short:
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(How can I count the number of elements in the XML, and like an array get the element with index (i)?)

long:
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Hi eveyone,
I'm a newbie and I think my problem is straight forward, however I wasn't able to find anything in the API or by googling.
I have a XML file and it updates every 1/10 second, ( an elements is added to the end of the root).
I want my code to        
        periodically check the XML the file every 0.5 second,
                and add  the last element if it's new.

Thus I cant use the basic traverse method explained everywhere:
[code]
   $(xml).find('value').each(function(){    
        //var id = $(this).attr('id');
        var id = $(this).find('id').text();
        var text = $(this).find('text').text();    
        var html = '<div class="single_data" id="link_'+id+'"> <i>'+id+'</i> <b id="value">'+text+'</b> </div>';
 
        $('#wrapper').append($(html));         
    });
[/code]

How can I maybe count the number of elements in the XML, and like an array get the element with index (i)?

thank you,
-Armen