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