Help with Complex Sign-Up Process

I have a sign-up (new user) process that is -- by convention -- split
between a new and create action.

The problem is that the the new view has several hidden divs that are
conditionally shown during the process of some Ajax callbacks. Here
is an example. During the sign-up, the user has the choice of
choosing an existing organization or entering new organization info.
So the view contains:

<%= f.collection_select("organization", @orgs, :id, :org_name,
{:include_blank => true }, { }) %>
<%= observe_field "user_organization", :url => {:action =>
"org_selected"}, :with => "org_id" %>

If the user chooses an existing organization, my org_selected Ajax
action looks like this:

    org_id = params[:org_id]
    if org_id == ""
  ...
    elsif (org_id == "-1")
  ...
    else
      @org = Organization.find(params[:org_id])
      render :update do |page|
  ....
        page.hide "new_org"
        page.show "existing_org"
        page["existing_org"].replace_html :partial =>
"existing_org_info"
      end
    end

This pattern repeats a few times (for employee position and location
-- both of which are dependent on the company choice). During an Ajax
callback, a hidden div is shown and a partial is rendered within it.
The problem I have is that when a validation error occurs in create
action after the user has filled in all these divs, I have to re-
render the new view via render action :=> new, but the divs have lost
their contents since they were partials rendered during Ajax
callbacks.

Is there a recommended way to deal with this situation?

TIA