partner-flights.user.js

// ==UserScript==
// @name         ANA International Partner Space Hack
// @namespace    http://spondooliks.org/userscripts
// @description  Allow an ANA member with no miles to search for Partner Award Space
// @match http://*.ana.co.jp/*
// @match https://*.ana.co.jp/*
// ==/UserScript==

var elements = document.getElementsByClassName('btnRArrGrayL');

var replace = [
  {
    name : "buttons.starTicketButton",
    value : "Use Star Alliance Members"
  },
  {
    name : "buttons.careerTicketButton",
    value : "Use the Single Airline"
  },
];

[0, 1].forEach(function(index) {
  var input = document.createElement('input');
  input.setAttribute('type', 'submit');
  input.setAttribute('name', replace[index].name);
  input.setAttribute('value', replace[index].value);
  input.setAttribute('class', 'btnBlueL');

  var button = elements[0]; // always 0-indexed since button nodes get removed from the DOM.
  button.parentNode.replaceChild(input, button);
});