function bmaps(midPoint, cityZoom, cityName, mapType) {
	map = new GMap2(document.getElementById("bmap"));
	map.addControl(new GLargeMapControl());
	map.addControl(new GMapTypeControl());
	map.addControl(new GScaleControl());
	map.setMapType(mapType);
	map.enableContinuousZoom();
	map.enableDoubleClickZoom();
	map.enableScrollWheelZoom();
	map.setCenter(midPoint, cityZoom);
// stations, corridors, routes
var xmlStations = new GGeoXml("http://www.chinabrt.org/kml/"+cityName+"Stations.xml?"+(new Date()).getDate());
map.addOverlay(xmlStations);
var xmlStations = new GGeoXml("http://www.chinabrt.org/kml/"+cityName+"Corridors.xml?"+(new Date()).getDate());
map.addOverlay(xmlStations);
var xmlRoutes = new GGeoXml("http://www.chinabrt.org/kml/"+cityName+"Routes.xml?"+(new Date()).getDate());
map.addOverlay(xmlRoutes);
}