JS not recognized in link_to_remote respond_to?

In my view I have this test...

<%= link_to_remote('AJAX Alert', :url => '/sandbox/submit', :success
=> 'alert(request.responseText)') %>

In my controller, this works and alerts "AJAX Response"...

  def submit
    render :layout => false
  end

But if I add the respond_to block, the format.js never gets
recognized...

  def submit
    respond_to do |format|
      format.js {
        render :layout => false
      }
      format.html {
        # render normal layout
      }
    end
  end