Rails - Feb 2007 - Add items to select_tag?

Hi,

I have been struggling with the select tag for the last two days.  Does
anyone know how to change the content of a select_tag?  More
specifically, I have a list of items on another select_tag.  I would
like to make it so that the user can add the items into their own list.
I tried this in my controller (with KRJS plugins)

def on_item_list_dblclick
    render :update do |page|
      page[''user_list''].add = params[:dom_value]
    end
end

Changing text in a textbox is simple, but I can''t find any
documentation
about how to add to a select list.  Any help would be appreciated.
Thank you.

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It seems like page[''user_list''].add takes two arguments, both
of which
should be DOM element object.  How do I create DOM element object in 
controller?

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