NAC Authenticate auto script for KMITL

kmitl_nac_auth.js

// ==UserScript== 
// @name Login KMITL 
// @namespace http://userscripts.org/users/useridnumber 
// @include https://nac.kmitl.ac.th/dana-na/auth/url_default/welcome.cgi?p=failed
// @include https://nac.kmitl.ac.th/dana-na/auth/url_default/welcome.cgi*
// @include https://nac.kmitl.ac.th/dana-na/auth/welcome.cgi* 
// @include https://nac.kmitl.ac.th/dana/home/infranet.cgi* // ==/UserScript==
function Check_Login() {
    if (document.location.href == logedinURL) {
        var new_obj = document.getElementById('liveclock2').childNodes[2].textContent;
        var hours = parseInt(new_obj.substring(2, 4));
        if (hours <= 4) {
            document.getElementById('Extendbg').click();
        }
    } else {}
}

var setURL = 'https://nac.kmitl.ac.th/dana-na/auth/url_default/welcome.cgi';
var sesionURL = 'https://nac.kmitl.ac.th/dana-na/auth/welcome.cgi?p=extend-session';
var logedinURL = 'https://nac.kmitl.ac.th/dana/home/infranet.cgi';
var foff = 'https://nac.kmitl.ac.th/dana-na/auth/url_default/welcome.cgi?p=forced-off';

window.addEventListener('load', function() {
    if (document.location.href == setURL ||
        document.location.href == foff ||
        document.location.href == sesionURL) {
        document.forms[0].elements[1].value = '<user>';
        document.forms[0].elements[2].value = '<password>';
        document.forms[0].submit();
    }
}, false);

if (document.URL.indexOf("/welcome.cgi?p=failed") >= 0) {
    document.querySelector('btnSubmit').click();
}

var checked = function() {
    Check_Login();
};
window.setInterval(checked, 5000);