Open sblocks (rpg.net)

If spoiler blocks are present on an rpg.net page, then two further buttons are overlaid on the page to show/hide all the spoilers.

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// ==UserScript==
// @name            Open sblocks (rpg.net)
// @version         1
// @description     If spoiler blocks are present on an rpg.net page, then two further buttons are overlaid on the page to show/hide all the spoilers.
// @namespace       http://forum.rpg.net/phil6294
// @include         http://forum.rpg.net/*
// @grant           none
// ==/UserScript==

window.showSblocks = function () {
  var sb = document.getElementsByTagName('input');
  for (var i = 0; i < sb.length; i++){
   if (sb[i].type == 'button' && sb[i].value == 'Show') {
     sb[i].click();
}}}

window.hideSblocks = function () {
  var sb = document.getElementsByTagName('input');
  for (var i = 0; i < sb.length; i++){
   if (sb[i].type == 'button' && sb[i].value == 'Hide') {
     sb[i].click();
}}}

var sb = document.getElementsByTagName('input');
var c = 0;
for (var i = 0; i < sb.length; i++) {
   if (sb[i].type == 'button' && sb[i].value == 'Show') {
     c++;
}}

if (c > 0) {
  var zNode = document.createElement ('div');
  zNode.innerHTML = '<button id="myButton" type="button" onClick="window.showSblocks();" style="position: fixed; top: 20px; right:0px; z-index: 200;">Show sblocks</button>';
  document.body.appendChild (zNode);
  zNode = document.createElement ('div');
  zNode.innerHTML = '<button id="myButton" type="button" onClick="window.hideSblocks();" style="position: fixed; top: 50px; right:0px; z-index: 200;">Hide sblocks</button>';
  document.body.appendChild (zNode);
}