[jQuery] autocomplete onSelectItem

[michelem]

Hi,
I'm trying the autocomplete plugin from: 
http://www.pengoworks.com/workshop/jquery/autocomplete.htm
I have a problem with the onSelectItem option that I suppose it will
be triggered when I select a value, right?
So i would like to do something when the value is selected, but It
doesn't work with my code:

<script type='text/javascript'>

  jQuery(document).ready(function($){
        $("#searchbox").autocomplete("db.php", {
                minChars:2,
                maxItemsToShow:25,
                cacheLength:10,
                onSelectItem:function(){
                        alert('Hello');
                },
                autoFill:true
        });
  });

</script>

<input type="text" name="myinput" id="searchbox" class="ac_input" >

Everything works fine but the onSelectItem option seems to do nothing,
any ideas?
thank you very much

Michele