## helper

module FormHelper
  
    def render_tree_select(pages, name, control_id, control_name, current_selection, exclusion, blank_record)
      ret = ''    
      ret += "<select name=\""+control_name+"\" id=\""+control_id+"\">" 
      ret += "<option value=\"0\">"+blank_record+"</option>" if not blank_record.empty?
      for page in pages     
        ret += "<option value=\"" + page.id.to_s + "\" " 
        ret += "selected=\"selected\"" if current_selection == page.id
        ret += ">"
        ret += page[name] if page[name]
        ret += "</option>"
        ret += recurse_tree(page, 0, name, current_selection, exclusion) if page.children.size > 0 
      end 
      ret += "</select>" 
    end

    def recurse_tree(page, depth, name, current_selection, exclusion)
      depth = depth + 1
      level = "- " * depth
      ret = ''
      if page.children.size > 0
        page.children.each { |subpage| 
          if subpage.id != exclusion
          if subpage.children.size > 0
              ret += '<option value="'+subpage.id.to_s+'"'
              ret += "selected=\"selected\"" if current_selection == subpage.id
              ret += ">"
              ret += h(level + subpage[name])
              ret += recurse_tree(subpage, depth, name, current_selection, exclusion)
              ret += '</option>'
          else
            ret += '<option value="'+subpage.id.to_s+'">'
            ret += h(level + subpage[name])
            ret += '</option>'
           end
         end
         }
         ret += ''
      end
    end  
end

## view

		<%= render_tree_select(Page.find(:all, :conditions => ["parent_id = ? and id != ?", 0, @page.id], :order => :position), :title, 'page_parent_id', 'page[parent_id]', @page.parent_id, @page.id, 'Main page (no parent)') %>