Cookie shortcode to use as a default value

<?php
// shortcode to grab a cookie
// usage: [cookie name='whatever']
// paste this code into your theme's functions.php file
if (!function_exists('ch_get_cookie')) {
    function ch_get_cookie($atts) {
        extract(shortcode_atts(array(
            'name' => null
        ), $atts));
        $output = $_COOKIE[$name];
        return $output;
    }
}
add_shortcode('cookie', 'ch_get_cookie');