:
var marker = new google.maps.Marker({...})
var infowindow = new google.maps.InfoWindow({
content: "Some content"
});
infowindow.open(map,marker);
google.maps.event.addListener(infowindow, 'domready', function() {
$( '.gira' ).change(function(){alert('a')})
})
API Ref: , InfoWindow DOM