xd.js

(function() {
    'use strict';

    var cacheBust = 0,
        hashInterval,
        lastHash;

    this.xd = {
        postMessage: function(message, targetOrigin, otherWindow) {
            if (!targetOrigin)
                return;

            otherWindow = otherWindow || window.parent;
            otherWindow.postMessage(message, targetOrigin.replace(/([^:]+:\/\/[^\/]+).*/, '$1'));
        },
        onMessage: function(callback, origin) {
            if (window.addEventListener) {
                window[callback ? 'addEventListener' : 'removeEventListener']('message', callback);
            } else {
                window[callback ? 'attachEvent' : 'detachEvent']('onmessage', callback);
            }
         }
    };
}).call(this);