Rails - Sep 2009 - prototype link_to_function

hi everybody! i`m trying to apply this function(prototype):
<%= link_to_function "reply",
"$(''main-comment-form'')
 .hide()
 .appendTo(''comment-#{comment.id} .form-placeholder'')
//problem is here
probably
 .fadeToggle(600);
 $(''comment_parent_id'').setValue(#{comment.id});"%>

after clicking the link form hides succesfully, but it doesn`t append to
.form-placeholder

<div id="comment-6">
  <span id="commenter">July</span><span
id="comment-date">
    (September 23, 2009 at 11:15 PM)</span><br>

  stupid ukrainians!!
  <div class="form-placeholder"></div>
</div>

how do we specify id and class to append the form using prototype?
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