Rails - Jan 2008 - link_to that sends multi-level params

How can I use a link_to that will send multi-level params?  I need to be
able to use the following in the controller:

  params[:sales_order][:id]

Here''s the link_to I currently have:

  link_to sales_order.id.to_s, :action => ''show'', :id =>
sales_order.id

But that just gives me this in the controller:

  params[:id]

Is it possible to do what I''m wanting?

Thanks!
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Allright, I think I figured out how to do this.  Maybe it can help 
someone else:

  link_to sales_order.id.to_s, :action => ''show'',
:sales_order => {:id
=>                             sales_order.id}


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