(function($) {
	$(function() {
		var html$ = $("html");
		var window$ = $(window);

		var triggerHeight = $("#homepage > header nav").offset().top;

		var isFixed = false;
	
		function scrollHandler(e) {
			if (window$.scrollTop() >= triggerHeight) {
				if (!isFixed) {
					isFixed = true;
					html$.addClass("fixed-header");
				}
			}
			else {
				if (isFixed) {
					isFixed = false;
					html$.removeClass("fixed-header");
				}
			}
		}
	
		window$.scroll(scrollHandler).trigger("scroll");
	});
}(jQuery));