form_for helper?

How would make this a helper? I would like to send in some parameters as a hidden field dynamically.

<% form_for :file, :url => file_upload_path(:format => 'js'), :html => { :multipart => true, :target => 'upload_file', :id => 'fileupload' } do %>   <b>File:</b>&nbsp;   <%= file_field_tag :upload %>&nbsp;   <%= hidden_field_tag 'w_id', @work.id %>   <%= submit_tag 'Upload File' %>&nbsp; <% end %>