElems.length; i++) {
    type = cityElems[i].getAttribute("type");
    nameElem = cityElems[i].getElementsByTagName("name")[0];
    HTMLcode += nameElem.firstChild.data + "<br>";
  }
  cityResultElem.innerHTML = HTMLcode;
}