chained collection_selects RJS

Hi there I´m trying to get working a bunch of chained
collection selects

so it is like this
from 2 collection selects I replace 2 divs (just text) and
generate 2  
more collections selects depeneding on the results from the
first 2,  
but then I need to generate to more collection selects, but
it fails,  
since when the page is loaded the collection to generete the 

collection_select is not net created (it comes from the past
2)  
collection selects, I´m kind of lost of how to solve this
problem.
does anyone have a tip that could I borrow

I´m using rjs to update  multiple divs  and I´ve tried
       render :update do |page|
         page.replace_html 'apDiv5', nfc[0].name
         page.replace_html 'apDiv9', nfc[1].name
         page.replace 'apDiv11', :partial => 'ter',
:collection => nfc
       end

but apDiv11 does not work (i have tried replace and
replace_html)

the _ter.html.erb has
<%= f.collection_select :key_word ..... %>

also I have tried
         page.replace_html 'apDiv10',
         ' <select id="perro_gato"
name="perro[gato]"><option  
value="1">1</option>
           <option
value="4">4</option></select>
         '
and it works but there has to be a better solution, and it
doesnt  
solve me the problem of the later collection not existing
when the  
page is loaded


thanks in advance
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