Apple support download ez nav

KBDL.user.js

// ==UserScript==
// @name         KBDL
// @namespace    https://cecekpawon.github.io/
// @version      0.2
// @description  Apple support download ez nav
// @author       cecekpawon
// @match        https://support.apple.com/kb/DL*
// @grant        none
// ==/UserScript==

(function() {
  'use strict';

  var
    main = document.getElementById('main')/*,
    errorbox = document.getElementById('errorbox')*/;

  if ((main != null) /*&& (errorbox == null)*/) {
    var
      style = '.ywrap { padding: 20px 0; text-align: left; }' +
        '.ywrap > * { color: white; border-radius: 5px; display: inline-block; font-weight: bold; line-height: 17px; }' +
        '.ynav { background-color: black; cursor: pointer; font-size: 13px; position: relative; }' +
        '.ynavl { padding: 5px 10px 5px 5px; }' +
        '.yinfo { z-index: 1; position: relative; font-size: 22px; background-color: red; padding: 7px 10px; margin-left: -5px; border: solid 2px white; top: 10px; }' +
        '.ynavr { margin-left: -5px; padding: 5px 5px 5px 10px; top: 20px; }',
      kburl = 'https://support.apple.com/kb/DL',
      css = document.createElement('style'),
      id = parseInt(document.URL.match(/\/DL(\d+)/i)[1]),
      wrap = document.createElement("div"),
      div1 = document.createElement("div"),
      div2 = document.createElement("div"),
      div3 = document.createElement("div");

    css.type = 'text/css';
    if (css.styleSheet) css.styleSheet.cssText = style;
    else css.appendChild(document.createTextNode(style));
    document.getElementsByTagName('head')[0].appendChild(css);

    wrap.className = "ywrap";
    div1.className = "ywrapc ynav ynavl";
    div2.className = "ywrapc yinfo";
    div3.className = "ywrapc ynav ynavr";

    div1.appendChild(document.createTextNode("<"));
    div2.appendChild(document.createTextNode(id));
    div3.appendChild(document.createTextNode(">"));

    div1.onclick = function(e) { document.location = kburl + (id - 1).toString(); };
    div3.onclick = function(e) { document.location = kburl + (id + 1).toString(); };

    wrap.appendChild(div1);
    wrap.appendChild(div2);
    wrap.appendChild(div3);

    //main.appendChild(wrap);
    main.insertBefore(wrap, main.firstChild);
  }

})();

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