/**
  * Displays the admin screen
  *
  * @return void
  **/
 function admin_screen()
 {
     if (!current_user_can('edit_plugins') && !current_user_can('audit_trail')) {
         return;
     }
     // Decide what to do
     $sub = $this->submenu();
     AT_Audit::expire(get_option('audit_expiry') === false ? 30 : get_option('audit_expiry'));
     if ($sub == '') {
         $this->screen_trail();
     } else {
         if ($sub == 'options') {
             $this->screen_options();
         } else {
             if ($sub == 'support') {
                 $this->render_admin('support');
             }
         }
     }
 }