Can't disable horizontal scrolling

[mirko-dugic]

Here is my test site in responsinator (that pretends mobile view):

http://www.responsinator.com/?url=http%3A%2F%2Fprolusatia.nazwa.pl%2Fmy-test%2F

I can't disable horizontal scrolling in it. I followed official documentation and added:

$(window).stellar({
horizontalScrolling: false,
verticalScrolling: true,
verticalOffset: 0,
horizontalOffset: 0,
responsive: true

});

Into: http://prolusatia.nazwa.pl/my-test/js/js.js

What I'm doing wrong? I just can't get it work.
Files ware taken from here: http://cdn.tutsplus.com/webdesign/uploads/legacy/tuts/338_parallax/src/index.html
Could anyone point me to right direction?