JavaScript

<script src="jquery.ba-hashchange.js"></script>
<script>
(function($){
	$(function(){
	
		$(window).hashchange(function(){
				var hash = location.hash;
				console.log(hash);
				$('#mainNav a').each(function(){
					if ($(this).attr('href') == hash) {
						$(this).addClass('current');
					} else {
						$(this).removeClass('current');
					}
			});
		})
		$(window).hashchange();	

	});	
})(jQuery);
</script>