/foo/result?sort=rate_down&commit=Search&search=citybedroomsis_tradeable0is_petfriendly0until_dateratebathroomsfrom_dateis_smokeaware0state

html_options = {
  :title => "Sort by this field",
  :href => url_for(:action => 'list',
  :params => @params.merge({:sort => key, :page => nil}))
}
link_to_remote(text, options, html_options)