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<style>
  #map_canvas {
    height: 800px;
    margin: 0px;
    padding: 0px;
  }
</style>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&key=AIzaSyBjt7bjLLGOWjfQUlU_HDeeSFp-Vee-TzY&sensor=false"></script>
<script>
    function initialize() {

        var myLatlng = new google.maps.LatLng(-28.0846686,153.4759664);

        var mapOptions = {
            zoom: 12,
            center: myLatlng
        };   

        // instatiate map
        var map = new google.maps.Map(document.getElementById('map_canvas'), mapOptions);

        // create marker options
        var marker = new google.maps.Marker({
            position: myLatlng,
            title:"Hello World!"
            
        });

        var infoWindow = new google.maps.InfoWindow({
            content: "Shark!"
        });

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


        // To add the marker to the map, call setMap(); (after map is istantiated)
        marker.setMap(map);

    }

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

</script>


<div id="map_canvas"></div>