谷歌地图地形视图默认

我想弄清楚如何使我的谷歌地图嵌入默认的"地形视图"和禁用其他选项，如卫星视图和街景。有人能给我指个方向吗?这是我的代码…

这是它目前的呈现方式:http://img842.imageshack.us/img842/7299/screenshot20111220at125.png

var map;
var middle_earth_MORADOR = new google.maps.LatLng(38, 0);
    function initialize() {
        // Define Styles
        var styles = [ 
            {
                //featureType: "all", elementType: "all", stylers: [ { visibility: "on" }, { hue: "#e5f5fb" } ]
            }
        ];

        // Default map options
        var mapOptions = {
            zoom: 2,
            center: middle_earth_MORADOR,
            backgroundColor: "#000"
        };
        var locations = [
            <?php foreach ($Projects as $Project) {             
                $oProjectPhotos = new clsProjectPhotos($Project['idProject']);
                $photos = $oProjectPhotos->getProjectPhotos();
                echo '["'.$Project["Name"].'", '.$Project["gmapslat"].', '.$Project["gmapslng"].', "'.$Project["CountryName"].'"],';
                echo "'n";
                echo "'t't";
            }
            ?>  
        ];

        map = new google.maps.Map(document.getElementById("map_canvas"),mapOptions);
        var styledMapOptions = {
            map: map,
            name: "map"
        }
        var build =  new google.maps.StyledMapType(styles,styledMapOptions);
        map.mapTypes.set('map', build);
        map.setMapTypeId('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, 'mouseover', (function(marker, i) {
            return function() {
              infowindow.setContent(
                '<div>' + locations[i][0] + '</div>'+
                '<div>' + locations[i][4] + '</div>'+
                '<div>' + locations[i][5] + '</div>'+
                '<div>' + locations[i][6] + '</div>'
              );
              infowindow.open(map, marker);
            }
          })(marker, i));
        }
    }