// Set map options
var mapOptions = {
    center: new google.maps.LatLng(41.917142, -87.673837), // Or whatever
    zoom: 15,
    mapTypeId: "quest",
    mapTypeControlOptions: {
        mapTypeIds: [google.maps.MapTypeId.ROADMAP, google.maps.MapTypeId.SATELLITE, "quest"]
    },
    scrollwheel: false
}

// Create map, attach options
map = new google.maps.Map(window.document.getElementById("map_div"), mapOptions);

// Set quest options
var questOptions = {
    getTileUrl: function(coord, zoom) {
        return "http://mt1.google.com/vt/lyrs=8bit,m@174000000&hl=en&src=app&s=Galil&" + "z=" + zoom + "&x=" + coord.x + "&y=" + coord.y;
    },
    tileSize: new google.maps.Size(256, 256),
    isPng: true,
    maxZoom: 20,
    minZoom: 0,
    radius: 1738000,
    name: "Quest",
    credit: "SQUARE ENIX"
};

// Register quest options with a mapType "quest"
map.mapTypes.set("quest", new google.maps.ImageMapType(questOptions));