Is it possible in Google Maps API 3 to access elements inside an infowindow?

Question

JavaScript

On event, I need to add text to input inside infowindow. I didn't find anything like that in the documentation. It is possible to overwrite the entire contents of the infowindow, but I think there must be some simpler solution
. A short example:

google.maps.event.addListener(infowindow,'domready',function(){
      $('.smiles span').click(function() {
             $('.text').val($('.text').val() + $(this).data('code'));
      });
});