function initialize() {
   var latlng = new google.maps.LatLng("<%=Html.Encode(Model.Field01.Field01) %>", "<%=Html.Encode(Model.Field01.Field03) %>");
    var myOptions = {
    zoom: 13,
        center: latlng,
        disableDefaultUI: false,
        navigationControl: true,
        navigationControlOptions: {style: google.maps.NavigationControlStyle.ZOOM_PAN},
        navigationControl: true,
        mapTypeId: google.maps.MapTypeId.ROADMAP

    };
    var map = new google.maps.Map(document.getElementById("mapcontainer"), myOptions);

    map.getMinimumResolution = function() { return 6 };

    var marker = new google.maps.Marker({
        position: latlng,
        map: map,
        title: "<%=Model.AccomName %>"
      });
}

map.getMinimumResolution = function() { return 6 };

var mt = map.getMapTypes();

for (var i=0; i<mt.length; i++) {
  mt[i].getMinimumResolution = function() {return 6;}
}

var inProcess = false;

function onZoomChanged() {
    if (inProcess) return;

    if (gmap.getZoom() > 16) {
        inProcess = true;
        gmap.setZoom(16);
        inProcess = false;
        return
    }
    else if (gmap.getZoom() < 10) {
        inProcess = true;
        gmap.setZoom(10);
        inProcess = false;
        return;
    }
}

google.maps.event.addListener(gmap, 'zoom_changed', onZoomChanged);

<script type="text/javascript>
var latlng = new google.maps.LatLng(42.3493337, 13.398172299999942);
var options = {
    zoom: 8,
    minZoom: 6,
    maxZoom: 10,
    center: latlng,
    mapTypeId: google.maps.MapTypeId.TERRAIN
};

map = new google.maps.Map(document.getElementById("map_canvas"), options);
</script>

google.maps.event.addListener(map, "zoom_changed", function() {
    if (map.getZoom() > 12) map.setZoom(12);
});

// force normal maps type
map.setMapType(G_NORMAL_MAP);

// define minimum and maximum zoom levels
G_NORMAL_MAP.getMinimumResolution = function() { return 0; }
G_NORMAL_MAP.getMaximumResolution = function() { return 19; }