Rails - Jul 2006 - Modifying URLs

I''d like to be able to take a URL and add or modify a param, just like 
url_for does in ActionController.

However, I''d like to be able to do this for a URL taken as a string, 
without a controller behind it.  So I can''t just call url_for.

Any ideas?  What''s the best way to do this?

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