jQuery(document).ready(function($){
	var timelineBlocks = $('.cd-timeline-block'),
		offset = 0.8;

	// hide timeline blocks which are outside the viewport
	hideBlocks(timelineBlocks, offset);

	// on scolling, show/animate timeline blocks when enter the viewport
	$(window).on('scroll', function() {		
		st = $(this).scrollTop();
		if (st < lastScrollTop) {
		    (!window.requestAnimationFrame) 
			? setTimeout(function(){ hideBlocks(timelineBlocks, offset); }, 300)
			: window.requestAnimationFrame(function(){ showBlocks(timelineBlocks, offset); });
		}
		else {
		    (!window.requestAnimationFrame) 
			? setTimeout(function(){ showBlocks(timelineBlocks, offset); }, 300)
			: window.requestAnimationFrame(function(){ showBlocks(timelineBlocks, offset); });
		}
		lastScrollTop = st;		
	});
	
	

	function hideBlocks(blocks, offset) {
		blocks.each(function(){
			( $(this).offset().top > $(window).scrollTop()+$(window).height()*offset ) && $(this).find('.cd-timeline-img, .cd-timeline-content').addClass('is-hidden');
		});
	}

	function showBlocks(blocks, offset) {
		blocks.each(function(){
			( $(this).offset().top <= $(window).scrollTop() + $(window).height() * offset && $(this).find('.cd-timeline-img').hasClass('is-hidden') ) && $(this).find('.cd-timeline-img, .cd-timeline-content').removeClass('is-hidden').addClass('bounce-in');
		});
	}
});

jQuery(document).ready(function($){
	var timelineBlocks = $('.cd-timeline-block'),
		offset = 0.8;

	// hide timeline blocks which are outside the viewport
	hideBlocks(timelineBlocks, offset);

	// on scolling, show/animate timeline blocks when enter the viewport
	var lastScrollTop = 0;
	$(window).on('scroll', function() {		
		st = $(this).scrollTop();
		if (st < lastScrollTop) {
		    (!window.requestAnimationFrame) 
			? setTimeout(function(){ hideBlocks(timelineBlocks, offset); }, 300)
			: window.requestAnimationFrame(function(){ showBlocks(timelineBlocks, offset); });
		}
		else {
		    (!window.requestAnimationFrame) 
			? setTimeout(function(){ showBlocks(timelineBlocks, offset); }, 300)
			: window.requestAnimationFrame(function(){ showBlocks(timelineBlocks, offset); });
		}
		lastScrollTop = st;		
	});
	
	

	function hideBlocks(blocks, offset) {
		blocks.each(function(){
			( $(this).offset().top > $(window).scrollTop()+$(window).height()*offset ) && $(this).find('.cd-timeline-img, .cd-timeline-content').addClass('is-hidden');
		});
	}

	function showBlocks(blocks, offset) {
		blocks.each(function(){
			( $(this).offset().top <= $(window).scrollTop() + $(window).height() * offset && $(this).find('.cd-timeline-img').hasClass('is-hidden') ) && $(this).find('.cd-timeline-img, .cd-timeline-content').removeClass('is-hidden').addClass('bounce-in');
		});
	}
});

Add var lastScrollTop = 0;