Google tracking for static files

tracking.js

/*
* Google tracking for static files
*/
/*jslint browser: true, vars: true, white: true, forin: true, nomen: true */
/*global window, jQuery, _gaq */

(function ($) {
    "use strict";

    var init_tracking = function () {
        var $body = $('body');
        $body.delegate("a", "click", function (e) {
            e = e || window.event;
            var t = e.target || e.srcElement,
					ext,
					fileName,
					filetypes = /(zip|ZIP|pdf|PDF|csv|CSV|doc*|DOC*|xls*|XLS*|ashx)+$/;
            try {
                if (t.nodeName === "A") {
                    fileName = /([^\/])+$/.exec(t.href)[0];
                    ext = /[^\.]+$/.exec(fileName.split('&')[0])[0];
                    if (filetypes.test(ext)) {
                        var eventName = 'Downloaded - ' + ext + ' Document';
                        trackEvent('Download', eventName, fileName, '');
                        setTimeout(function () {
                            window.location.href = t.href;
                        }, 100);
                        return false;
                    }
                }
            } catch (ex) {
                debug.error('Error trying to track download', ex);
            }
        });
    };

    var init_youtube_tracking = function () {
        try {
            var ytTracker = new YoutubeTracker(/*opt_bucket*/false, function (category, action, label, value) {
                trackEvent(category, action, label, value);
            }, /*debug*/false);
        } catch (e) { }
    };

    var trackEvent = function(eventName, action, label, value) {
        if (typeof _gaq !== 'undefined') {
            _gaq = _gaq || [];
            debug.log('Tracking', eventName, action, label, value);
            _gaq.push(['_trackEvent', '\'' + eventName + '\'', '\'' + action + '\'', '\'' + label + '\'', 0]);
        }
    };

    $(document).ready(function () { init_tracking(); init_youtube_tracking(); });
} (jQuery));