/**
* Set a new position to show, when starting up the map.
*
* @param float $lat
* @param float $lng
* @return Gmap
*/
public function set_pos($lat = NULL, $lng = NULL)
{
if ($lat != NULL) {
$this->_options['lat'] = Gmap::validate_latitude($lat);
}
// if
if ($lng != NULL) {
$this->_options['lng'] = Gmap::validate_longitude($lng);
}
// if
return $this;
}