/**
 * If user is adding to mailing list we can ask the lead source question, otherwise
 * it's not relevant.
 */
function addRemoveNewsletterChanged() {
    var leadSourceRow = $('leadSourceRow');
    if (leadSourceRow != null) {
        if ($('add').checked) {
            leadSourceRow.show();
        }  else {
            leadSourceRow.hide()
        }
    }
}