RES - Auto-hide image expando upon closing

// ==UserScript==
// @name          Reddit - Auto-hide image expando upon closing [RES]
// @namespace     http://userscripts.org/scripts/show/108827
// @author        gavin19
// @description   [RES] only. Collapsing an image expando hides the entire post.
// @match         http://reddit.com/*
// @match         https://reddit.com/*
// @match         http://*.reddit.com/*
// @match         https://*.reddit.com/*
// @include        http://reddit.com/*
// @include         https://reddit.com/*
// @include        http://*.reddit.com/*
// @include         https://*.reddit.com/*
// @version       1.03
// ==/UserScript==
var hideCollapsed = {
    init: function() {
        var expando = document.querySelectorAll('a.expando-button');
        document.body.addEventListener('DOMNodeInserted', function(event) {
            if ((event.target.tagName == 'DIV') && (event.target.getAttribute('id') && event.target.getAttribute('id').indexOf('siteTable') != -1)) {
                expando = event.target.querySelectorAll('a.expando-button');
                hideCollapsed.addListeners(expando);
            }
        });
        hideCollapsed.addListeners(expando);
    },
    addListeners: function(expando) {
        var ele, clickEvent = document.createEvent("MouseEvents");

        function addListener() {
            ele = this;
            ele.removeEventListener('click', addListener, false);
            if (ele.parentNode.parentNode.querySelector('.expanded')) {
                ele.parentNode.parentNode.querySelector('.expanded').addEventListener('click', function() {
                    clickEvent.initEvent("click", false, true);
                    ele.parentNode.parentNode.querySelector('.hide-button a').dispatchEvent(clickEvent);
                });
            }
        }
        for (var i = 0, len = expando.length; i < len; i += 1) {
            expando[i].addEventListener('click', addListener, false);
        }
    }
}
if (document.body) {
    setTimeout(function() {
        hideCollapsed.init();
    }, 3000);
}
else {
    window.addEventListener("load", function() {
        hideCollapsed.init();
    }, false);
}