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<script src="javascripts/prototype.js" type="text/javascript"></script>
<script src="javascripts/scriptaculous.js" type="text/javascript"></script>
script type="text/javascript" language="javascript">
  // <![CDATA[
  $('element_id').appear();
  // ]]>
</script>
<div onclick="$(this).switchOff()">
  Click here if you've seen enough.
</div>
<div onclick="$(this).blindUp({ duration: 16 })">
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</div>