JQuery+AJAX partial in form_for

Hi! I want to render partial which depends on form builder "f". How can I do it using AJAX+JQuery

Files #new.html.haml %h1   New order - form_for(@order) do |f|   = f.error_messages   %div#partial     = render "#{@order.current_step}_step", :f => f

#create.js.erb $("#partial").empty(); $("#partial").append     ( <%= render "#{@order.current_step}_step", :locals => {:f=>f}%>);

The error   undefined local variable or method `f' for ActionView::Base