rating

class TeocomiRatingFieldPlugin {

    function TeocomiRatingFieldPlugin() {
    // some stuff  ...
        add_action('comment_text', array(&$this, 'DisplayRating'));
    // some stuff  ...
    }

    function DisplayAverageRating() {
        // some stuff  ...
        echo ( '...');
    }
    function DisplayRating($comment) {
        // some stuff  ...
        return $comment;
    }
}

function teocomi_rating_start() {
    $crfp = new TeocomiRatingFieldPlugin();
}

add_action( 'plugins_loaded', 'teocomi_rating_start' );

function display_avg_rating() {
    $trfp = new TeocomiRatingFieldPlugin();
    $trfp->DisplayAverageRating();
}