Google Map API KMLデータの読み込み #JavaScript

<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false&hl=ja"></script>
<script type="text/javascript">
  function initialize() {
    var initPos = new google.maps.LatLng(36.3219088, 139.0032936);
    var myOptions = {
      noClear : true,
      center : initPos,
      zoom : 12,
      mapTypeId : google.maps.MapTypeId.ROADMAP
    };
    var map_canvas = new google.maps.Map(document.getElementById("map_canvas"), myOptions);

    var kmlUrl = "http://<ホスト名>/hoge.kml"; //KMLファイルの読み込み
    var kmlLayer = new google.maps.KmlLayer(kmlUrl, {preserveViewport:true});
    kmlLayer.setMap(map_canvas);

  }
</script>
</head>
<body onload="initialize()">
  <div id="map_canvas" style="width:100%; height:100%"></div>
</body>
</html>

Google Map上に学校区情報（国土数値情報）を表示する