getJSON for dropbox data

getJSON for dropbox data

Although i used getJSON in
http://jsbin.com/dbJSON/edit
i have not been able to connect with any of my own made up data.
i tried 4, and the example at Flickr for "cats".
Only the latter worked... this is the output:

{assoc: null,assoc.js: null,stub: null,stub.js: null,cat: [object Object]}

i am at that "base", as i did get the image there, but

http://sn.im/g-g4g/assoc.json
http://sn.im/g-g4g/assoc.js
http://sn.im/g-g4g/stub.json
http://sn.im/g-g4g/stub.js

were all invisible==null!

How do i get "my" data into the page?