<!DOCTYPE html>

<html>

  <head>

    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">

    <meta charset="utf-8">

    <title>KML Layers</title>

    <style>

      html, body, #map-canvas {

        height: 100%;

        margin: 0px;

        padding: 0px

      }

    </style>

    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&signed_in=true"></script>

      </head>

  <body>

  <script>

function initialize() {

  var koshigaya = new google.maps.LatLng(35.53,139.47);

  var mapOptions = {

    zoom:8,

    center: koshigaya

  }


  var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);


  var ctaLayer = new google.maps.KmlLayer({

    url: 'http://potametabo.com/kml/20140928.kml'

  });

  ctaLayer.setMap(map);

}


google.maps.event.addDomListener(window, 'load', initialize);


    </script>


    <div id="map-canvas"></div>

  </body>

</html>