Header Scroll Sticky

    // Ref: https://www.elementcycles.net/
		// Hide header on scroll down, show on scroll up
		var did_scroll;
		var last_scroll_top = 0;
		var trigger_height = 5;
		var navbar_height = $('.global-header').outerHeight();

		$(window).scroll(function() {
			did_scroll = true;
		});

		var set_interval = setInterval(function() {
		    if (did_scroll) {
		        hasScrolled();
		        did_scroll = false;
		    }
		}, 250);

		function hasScrolled() {
			var scroll_top = $(this).scrollTop();
		    // Make sure they scroll more than trigger_height
		    if(Math.abs(last_scroll_top - scroll_top) <= trigger_height)
		        return;

		    // If they scrolled down and are past the navbar, add class .nav-up.
		    // This is necessary so you never see what is "behind" the navbar.
		    if (scroll_top > last_scroll_top && scroll_top > navbar_height && !$('html').hasClass('large-sub-menu-open')) {
		        // Scroll Down
		        $('.global-header').addClass('nav-up');
		    } else {
		        // Scroll Up
		        if(scroll_top + $(window).height() < $(document).height()) {
		            $('.global-header').removeClass('nav-up');
		        }
		    }

		    last_scroll_top = scroll_top;
		}