Rails - Apr 2008 - link via image map

I''m looking to create a small icon to use in table headings, that users
can use to sort by that table heading. Click on the top half and sort
ascending, and click on the bottom half to sort desc.

Is there a way to neatly generate an image map via Rails. I want to
create output HTML something like this:

<img src="sort.gif" usemap="#sort"
border="0">
<map name="sort">
<area shape="rect" coords="0,0,50,25"
href="http://www.site.com/stuff/list?sort=asc">
<area shape="rect" coords="0,50,50,50"
href="http://www.site.com/stuff/list?sort=desc">
</map>

I can build my own helper method to do this, but wondered if there was
already a way to do it.
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As I''ve had no reply, I guess the answer is no - there isn''t
an existing
method. I''ve thrown these helper methods together which does the job
for
me:

  def image_map_for_sort_link(name, field)
      params_for_link = params.clone
      params_for_link.delete_if{|key,value| key == ''order'' or
key ==
''sort_by''}
      output = Array.new
      output << [''<map name="'', name,
''">''].join
      output << image_map_area("0,0,20,18", url_for(:sort_by
=> field,
:params => params_for_link, :order => ''asc''))
      output << image_map_area("20,0,40,18", url_for(:sort_by
=> field,
:params => params_for_link, :order => ''desc''))
      output << ''</map>''
      return output.join("\n")
  end

  def sort_image(field="")
    map_name = "sort_#{field}"
    @image_maps = Array.new unless @image_maps
    @image_maps << image_map_for_sort_link(map_name, field)
    image_tag(''sort.png'', :usemap =>
"##{map_name}", :class =>
''image_map'')
  end

  private
  def image_map_area(coords, url)
    [''<area shape="rect" coords="'', coords,
''" href="'', url, ''"
/>''].join
  end

The result is that adding <%= sort_image(''field_name'')
-%> to a view
adds a clickable sort image, as long as I also have <%= @image_maps %> 
somewhere on the page. I also have to handle params[:sort_by] and 
params[:order] in the controller to handle the sorting.

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