// Crea un marker nel punto e con il testo indicato
function createMarker(point, text) {
   var marker = new GMarker(point);
   GEvent.addListener(marker, "click", function() {marker.openInfoWindowHtml(text);});
   return marker;
}
function createMarkerOptions(point, text, markerOptions) {
   var marker = new GMarker(point, markerOptions);
   GEvent.addListener(marker, "click", function() {marker.openInfoWindowHtml(text);});
   return marker;
}