function getItem(id) {
    var itm = false;
    if (document.getElementById)
        itm = document.getElementById(id);
    else if (document.all)
        itm = document.all[id];
    else if (document.layers)
        itm = document.layers[id];

    return itm;
}

function toggleItem(id) {
    itm = getItem(id);

    if (!itm)
        return false;

    if (itm.style.display == 'none')
        itm.style.display = 'block';
    else
        itm.style.display = 'none';

    return false;
}