thanks... You're example would replace the whole menu, which is fine if this is what you need. in my case i just have a few pages. However, you've got me thinking, and I think i'll just need to add another tickbox to the behaviour tab, and then do something like this
<ul>
<% control Menu(1) %>
<% if CurrentMember %>
<% if DontShowToLoggedInMemebers %>
<% else %>
<li><a href="$Link" title="Go to the $Title.XML page" class="$LinkingMode"><span>$MenuTitle.XML</span></a></li>
<% end_if %>
<% else %>
<li><a href="$Link" title="Go to the $Title.XML page" class="$LinkingMode"><span>$MenuTitle.XML</span></a></li>
<% end_if %>
<% end_control %>
</ul>
that should work! thanks