Rails - Mar 2006 - Using render within plugin.

I am very, very new to rails (and ruby) and am working on a view 
extension helper method.  In a template I have
<%= my_helper params %>

my_helper does some system calls and ends up placing an image file in 
the public images folder (which I referenced within the plugin using 
RAILS_ROOT).  I want the helper to then return an appropriate image link 
to the template.  I want to use the image_tag method to do so, or at 
least render that within an inline template, but I don''t know how to
get
the active controller to do so.  Thanks for any help.
Brad

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