def link_to_active_if(condition, link_title, link_path={}, opts={})
    if condition
      classes = opts.delete(:class) || ""
      classes.rstrip!
       # checking to see if "active" is already one of the classes assigned, and if NOT, append it to the classes string (sorry, Ruby 1.8 doesn't support negative lookbehind)
      unless classes =~ /^(\w*\s+)*active(?!\w)/
        if classes.blank?
          classes = 'active'
        else
          classes << " active"
        end
      end
    end
    old_opts = opts.dup
    link_to_if(condition, link_title, link_path, opts.merge({:class => classes})){
      link_to(link_title, link_path, old_opts)
    }
  end