trim_excerpts.php

//Trm excerpt
function berglund_trim_excerpt($length) {
    global $post;
    $explicit_excerpt = $post->post_excerpt;
    if ('' == $explicit_excerpt) {
        $text = get_the_content('');
        $text = apply_filters('the_content', $text);
        $text = str_replace(']]>', ']]>', $text);
    } else {
        $text = apply_filters('the_content', $explicit_excerpt);
    }
    $text = strip_shortcodes($text); // optional
    $text = strip_tags($text);
    $excerpt_length = $length;
    $words = explode(' ', $text, $excerpt_length + 1);
    if (count($words) > $excerpt_length) {
        array_pop($words);
        array_push($words, '...');
        $text = implode(' ', $words);
        $text = apply_filters('the_excerpt', $text);
    }
    return $text;
}