function show(w,object) {
    if (w.document.layers && w.document.layers[object] != null)
        w.document.layers[object].visibility = 'visible';
    else if (document.all)
        w.document.all[object].style.visibility = 'visible';
}
function hide(w,object) {
    if (w.document.layers && w.document.layers[object] != null)
        w.document.layers[object].visibility = 'hidden';
    else if (document.all)
        w.document.all[object].style.visibility = 'hidden';
}