Dynamically load google maps api v3 with namespaced callback function

I recently ran across the following problem when lazy loading/dynamically loading the google maps api v3: In order to check whether the api has fully loaded or not, I followed the instructions on google's documentation page. Works fine with a normal function callback name like &callback=initialize in global scope. Also works fine with a function callback that is within a certain namespace like &callback=Namespace.initialize.

Now my function is placed under Namespace.foo[0].initialize ("Namespace" and "foo" are of type object). The problem now is that I can't properly access this function. I tried several ways of buildin开发者_开发问答g the callback string, each listed below with whatever firebug tells me is not working:

&callback=Namespace.foo[0].initialize
Firebug: NetworkError: 403 Forbidden - <http://maps.googleapis.com/maps/api/js?v=3...&callback=Namespace.foo[0].initialize...>

&callback=Namespace.foo.0.initialize
Firebug: missing ; before statement
Firebug: [Break On This Error] window.Namespace.foo[0].initialize()

&callback=Namespace.foo%5B0%5D.initialize
Firebug: NetworkError: 403 Forbidden - <http://maps.googleapis.com/maps/api/js?v=3...&callback=Namespace.foo[0].initialize...>

I'm thankful for every hint and/or solution!

Background information: What I do might also be interesting. A script is dynamically loading html, css, data and the google maps api into a external webpage (within a web-widget). Now I'm using jQuery's deferred object to queue the different includes such as loading the css/javascript/html first, then receive the data and finally setup the google map within the previously loaded structure. Deferred object performs way better than handling the different steps with callbacks (and much easier too!), but when the jQuery.getScript method is done (loads the google maps api) the success event is fired and deferred.resolve gets returned. Too bad that this probably just handles the authentification (via client-key) and then asynchronously loads the google maps main.js. This pretty much sucks because I need to wait for the api to fully load...