Making sub selects


hey, i have a problem making subselects, i have this code and i want to
use it
in rails:

Brutyn NV Odevaere (VME res.) VME Complex Foster
Please select one of the options above first

i also use ajax for this, this is the code
<%= form_remote_tag ( :url => { :action => :new, :id => @caller_id },
:update => “div_info” ,
:complete => "
new Ajax.Updater(‘list’,’/callerids/list/,{asynchronous:true,
" ) %>
<%= render_partial ‘form’ %>
<%= submit_tag(“Create”, :id => ‘form-submit-button’) %>
<%= end_form_tag %>

Now my problem is: how can i name the remote form???
cuz i need this in my code see ‘var selbox = document.myform.geotagid;’
others. i want to use names because in the background i have also forms
searching, so i dont want to use numbers like forms[1] or forms[2].

can anyone help me?? or have any expirence in this?
later on i want to write the javascripts value with a loop for each

I have tried it with ajax, that works partial but, i selected the first
the second list is created and the i submit and the change a whole
area of the page he shouldnt do.

thx in advance