map.php.html

  function initialize() {
    var map = new google.maps.Map(document.getElementById("map"), {
      center: new google.maps.LatLng(81, -158.5),
      zoom: 3,
      disableDoubleClickZoom: true,
      mapTypeControlOptions: {
        mapTypeIds: ["nw"]
      }
    });
    map.mapTypes.set('nw', nwMapType);
    map.setMapTypeId('nw');

    for (var i in locations) {
      locations[i].glatlng = new google.maps.LatLng(locations[i].latitude, locations[i].longitude);

      var marker = new google.maps.Marker({
        position : locations[i].glatlng, 
        map : map, 
        title : locations[i].title,
        index : i
      });

      var infowindow = new google.maps.InfoWindow({
        content: locations[i].content
      });

      attachInfoWindow(marker, infowindow);
    }

    function attachInfoWindow(marker, infowindow) {
      google.maps.event.addListener(marker, 'click', function() {
        infowindow.open(map, marker);
      });

      console.log(marker);
    }

    var center_myLatlng = new google.maps.LatLng(81, -158.5);
    var center_marker = new google.maps.Marker({
        position: center_myLatlng, 
        map: map, 
        title:"Center"
    });
  }