loadGraphiteValues

if (typeof getGraphiteValue=="undefined") {
    var getGraphiteValue, reloadGraphiteValues;
    getGraphiteValue = function(target, jsonUrl) {
        var $target;
        if (target instanceof $) {
            $target = target;
        } else {
            $target = $(target);
        }
        $.ajax({
            url: jsonUrl,
            success: function(response) {
                if (response && response instanceof Array && response.length>0 && response[0].hasOwnProperty('datapoints') && response[0].datapoints instanceof Array && response[0].datapoints.length>0) {
                   $target.html(response[0].datapoints[0][0]);
                } else {
                   $target.html("Unexpected data");   
                }
            },
            error: function(response) {
                   $target.html("Error");
            }   
        });    
    }
    reloadGraphiteValues = function() {
        $("[data-get-graphite-value*=http]").each(function(){
            getGraphiteValue($(this), $(this).attr("data-get-graphite-value"));
        });
    }
    setInterval(function(){
        reloadGraphiteValues();        
    }, 30000);
    reloadGraphiteValues();
}

// Example usage
/*
    <div data-get-graphite-value='http://graphite.lab.vpn.minijuegos.com/render/?width=921&height=459&_salt=1372068496.48&target=alias(hitcount(stats.miniplay.minisite.pageviews.web.category.total%2C%2224h%22)%2C%22category%22)&from=-24h&yMin=0&title=PAGEVIEWS_PER_TYPE&format=json'></div>
*/