Display total earning in every envato marketplace item page

envato-item-earning.user.js

// ==UserScript==
// @name         Display total earning in every envato marketplace item page
// @include      http://codecanyon.net/*
// @include      http://activeden.net/*
// @include      http://audiojungle.net/*
// @include      http://themeforest.net/*
// @include      http://videohive.net/*
// @include      http://graphicriver.net/*
// @include      http://3docean.net/*
// @include      http://marketplace.tutsplus.com/*
// @include      http://photodune.net/*
// ==/UserScript==

function hitung() {
    jQuery(document).ready(function(){
        var salesInIDR = jQuery('.price_in_dollars').html() * jQuery('.comments-purchases > p > span').html() * 0.5 * 9000;
        var from = jQuery('#item_attributes .attr-detail').first().html();

        function addCommas(nStr) {
            nStr += '';
            var x = nStr.split('.');
            var x1 = x[0];
            var x2 = x.length > 1 ? '.' + x[1] : '';
            var rgx = /(\d+)(\d{3})/;
            while (rgx.test(x1)) {
                x1 = x1.replace(rgx, '$1' + '.' + '$2');
            }
            return x1 + x2;
        }

        jQuery('.pricebox').before('<div class="content-box vertical-space" style="background: white; box-shadow: 0px 0px 15px #FA0; border: none;"> <div class="page-title" style="float:none;font-size: 24px;">Rp. '+addCommas(salesInIDR)+',-</div>since '+from+' </div>');

    });
}


// a function that loads jQuery and calls a callback function when jQuery has finished loading
// (c) http://stackoverflow.com/questions/2246901/include-jquery-inside-greasemonkey-script-under-google-chrome
function addJQuery(callback) {
  var script = document.createElement("script");
  script.setAttribute("src", "http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js");
  script.addEventListener('load', function() {
    var script = document.createElement("script");
    script.textContent = "(" + callback.toString() + ")();";
    document.body.appendChild(script);
  }, false);
  document.body.appendChild(script);
}

// load jQuery and execute the main function
addJQuery(hitung);