Rails - Nov 2009 - Success in Observe field

Hi,
How to call javascript function using success in observe field .

      <%= observe_field (ha.id,
          :frequency => 0.5,
          :update => "article_list_#{ha.id}",
          :url => {:action => :auto_complete_for_article_title, :id =>
ha.id},
          :with => "''article=''+ escape(value)",
          :success => "close_title(#{ha.id})")%>

<div id="article_list_<%= ha.id %>"></div>

In javascript :
  function close_title(div_id){
   
document.getElementById(''article_list_''+div_id).style.display="block";
  }

I want to call close_title function for every success ie. status 200 OK
.
let me know if any there are any alternatives if wrong

thanks,
sri..
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