Q944 In Netscape CSS can be switched off, is it possible to detect this?

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Yes its possible. Just check for a layer object before attempting to manipulate it, for example:

<script language="JavaScript"><!--
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';
}
//--></script>