<form action="/simple_search" method="post">
<fieldset id="simple_search" class="search_fieldset">
	<legend>Search & find</legend>
	<input type="text" name="search_query" id="search_query" class="search_input" /><img alt="Spinner-white" id="search-spinner" src="/images/spinner-white.gif" style="display:none;" />
  <div id="search_results">
  results:

  </div>
  </fieldset>
</form>

<script type="text/javascript">
//<![CDATA[
new Form.Element.Observer('search_query', 2, function(element, value) {new Ajax.Updater('search_results', '/simple_search', {asynchronous:true, evalScripts:true, onComplete:function(request){alert('done');Element.hide('search-spinner')}, onLoading:function(request){Element.show('search-spinner')}, parameters:'search_query=' + escape(value)})})
//]]>
</script>