<%= f.fields_for field_name, new_add_banner_file do |f| %>
	<p class="new_file">		
	  <%= f.file_field :file %>
		<%= render :partial => "ad_image_form", :locals => { :f => f } %>
		<%= button_tag '+', :class => "multi_files"%>
	</p>
<% end %>