title: Wordpress admin_menu
body: <p>I am trying to create an admin menu for my plugin. </p>
  
  <pre><code>$my_hook = add_menu_page( 
                     'String',
                     'String', 
                     'manage_options',
                     'mypage&amp;type=mytype', 
                     'my_function'
                      );   
  </code></pre>
  
  <p>If i try to acces the page now at </p>
  
  <pre><code>wp-admin/admin.php?page=mypage&amp;type=mytype 
  </code></pre>
  
  <p>via the menu, i get: "You do not have sufficient permissions to access this page.". Is it not possible to include GET parameters like &amp;type=mytype in the menu entry? </p>
  
  <p>Thanks.</p>