def role_facet(role, current_roles, facet)
    string = ''
    current = true if current_roles.include?(role.name)
    string << "<strong>" if current
    string << link_to("#{role.display_name.localize} (" + facet.count.to_s + ")", url_for(params.merge(:page => nil, :role => (current_roles << role.name).uniq.join(' '), :view => nil)))