[support] How to hide Navigation menu for non-authenticated users?

[Jody Cleveland]

Thank you!! That worked great.

> In the custom block options for the Navigation menu, you'd be able to 
> use PHP code to determine whether to actually display it. 
> Something like 
> this would tend to work (untested):
> 
>   <?php
>     global $user;
>     return $user->uid ? TRUE : FALSE;
>   ?>
> 
> What this is saying is:
> 
>   * load in the special Drupal object $user.
> 
>   * if the user's user ID exists ($user->uid), then it is
>     TRUE that we want to display this block. If it doesn't
>     exist (in the case of an unauthenticated viewer), then
>     it is not true (FALSE) that we want to display the block.

- jody