(function($) {

var $window = $(window),
	$body = $('body'),
	$explained = $('#explained', $body),
	$overlay = $('<div/>')
		.append(
			$('<a href="#">(Close)</a>')
				.click(function() {
					$body.removeClass('show-explained');
					return false;
				})
		)
		.append($('iframe', $explained))
		.appendTo($explained)
	,
	$cover = $('<div id="cover"/>')
		.appendTo($body);
;

$('figcaption>a', $explained)
	.click(function() {
		$body.addClass('show-explained');
		$overlay.css('top', ($window.scrollTop() + ($window.height() / 2) - ($overlay.height() / 2)) + 'px');
		return false;
	})
;

})(jQuery);