Rails - Jan 2010 - 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 %>

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