var map;
    var geoXml = new GGeoXml("http://www.gpsbrianza.com/_KML/barro.kml");    

    var toggleState = 1;

function onLoad() {
  if (GBrowserIsCompatible()) {
    map = new GMap2(document.getElementById("map")); 
	map.addMapType(G_PHYSICAL_MAP); 
    map.addControl(new GSmallMapControl());
	map.addControl(new GMapTypeControl());
    map.setCenter(new GLatLng(45.832107,9.370107), 14, G_HYBRID_MAP); 
	
    map.addOverlay(geoXml);
  }
} 

function showIT(toShow){
	map.clearOverlays();
	if(toShow)
		map.addOverlay(geoXml);
}