javascript - Detecting the end (drop) of a Scrollbar Event -

i need detect when user has stopped scrolling only in scrollbar.

there site: http://beoplay.com/products/beoplaya9, doing need.

i need readjust page position if user has scrolled (with scroll bar) , left scroll between 2 pages. notice in example website page position readjusted @ 'drop' of scroll bar.

this question has been asked many times, not way, i've seen this plugin james padolsey, doesn't work example website.

i have code in jsfiddle: http://jsfiddle.net/promatik/7rkgv/
handling of mouse wheel done, can't figure out how handle scroll bar move know when dropped.

maybe there away differentiate event wheel scroll , scroll bar scroll.

$(window).on('scroll', function (event) {     console.log(event); }); 

does know how replicate effect in example?