function SetGeoAnchor($attrlat, $attrlong, $lat, $long)
{
assert(is_string($attrlat));
assert(is_string($attrlong));
assert(is_float($lat));
assert(is_float($long));
$this->_anchor = array("attrlat" => $attrlat, "attrlong" => $attrlong, "lat" => $lat, "long" => $long);
}