app/helpers/search_helper.rb
module SearchHelper
def link_with_search(name, search, html_options = {})
is_current = (@q and search.all? { |k,v| @q.send(k) == v })
if is_current
html_options[:class] = [html_options[:class], "current"].compact.join(" ")
end
link_to name, params.deep_merge("q" => search,:page => 1), html_options
end
end