that crossed my mind, but from the comments above i think he he wants multiple content boxes being populated from a number of different triggers, although he's using an id (of which he can only have one instance of anyway) as the identifier for the loading icon.
i'm not sure this is the best way of doing it, cos unless i'm misunderstanding quite what he wants to do he'll only be able to process one ajax request at a time doing it like this. Alexandre, how are you triggering the ajax request?