module Merb::ControllerExceptions

  def admin_access_required
    render
  end
end

In app/views/exceptions/admin_access_required.rhtml

<h1>You're not an administrator!</h1>
<p>You tried to access <%= @tried_to_access %> but that URL is 
restricted to administrators.</p>

Constants

STATUS_CODES

Mapping of status code names to their numeric value.