Creates password input in login form for LastPass support in Alior Bank

alior-helper.user.js

// ==UserScript==
// @name        AliorBank Helper
// @namespace   glorpen
// @include     https://aliorbank.pl/hades/do/BANKLOGIN
// @version     1
// @grant       none
// ==/UserScript==

/**
 * Creates password input for LastPass support in Alior Bank
 * @author Arkadiusz Dzięgiel
 */

var oldLogin = document.getElementById("PASSFIELD1").parentNode;
var input = document.createElement("input");

input.style.width = oldLogin.offsetWidth;
oldLogin.style.display = "none";
input.id = "alior-helper";
input.type="password";

oldLogin.parentNode.appendChild(input);

var fields = Array.prototype.slice.call(document.getElementsByClassName("logField"));

input.onchange = function(){
    for(var k in fields){
        var pos = fields[k].getAttribute("id").substr(9);
        fields[k].setAttribute("value", input.value.substr(pos-1,1));
    }
};