function showSubMenu() {
    document.getElementById('sub-box').style.visibility = 'visible';
}

function hideSubMenu() {
    document.getElementById('sub-box').style.visibility = 'hidden';
}

function showSubBar() {
    document.getElementById('sub-bar').style.visibility = 'visible';
    document.getElementById('empty-bar').style.visibility = 'hidden';
}

function hideSubBar() {
    document.getElementById('sub-bar').style.visibility = 'hidden';
    document.getElementById('empty-bar').style.visibility = 'visible';
}

function dark(id) {
    document.getElementById(id).className = 'sub-list-dark';
}

function light(id) {
    document.getElementById(id).className = 'sub-list';
}


function loader() {

}

function checkAll(form)
{
    answer = true;
    msg = '';

    if (form.name.value=='')
    {
        answer = false;
        msg = msg + "\n<li>Wprowadź imię i nazwisko</li>";
    }

    if (!form.email.value.match(/^[a-zA-Z0-9._\-]{1,30}@[a-zA-Z0-9._\-]+(\.[a-zA-Z0-9._\-]+)+$/))
    {
        answer = false;
        msg = msg + "\n<li>Wprowadź poprawny adres email</li>";
    }

    if (form.tel.value=='' || form.tel.value=='Wprowadź numer telefonu')
    {
        answer = false;
        msg = msg + "\n<li>Podaj numer telefonu</li>";
    }

//    if (form.ext.value=='')
//    {
//        answer = false;
//        msg = msg + "\nWprowadź treść wiadomości<br />";
//    }

    if (form.cv.value==false)
    {
        answer = false;
        msg = msg + "\n<li>Podaj lokalizację pliku cv</li>";
    }

    if (msg != '')
        msg = '<p><strong>Formularz wypełniony błędnie.</strong><ul>' + msg + '</ul></p>';

    document.getElementById('errors').innerHTML = msg;
    return answer;
}