//Newsletter signup:
function submit_newsletter() {
    if (!isValidEmail(document.NEWSLETTER.EMAIL.value)) {
        alert('Vennligst fyll inn en gyldig epost adresse.');
    } else {
        document.NEWSLETTER.submit();
    }
}

function signoff_single_letter() {
    if (!isValidEmail(document.NEWSLETTER.EMAIL.value)) {
        alert('Vennligst fyll inn en gyldig epost adresse.');
    } else {
        document.NEWSLETTER.CMD.value = 'SIGNOFF_SINGLE';
        document.NEWSLETTER.submit();
    }
}

function isValidEmail(str) {
    return (str.indexOf(".") >= 1) && (str.indexOf("@") > 0);
}

function submit_multi_newsletter() {
    var err = '';
    var checked = false;

    if (!isValidEmail(document.NEWSLETTER.EMAIL.value)) {
        err = 'Vennligst fyll inn en gyldig epost adresse.\n';
    }

    for (i = 0; i <= document.NEWSLETTER.NEWSLETTER_ID.length - 1; i++) {
        if (document.NEWSLETTER.NEWSLETTER_ID[i].checked == true) {
            checked = true;
        }
    }
    if (checked == false) {
        err = err + 'Ingen nyhetsbrev er valgt.';
    }

    if (err != '') {
        alert(err);
        return false;
    }

    document.NEWSLETTER.submit();

    return;

}

function signoff_multi_letter() {
    var err = '';
    var checked = false;

    if (!isValidEmail(document.NEWSLETTER.EMAIL.value)) {
        err = 'Vennligst fyll inn en gyldig epost adresse.\n';
    }

    for (i = 0; i <= document.NEWSLETTER.NEWSLETTER_ID.length - 1; i++) {
        if (document.NEWSLETTER.NEWSLETTER_ID[i].checked == true) {
            checked = true;
        }
    }
    if (checked == false) {
        err = err + 'Ingen nyhetsbrev er valgt.';
    }

    if (err != '') {
        alert(err);
        return false;
    }

    document.NEWSLETTER.CMD.value = 'SIGNOFF_MULTI';
    document.NEWSLETTER.submit();

    return;
}