var map;
    var geoXml = new GGeoXml("http://www.gpsbrianza.com/_KML/farisicilia/faro_riposto_2.kml");    

    var toggleState = 1;

function onLoad() {
  if (GBrowserIsCompatible()) {
    map = new GMap2(document.getElementById("map")); 
    map.addControl(new GSmallMapControl());
	map.addControl(new GMapTypeControl());
	map.addMapType(G_PHYSICAL_MAP); 
    map.setCenter(new GLatLng(37.70866657733798,15.21950244433497), 15, G_HYBRID_MAP); 
	map.enableScrollWheelZoom();
    map.addOverlay(geoXml);
  }
} 


var txt1 ="Vai al percorso corto";
var txt2 ="Vai al percorso lungo";

function toggleMyKml() {

  if (toggleState == 1) {
    map.removeOverlay(geoXml);
	map.addOverlay(geoXml2);
    document.getElementById('togglePercorsi').value = txt1;
    toggleState = 0;
  } else {
    map.removeOverlay(geoXml2);
	map.addOverlay(geoXml);
	document.getElementById('togglePercorsi').value = txt2;
    toggleState = 1;
  }
}