newMapBounds = new google.maps.LatLngBounds();
newMapBounds.extend(new google.maps.LatLng(this._south, this._west));
newMapBounds.extend(new google.maps.LatLng(this._north, this._east));
map.fitBounds(newMapBounds);
newMapBounds = new google.maps.LatLngBounds();
newMapBounds.extend(new google.maps.LatLng(this._south, this._west));
newMapBounds.extend(new google.maps.LatLng(this._north, this._east));
map.fitBounds(newMapBounds);