(function($) {  
    $.twitterGraph = function(twitterName, element) {  
        var usageData = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];  
        $.getJSON(  
                'http://search.twitter.com/search.json?callback=?&rpp=50&q=from:' + twitterName,  
                function(data) {  
                    $.each(data, function(i, tweets) {  
                        if (tweets.length != undefined)  
                            if (tweets[0].created_at != undefined)  
                            for (i = 0; i < tweets.length; i++) {  
                                var usageHour = (new Date(tweets[i].created_at)).getHours();  
                                usageData[usageHour] += 2;  
                        };  
                    })  
  
                    element.sparkline(usageData,  
                        {  
                            type: 'bar',  
                            barColor: '#4D4D4D',  
                            height: 25  
                        });  
  
                    $('<span>' + twitterName + ': tweets per hour</span>').insertAfter(element.find("canvas"));  
                }  
            );  
    };  
})(jQuery);