Почему не отображается тень у маркера на google map?

function setMarkers(map, locations) {

        var image = new google.maps.MarkerImage('media/images/layout/other_bg/map_marker.png',

            new google.maps.Size(55,68),
            new google.maps.Point(0,0),
            new google.maps.Point(27.5,68)

        );

        var shadow = new google.maps.MarkerImage('media/images/layout/other_bg/map_marker_shadow.png',

            new google.maps.Size(60,63),
            new google.maps.Point(0,0),
            new google.maps.Point(30,68)

        );

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