$('#id_eleme').append('<div id="form_data"><%=form_tag(articles_path) do%>
                         <div id="' + article.name+ '" style="width:330px;">
                           ...some static text
                         </div>
                       <%end%></div>');

:javascript
   $('#id_eleme').append("<div id='form_data'>#{form_tag(articles_path) }
    <div id='#{article.name}' style='width:330px;'>
      ...some static text
    </div>
  </div>");