how would I add a comment box to "allcomments.php" in "rivercomments"?  I would really like it if I could have it look just like the comment box in "rivercomments"

<?php
    /**
    * river_comments
    *
    * @author Pedro Prez
    * @link http://community.elgg.org/pg/profile/pedroprez
    * @copyright (c) Keetup 2010
    * @link http://www.keetup.com/
    * @license GNU General Public License (GPL) version 2
    */

    // Get the Elgg engine
    require_once(dirname(dirname(dirname(__FILE__))) . "/engine/start.php");
    $callback = get_input('callback');
    $entity_guid = get_input('guid');
   
    if ($callback && !isloggedin()) {
        echo 'loginerror';
        exit;
    } else {
        gatekeeper();
    }
   
   
    $entity = get_entity($entity_guid);
    if (!$entity) {
        forward($_SERVER['HTTP_REFERER']);
    }
   
    $title = "";
    if ($entity instanceof ElggUser || $entity instanceof ElggGroup) {
        $title = $entity->name;
    } else {
        if ($entity instanceof ElggObject && $entity->getSubtype()=='thewire') {
            $title = $entity->description;   
        } else {
            $title = $entity->title;
        }
    }
   
    $title = sprintf(elgg_echo('river_comments:allcommentsof'), $title);
   

 
   
    $comments_count = (int) count_annotations($entity_guid, "", "", 'generic_comment');
   
    if(!$callback) {
        $content = list_annotations($entity_guid, 'generic_comment', $comments_count);
    } else {
        $comments_offset = 0;
        $comments_limit = $comments_count;
        if ($comments_count > 2) {
            $comments_limit -= 2; 
        }
        $comments = get_annotations($entity_guid, "", "", 'generic_comment', "", "", $comments_limit, $comments_offset);
        foreach($comments as $comment) {
            $owner = get_user($comment->owner_guid);
            $content .= elgg_view('river_comments/river_comment', array(
                'owner' => $owner,
                'annotation' => $comment
            ));
        }
       
    }   
   
    if (!$callback) {
        $content = elgg_view_layout('two_column_left_sidebar', '', elgg_view_title($title) . $content);
        page_draw($title, $content);
    } else {
        echo $content;
    }

I want to add the comment box from the river

to the allcomments.php in "rivercomments"