<%= error_messages_for 'category' %>

<!--[form:category] Jowy
<p><label for="category_name">Name</label><br/>
<%= text_field 'category', 'name'  %></p>
<p><label for="category_parent_id">Parent Category</label><br/>
<%= render :partial => 'category_select', :locals => {:id => "category_parent_id"} %></p>
<div id="box"></div>

<%= javascript_tag("$('category_parent_id').onchange = function(){"+remote_function(:update => :box,:url => {:action => :root_change}, :with => "'id='+$F('category_parent_id')")+"}") %>

<!--[eoform:category]-->

<!--[form:photo]-->

-----------------------------------------------------------------------------------------------------
** from _category_select.rhtml partial **
<%= collection_select(:category, :parent_id,
@all_categories, :id, :name,{},{:size => 5, :multiple => "multiple", :id => id, :name => id}) %>
<%= javascript_tag("$('"+id+"').onchange = function(){" + remote_function(
    :url => {:action => :category_text_field },
    :with => "'id='+ $F('"+id+"')")+"}")  %>

** from categories_controller **
	 def category_text_field
    @cat = Category.find(params[:id])
    @all_categories = @cat.children
    render :update do |page|
      page.insert_html :bottom, 'box', render(:partial => "category_select", :locals => {:id => "category[selected_#{@cat.id}]"})
    end
  end