#Place this code in your application_helper.rb
    def sortable(column, title = nil)
      title ||= column.titleize
      css_class = column == sort_column ? "#{sort_direction}" : nil
      direction = column == sort_column && sort_direction == "asc" ? "desc" : "asc"
      
      if css_class == "asc"
        header_class = "headerSortDown"
      elsif css_class == "desc"
        header_class = "headerSortUp"
      end
      
      content_tag("th", title, :"data-link" => url_for(params.merge(:sort => column, :direction => direction, :page => nil)), :class => "header multiSort #{header_class}")
        
    end