Changing logout url

Hi

How can I change my logout url?

I get a problem when using WordPress 3.0 with multiuser setting. When I logout from my user, I get redirected to http://localhost/user/wp-login.php. If I then want to login as admin right away, I get logged in on the user again to the url http://localhost/user/wp-admin…

Logout path should be just http://localhost/ instead. How can I set this?