function svalert_helper(svalert_status) {
    if (svalert_status) {
        alert('Alert message has been sent.');
    } else {
        alert('Max alert demonstrations met. Please try again later.');
    }
}

function svalert_invalid() {
    alert('Please provide a name, email address and phone number.');
}

function send_svalert(tname, temail, tnumber, tformat, svalert_script, svalert_callback) {

if (tname === undefined || tname == '') {
    svalert_invalid();
    return false;
}

if (temail === undefined || temail == '') {
    svalert_invalid();
    return false;
}

if (tnumber === undefined || tnumber == '') {
    svalert_invalid();
    return false;
}

if (tformat === undefined || tformat == '') {
    tformat = '0';
}

if (svalert_script === undefined) {
    svalert_script = 'svbtn/svalert.php';
}

if (svalert_callback === undefined) {
    svalert_callback = svalert_helper;
}

$.getJSON(svalert_script + '?jsoncallback=?', {
    number: tnumber,
    email: temail,
    name: tname,
    format: tformat },
function(data) {
    if (data.status=='OK') {
        svalert_callback(true);
    } else if (data.status=='NOT OK') {
        svalert_callback(false);
    }
});
}

function svdemocall() {
send_svalert($('#demoName').val(), $('#demoEmail').val(), $('#demoPhone').val(), $('#demoFormat').val());
}