Unable to observe select_tag's value

Rails
1

Hi,

I am trying to observe a select_tag’s value, and insert a partial inside
the
page based on that value. Here’s the code:

#index.html.erb
<% form_tag do %>
<%= select_tag ‘product_id’,
options_from_collection_for_select(@products, ‘id’, ‘pro_name’), {:id
=> ‘product_id’} %>
<%= select_tag ‘taxation_id’,
options_from_collection_for_select(@taxations, ‘id’, ‘tax_name’), {:id
=> ‘taxation_id’} %>
<%= observe_field ‘product_id’, :url => {:controller =>
‘regulations’, :action => ‘show’}, :with => “‘id=’ + value” %>
<% end %>

#regulations_controller.rb
def show
@regulation = Regulation.find_by_product_id params[:id]

respond_to do |format|
  format.html # show.html.erb
  format.xml  { render :xml => @regulation }
  format.js
end

end

#show.js.rjs
page.alert(“you are here!”)
page.insert_html :bottom, ‘regulations’, :partial => ‘all’, :locals =>
{ :regs => @regulations }

Index.html looks like this:

joomla VAT

Is something missing or wrong in the above code? even the alert is not
getting called.

Regards

–
Sahil