$(".book-nav-btn a").click(function(e) {
    		e.preventDefault();
    		var $this = $(this),
    			$parent = $this.parent('h4');
    		if ($parent.hasClass('closed')) {
    			$("#chapters").slideDown(800);
    			$parent.addClass('open').removeClass('closed');
    		} else {
    			$("#chapters").slideUp(800);
    			$parent.addClass('closed').removeClass('open');
    		}
    	});
    	
$(".case-study-btn a").click(function(e) {
	e.preventDefault();
	var $this = $(this),
		$parent = $this.parent('h5');
	if ($parent.hasClass('closed')) {
		$("#case-study-content").slideDown(800);
		$parent.addClass('open').removeClass('closed');
		$this.find('.current').text('(hide)');
	} else {
		$("#case-study-content").slideUp(800);
		$parent.addClass('closed').removeClass('open');
		$this.find('.current').text('(show)');
	}
		
});