Extend Google Maps marker to animate smoothly on update?

Using the Google Maps API v3 I've been able to update multiple positions of markers via an AJAX call. However, it lacks any transition. Code below:

if ( !latlong.equals( point.latlong ) ) {
    point.latlong = latlong;
    point.marker.setPosition(latlong);
}

The drawback is that setPosition has no native animation method. Does anyone know any methods for extending setPosition so the marker can fluently "move" from it's old to new position? Or any methods available? I have not been able to find any documentation. Thanks!