addLoadListener(init);

function init() {
    var nojs = document.getElementById("nojs");
    nojs.className = "nodisp";
    var opt = document.getElementById("optnew");
    opt.className = "hidden";
    var newu = document.getElementById("newu");
    newu.onclick = toggleOptional;
    toggleOptional();
}

function toggleOptional() {
    var newu = document.getElementById("newu");
    var opt = document.getElementById("optnew");
    if (newu.checked)
        opt.className = "";
    else
        opt.className = "hidden";
}