cross-browser dom ready helper

domReady.js

(function (doc, w) {
    "use strict";

    var readyCallbacks = [],
        docLoadEv = "DOMContentLoaded",
        ready = (document.readyState === "complete");

    function registerForReadyEvent(fn) {

        if (ready) { //already ready, execute immediately
            fn(w);
        }
        else {
            readyCallbacks.push(fn);
        }
    }

    function waitForReadyEvent() {

        if (!ready) { //register using different ways for cross-browser support. the first one fired "wins"
            doc.addEventListener(docLoadEv, readyHandler);
            w.onload = readyHandler;
            doc.onload = readyHandler;
        }
    }

    function readyHandler() {

        if (!ready) {
            ready = true;

            doc.removeEventListener(docLoadEv, readyHandler);
            w.onload = null;
            doc.onload = null;

            fireReadyCallbacks();
        }
    }

    function fireReadyCallbacks() {

        readyCallbacks.forEech(function (fn) { //execute any callbacks waiting
            fn(w);
        });

        readyCallbacks.splice(0);
    }

    waitForReadyEvent();

    return registerForReadyEvent;
})(document, window);