$(document).ready(function(){

	$("section article").hide();
	$("section h3").hide();

	$("section article:first").show();
	$("nav ul li:first").addClass("active");

	$("nav ul li a").click(function(){
		$('nav ul li').removeClass("active");
		$(this).parent().addClass("active");

		var current = $(this).attr("href");

		$("section article:visible").fadeOut("fast");

		$("section").animate({"height":$(current).height()},function(){
			$(current).fadeIn("fast");
		});

		return false;
	});
});