if (lat == 0) { // if the database doesn't have lat/long coordinates so we appear to be on the equator, convert the OS Grid reference
	var osref = getOSRefFromSixFigureReference(os);
	var latlng = osref.toLatLng();
	lat = latlng.lat;
	lng = latlng.lng;
}

function load() {
	if (GBrowserIsCompatible()) {
		var map = new GMap2(document.getElementById("map"));
		map.addControl(new GSmallMapControl());
		map.addControl(new GMapTypeControl());
		var centre = new GLatLng(lat, lng);
		map.setCenter(centre, 13);
		map.addOverlay(new GMarker(centre));
	}
	resetRadius(DEFAULT_RADIUS);
}