AJAX: close post when another one opens

I want it so that when you click to open an excerpt post or the main post, any other post on the page closes (so that a user cant have many posts open at the same time). That or have AJAX load all posts in the top left corner. How would I modify my AJAX code for https://farmball.com/boston?

<?php

function cfct_ajax_post_content($post_id) {
	global $post, $posts, $wp_query, $wp;
	$posts = get_posts('include='.$post_id);
	$post = $posts[0];
	if (is_null($post)) {
		$posts = get_pages('include='.$post_id);
		$post = $posts[0];
	}
	if (is_null($post)) {
		$posts = get_posts('post_status=private&include='.$post_id);
		$post = $posts[0];
		if ($post) {
			$user = wp_get_current_user();
			if (!$user->ID || $user->ID != $post->post_author) {
				$post = null;
			}
		}
	}
	if (!$post) {
		die('');
	}
	$wp_query->in_the_loop = true;
	setup_postdata($post);
	remove_filter('the_content', 'st_add_widget');
	$wp->send_headers();
	cfct_content();
	echo '<div class="close" id="post_close_'.$post_id.'"><a href="#">'.__('Close', 'carrington').'</a></div>';
}

function cfct_ajax_load() {
	if (isset($_GET['cfct_action'])) {
		switch ($_GET['cfct_action']) {
			case 'post_content':
			case 'post_comments':
				if (isset($_GET['id'])) {
					$post_id = intval($_GET['id']);
				}
				else if (isset($_GET['url'])) {
					$post_id = url_to_post_id($_GET['url']);
				}
				if ($post_id) {
					call_user_func('cfct_ajax_'.$_GET['cfct_action'], $post_id);
					die();
				}
		}
	}
}
?>