Jake Spurlock

function author_bio_display($content)
{
    // this is where we'll display the bio

    $options['page'] = get_option('bio_on_page');
    $options['post'] = get_option('bio_on_post');

    if ( (is_single() && $options['post']) || (is_page() && $options['page']) )
    {
        $bio_box =
        '<div id="author-bio-box">
            '.get_avatar( get_the_author_meta('user_email'), '80' ).'
            <span class="author-name">'.get_the_author_meta('display_name').'</span>
            <p>'.get_the_author_meta('description').'</p>
            <div class="spacer"></div>
        </div>';

        return $content . $bio_box;
    } else {
        return $content;
    }
}