RuTracker Search button on MAL - userscript [user.js]

// ==UserScript==
// @name        RuTracker Search button on MAL
// @namespace   namespace
// @include     *myanimelist.net/anime/*/*
// @version     1
// @grant       none
// ==/UserScript==

var a = document.createElement('a')
document.getElementById('contentWrapper').getElementsByClassName('h1')[0].appendChild(a)
a.textContent = " - RuTracker Search"
a.target = '_blank'
a.href = 'http://rutracker.org/forum/tracker.php?nm='+document.getElementById('contentWrapper').getElementsByClassName('h1')[0].childNodes[0].textContent