(function ($) {

	$(function(){

		// fix sub nav on scroll
		var $win = $(window),
				$nav = $('.subnav'),
				navHeight = $('.navbar').first().height(),
				navTop = $('.subnav').length && $('.subnav').offset().top - navHeight,
				isFixed = 0;

		processScroll();

		$win.on('scroll', processScroll);

		function processScroll() {
			var i, scrollTop = $win.scrollTop();
			if (scrollTop >= navTop && !isFixed) {
				isFixed = 1;
				$nav.addClass('subnav-fixed');
			} else if (scrollTop <= navTop && isFixed) {
				isFixed = 0;
				$nav.removeClass('subnav-fixed');
			}
		}

	});

})(window.jQuery);