Multiple Instances of the WP Text Editor in Metaboxes

function my_admin_print_footer_scripts() {
    global $post; ?>

    <script type="text/javascript">

        /* <![CDATA[ */
        jQuery.noConflict();
        jQuery(document).ready(function($) {

            var i=1;
            $('.customEditor textarea').each(function(e)
            {
                var id = $(this).attr('id');

                if (!id)
                {
                    id = 'customEditor-' + i++;
                    $(this).attr('id',id);
                }

                tinyMCE.execCommand('mceAddControl', false, id);

            });





        });


    /* ]]> */
    </script>
<?php }