Google Maps API: Center / Zoom in bounds

center-map-zoom.js

//  Create a new viewpoint bound
var bounds = new google.maps.LatLngBounds();
//  Go through each...
for (var i = 0, LtLgLen = _latlng.length; i < LtLgLen; i++) {
  //  And increase the bounds to take this point
  bounds.extend (_latlng[i]);
}
//  Fit these bounds to the map
map.fitBounds(bounds);