jquery live example

gistfile1.html

# /app/views/contacts/index.html.erb
<div class="contacts">
  <div class="contact" id="contact_1">
    <p class='name'>Cool Dude 1</p>
    <div class="details">...</div>
  </div>
  <div class="contact" id="contact_2">
    <p class='name'>Cool Dude 2</p>
    <div class="details">...</div>
  </div>
  ...
</div>

<script>
  $(function(){
    $(".contact").live('click', function(){
      $(this).find('.details').toggle();
    });
  });
</script>