<script type="text/javascript">

    var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 17,
      center: new google.maps.LatLng(3.723, 103.1240),
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });

    document.getElementById("demo").innerHTML = initMap(map);

    function initMap(map) {
    var infowindow = new google.maps.InfoWindow();

    var marker, i;

    for (i = 0; i < locations.length; i++) {
      marker = new google.maps.Marker({
        position: new google.maps.LatLng(locations[i][1], locations[i][2]),
        map: map
      });

      google.maps.event.addListener(marker, 'click', (function(marker, i) {
        return function() {
          infowindow.setContent(locations[i][0]);
          infowindow.open(map, marker);
        }
      })(marker, i));
    }

    }//initMap
    </script>