Wordpress plugin to change <lj user="username"> to html in blogs

livejournal-user.php

<?php

/*
  Plugin Name: Livejournal User
  Plugin URI: http://www.begemotik.ee/LivejournalUserPlugin/
  Description: This plugin replaces <lj user="username"> with the correct html code.
  Author: Aleksei Prokopov.
  Version: 0.1
  Author URI: http://www.begemotik.ee/
 */

function parse($content)
{
    $i = 0;
    while ($i == 0)
    {
        $user       = explode('<lj user="', $content);
        $user       = explode('">', $user[1]);
        $user       = $user[0];
        $old_string = '<lj user="'.$user.'">';
        $new_string =
                '<span class="ljuser" lj:user="'.$user.'">'.
                '<a href="http://'.$user.'.livejournal.com/profile">'.
                '<img alt="[info]" height="17" src="http://p-stat.livejournal.com/img/userinfo.gif" '.
                'style="vertical-align: bottom; border: 0; padding-right: 1px;" width="17"'.
                '/></a>'.
                '<a href="http://'.$user.'.livejournal.com/"><b>'.$user.'</b>'.
                '</a></span>';
        
        $content    = str_replace($old_string, $new_string, $content);
        if ($user == '') break;
    }
    $i = 0;
    while ($i == 0)
    {
        $comm       = explode('<lj comm="', $content);
        $comm       = explode('">', $comm[1]);
        $comm       = $comm[0];
        $old_string = '<lj comm="'.$comm.'">';

        '<span class="ljuser" lj:user="'.$comm.'" style="white-space: nowrap;">'.
                '<a href="http://community.livejournal.com/'.$comm.'/profile">'.
                '<img alt="[info]" height="16" src="http://p-stat.livejournal.com/img/community.gif" '.
                'style="vertical-align: bottom; border: 0; padding-right: 1px;" width="16" /></a><a'.
                ' href="http://community.livejournal.com/'.$comm.'/"><b>'.$comm.'</b></a></span>';
        $content = str_replace($old_string, $new_string, $content);
        if ($comm == '') break;
    }
    return $content;
}

add_filter('the_content', 'parse');
add_filter('the_title', 'parse');