function Left(str, n) {
    if (n <= 0)
        return "";
    else if (n > String(str).length)
        return str;
    else
        return String(str).substring(0, n);
}
function toggle(obj) { var el = document.getElementById(obj); if (el.style.display != 'none') { el.style.display = 'none' } else { el.style.display = 'block' } }
function CatID(ID) { }