change the map when the first baselayer loads. git-svn-id: http://svn.openlayers.org/trunk/openlayers@1537 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
change the map when the first baselayer loads. git-svn-id: http://svn.openlayers.org/trunk/openlayers@1537 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf