compwright/popup.php

## popup.php
<script type="text/javascript">

	// Configure these settings in your config/application.php file:
	// $config['fb_page_url'] = 'https://www.facebook.com/yourfacebookpage';
	// $config['fb_app_id'] = '12345667890825978';
	var top_frame_url = '<?php echo config_item('fb_page_url'); ?>/app_<?php echo config_item('fb_app_id'); ?>';

<?php if (isset($_COOKIE['PHPSESSID'])): ?>
	// @HACK: pop-up a window if the page is clicked (anywhere) which will access the
	// host domain so we can set cookies in Safari
	// http://www.digitalwks.com/blogs/diogo-raminhos/facebook-safari-session-problem-safari-iframe-set-cookie/
	$(function() {
		$('body').click(function() {
	  		var win = window.open('<?php echo site_url("/start_session"); ?>', 'cookie_window', 'height=640,width=480,location=0,menubar=0,resizable=0,scrollbars=0,status=0,titlebar=0,toolbar=0');
			win.blur(); // pop under the main window
			var poller = setInterval(
	  			function()
				{
					if(win.closed !== false) { // !== is required for Opera
						clearInterval(poller);
						window.top.location = top_frame_url;
					}
				},
				300
			);
		});
	});
<?php endif; ?>

</script>

## start_session.php
<?php

class Start_session extends CI_Controller
{
	public function index()
	{
		if ( ! isset($_SESSION))
		{
			session_start();
		}

		echo <<<HTML
<script type="text/javascript">window.close();</script>
<noscript>You may close this window now.</noscript>
HTML;

		exit;
	}
}
	<?php

	class Start_session extends CI_Controller
	{
	public function index()
	{
	if ( ! isset($_SESSION))
	{
	session_start();
	}

	echo <<<HTML
	<script type="text/javascript">window.close();</script>
	<noscript>You may close this window now.</noscript>
	HTML;

	exit;
	}
	}