function highlight(obj, className) { obj.className = className; }

function show(divname) {
    if($(divname)) {
        $(divname).setStyle('display', 'block');
        return true;
    }

    return false;
}

function hide(divname) {
    if($(divname)) {
        $(divname).setStyle('display', 'none');
        return true;
    }

    return false;
}