Call skrollr.js via JS

// Source: http://www.bram.us/2014/01/01/skrollr-css-animations-linked-to-scroll-position/

var setSkrollr = function($el, data) {
					for (var i = 0, l = data.length; i < l; i++) {
						var d = data[i],
						px = d[0];
						css = d[1];
						$el.attr('data-' + px, css);
					}
}
setSkrollr($('#example'), [[0, 'width:100%'], [1500, 'width:0%']]);
setSkrollr($('#example2'), [[0, 'transform:translateY(-100%)'], [1500, 'transform:translateY(100%)']]);