= form_for Comment.new, :remote => true do |f|
  %p
    %label{:for => "comment_text_on_#{post.id}"} Comment
    = f.text_area :text, :rows => 2, :id => "comment_text_on_#{post.id}"
  = f.hidden_field :post_id, :value => post.id
  %p
    = f.submit "Comment"