Logout link in layout

I'd like to put a logout link in my default layout. The link should be
there only when a user has already logged in.
I put the following code in my app/views/layouts/default.ctp:

if ($this->Auth->user())
echo $html->link('Logout', array('controller' => 'Users',
'action'=>'logout'));

but, of course, cake didn't like and screamed in horror:

Notice (8): Undefined property: View::$Auth [APP/views/elements/
logout.ctp, line 3]

Fatal error: Call to a member function user() on a non-object in /app/
views/elements/logout.ctp on line 3

Is there a way to accomplish that?

Thank you and Merry Christmas!

maxx

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