Ok, then let's go back to the original problem, I figured that I had a Flickr showing my previous works (that I thought was lost in my laptop crash \o/), and I wanted to use the API to show it on my website.
First of all I initially intented to make a GET request to get my gallery data. This was not an option because of cross domain request limitation. I passed this issue rapidly by changing it to JSONP because cross domain request limitation do not apply for JSONP. Ok, we're getting to the point of this article, I wanted to share with you some JSONP specifics for you to understand why it allows us to make cross domain requests.