MktoForms2 :: Field Confirmation

HTML

<script src="//app-sj01.marketo.com/js/forms2/js/forms2.min.js"></script>
<form id="mktoForm_169"></form>
<script>MktoForms2.loadForm("//app-sj01.marketo.com", "410-XOR-673", 169,
function(form) 
{

    //  tag all outer wrapper DIVs with their inner inputs' names to make them more findable
    for ( var formEl = form.getFormElem()[0], formRows = formEl.querySelectorAll('.mktoFormRow'), i = 0, imax = formRows.length, wrappedField; i < imax; i++ ) 
    {    
        if ( (wrappedField = formRows[i].querySelector('INPUT,SELECT,TEXTAREA')) && wrappedField.name) 
        {
            formRows[i].setAttribute('data-wrapper-for', wrappedField.name);
        }
    }
    
    // clone the Email field wrapper
    var emailWrapper = formEl.querySelector('.mktoFormRow[data-wrapper-for="Email"]');
    var emailConfirmWrapper = emailWrapper.cloneNode(true);
    
    // set some strings
    var emailConfirmFieldName = 'emailConfirm', 
        emailConfirmFieldSelector = '#'+emailConfirmFieldName,
        emailConfirmFieldLabel = 'Email Confirmation',
        emailConfirmValidationError = 'Email and confirmation must match!';
    
    // change some attributes before injecting
    emailConfirmWrapper.setAttribute('data-wrapper-for', emailConfirmFieldName);
    emailConfirmWrapper.querySelector('INPUT').name = emailConfirmWrapper.querySelector('INPUT').id = emailConfirmFieldName;
    emailConfirmWrapper.querySelector('.mktoFormCol').className = 'mktoFormCol'; // fixes bug when cloning mandatory field
    emailConfirmWrapper.querySelector('LABEL').innerHTML = emailConfirmFieldLabel;

    // add to form 
    formEl.insertBefore(emailConfirmWrapper,emailWrapper.nextSibling);
    
    // compare Email and emailConfirm before submitting
    form.onValidate(function(valid) 
    {
    
    form.showErrorMessage("Please provide a valid email address.. 1081 ", "#Email");
    
    
        if ( form.vals().Email == emailConfirmWrapper.querySelector(emailConfirmFieldSelector).value ) 
   ...