I'm trying to 'ajaxify' commenting in WordPress using this tutorial Ajaxify WordPress Comments

Here is my PHP handler:

function ajaxify_comments( $comment_ID, $comment_status ){

    if( ! empty( $_SERVER['HTTP_X_REQUESTED_WITH'] ) && strtolower( $_SERVER['HTTP_X_REQUESTED_WITH'] ) == 'xmlhttprequest' ) {

        //If AJAX Request Then

        switch( $comment_status ) {

            case '0':

                //notify moderator of unapproved comment

                wp_notify_moderator( $comment_ID );

            case '1': //Approved comment

                echo success;

                $commentdata = &get_comment( $comment_ID, ARRAY_A );

                $post = &get_post( $commentdata['comment_post_ID'] );

                wp_notify_postauthor( $comment_ID, $commentdata['comment_type'] );

                break;

            default:

                echo error;

        }

        exit;

    }

}

add_action( 'comment_post', 'ajaxify_comments', 20, 2 );

And here is my script:

jQuery('document').ready(function($){

    var commentform=$('#commentform'); // find the comment form

    commentform.prepend('<div id=comment-status ></div>'); // add info panel before the form to provide feedback or errors

    var statusdiv=$('#comment-status'); // define the infopanel



    commentform.submit(function(){

        //serialize and store form data in a variable

        var formdata=commentform.serialize();

        //Add a status message

        statusdiv.html('<p>Processing...</p>');

        //Extract action URL from commentform

        var formurl=commentform.attr('action');

        //Post Form with data

        $.ajax({

            type: 'post',

            url: formurl,

            data: formdata,

            error: function(XMLHttpRequest, textStatus, errorThrown){

                statusdiv.html('<p class=ajax-error >You might have left one of the fields blank, or be posting too quickly</p>');

                                },

            success: function(data, textStatus){

                if(data==success)

                    statusdiv.html('<p class=ajax-success >Thanks for your comment. We appreciate your response.</p>');

                else

                    statusdiv.html('<p class=ajax-error >Please wait a while before posting your next comment</p>');

                    commentform.find('textarea[name=comment]').val('');

                                }

                });

                return false;

        });

});

Every time I post a comment, I get: Please wait a while before posting your next comment. Hoping somebody can tell me what I'm doing wrong?