Rails - Dec 2008 - Observe_field

Hi Friends.
Its me newb having one Problem.
I have 3 dynamic dropdown menus.

select Company => select Department => Select Role.

I done this using Observe_field.
Its all works fine in Firefox.
But not in IE7
What would be the Problem.
Pls Assist Me.
Thanks ...


Here starts my code


<% remote_form_for( :userinfo, userinfo,:url => { :action =>
''add'' },
                           :html => { :id =>
''userCreateForm'' } ) do |f|
%>


<div class=''Field''>
   <label> Login :</label>
   <div class=''FieldInput''> <%= f.text_field :login
%> </div>

    <div class=''FieldError''>
      <%= error_message_on( userinfo, :login ) -%>
    </div>
</div>

<div class=''Field''>
    <label>Company :</label>
    <div class=''FieldInput''>
    <select id=''userinfo[company_id]''
name=''userinfo[company_id]''>
    <option id=''company-option''>Select Company
</option>
    <%= options_from_collection_for_select( CompanyInfo.find(
:all),"id","company_name" ) %>
    </select>
    <%= observe_field("userinfo[company_id]",
        n => "changed",
        :update => "userinfo[department_id]",
        :url => {:action => :update_department},
        :with => "''company_id=''+value") %>

    </div>

   <div class=''Field''>
   <label> Department </label>
   <div class=''FieldInput''>
   <select id=''userinfo[department_id]''
name=''userinfo[department_id]''>
      <option>Select Department </option>
      <%= render( :partial => ''departments'', :object
=> @departmentinfo,
                   :locals => { userinfo => nil}  ) if @departmentinfo
%>
   </select>

    <%= observe_field("userinfo[department_id]",
        n => "changed",
        :update => "userinfo[role_id]",
        :url => {:action => :update_roles},
        :with => "''department_id=''+value") %>
  </div>

  <div class=''Field''>
  <label> Role </label>
    <div class=''FieldInput''>
    <select id=''userinfo[role_id]''
name=''userinfo[role_id]''>
      <option>Select Role </option>
      <%= render( :partial => ''roles'', :object =>
@rolesinfo,
                                :locals => { :userinfo => nil}  ) if
@rolesinfo %>
   </select>
  </div>
<% end %>
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