codice:
marker = new google.maps.Marker({
   position: new google.maps.LatLng(markers[i][1], markers[i][2]),
   map: map,
   content: markers[i][0]
});

google.maps.event.addListener(marker, 'click', function(){
     infowindow.setContent(this.content);
     infowindow.open(map, this);
});