[Zope] Logout from Zope

Hi, how can I logout from zope. I saw a solution from "Michael Long": <form action="/acl_users/logout" method="post"> <table> <tr> <td class="ToolBar_login" align="center"> <input type="submit" value="Log out" size="5"> </td> </tr> </table> </form> but I get a site error message "Resource not found". Is logout a object. Thanks for help...Patrick