Greasemonkey userscript to add a download link to iTorrents caching service

itorrent-downloader.user.js

// ==UserScript==
// @name       BtDig.com to iTorrent
// @version    1.0
// @description  Adds link to itorrent file
// @match      https://btdig.com/*/*
// ==/UserScript==

function _x(STR_XPATH) {
    var xresult = document.evaluate(STR_XPATH, document, null, XPathResult.ANY_TYPE, null);
    var xnodes = [];
    var xres;
    while (xres = xresult.iterateNext()) {
        xnodes.push(xres);
    }

    return xnodes;
}

(function() {
    'use strict';
var child = _x('/html/body/center/div[1]/div/center/table/tbody/tr[4]/td[2]')
var downloadUrl = document.createElement('a')
downloadUrl.setAttribute('href', 'https://itorrents.org/torrent/'  + encodeURI(window.location.pathname.split('/')[1]) + '.torrent')
downloadUrl.innerHTML = '⭳ Download from iTorrents!'
child[0].append(document.createElement('br'))
child[0].append(downloadUrl)
})();