function showCurrentPerimeters() {
   mgr.clearMarkers();
   geoXml = new GGeoXml("http://rmgsc.cr.usgs.gov/outgoing/GeoMAC/2009_fire_data/KMLS/ActiveFirePerimeters.kml");
   map.addOverlay(geoXml);
   
   map.setCenter(new GLatLng(38.422179,-96.937288), 3);
   
}