A plea for help

Hello all,
I am a very noobish developer-in-the-making and I am hung up on getting some eRb/HAML/CSS/etc/etc to play nice together.
Inside my _headers.html.haml file I have this:

=link_to_language "English", :en
=link_to_language "France", :fr

My Application_helper.rb has this:

  def link_to_language name, locale
    uri = URI.parse(request.fullpath)
    uri.path.gsub!(/(^\/en)|(^\/fr)|^/, "/#{locale}")
    link_to name, uri.to_s
  end
end

My application_controller.rb has this:

def set_locale
    I18n.locale = params[:locale] || request.compatible_language_from(['en', 'fr'])
  end

  def default_url_options(options={})
    { :locale => I18n.locale }
  end

And this is my CSS that I want to use:
#engbutton{
background:url(public/images/useng.gif) no-repeat;
cursor:pointer;
width: 45px;
height: 28px;
border: none;
}

#frbutton{
background:url(public/images/france.jpg) no-repeat;
cursor:pointer;
width: 45px;
height: 28px;
border: none;
}

How would I go about making the =link_to_language "" code in my .haml display the CSS images?

Any help would be great and deeply appreciated, thanks Rails community!