// Check for required fields
function checkFields() {
    var form = document.getElementById("quoteForm");
    if (form['name'].value.length == 0) {
        alert('Please enter a valid name.');
        form['name'].focus();
        return false;
    }
    else if (form['email'].value.length == 0) {
        alert('Please enter a valid email address.');
        form['email'].focus();
        return false;
    }
    return true;
}

document.getElementById("quoteForm").onsubmit = checkFields;