I've created some advanced javascript/jquery code for a drupal module I'm developing.

In the js there has been quit some appending to select-list. Recently a problem occurs when I want to append to more lists at the same time, the strange thing is that only the last list really does the appending. I’ve switched it, did all other kind of stuff, but the problem is clearly with the append. So now I’m wondering what function really does when you call the append, do I need to create a manual flush or so?