Add < Prev and Next > Navigation for RAFO threads.

th.rafo.user.js

// ==UserScript==
// @name        Thread.And.Find.Out
// @namespace   mavc
// @description Add < Prev and Next > Navigation for RAFO threads.
// @match       http://*.readandfindout.com/*
// @version     1.0.0
// ==/UserScript==

function getNext(t) {
    // get first child, next sibling, or getNext() of parent.
    var n;
    if (!t.classList.contains("thread")) {
        return null;
    }    
    else if (n = t.querySelector("div.thread")) {
        return n;
    }
    else if (n = t.nextElementSibling) {
        return n;
    }
    else {
        return getNext(t.parentNode);
    }
}

function rightMost(t) {
    var n;
    if ((n = t.lastElementChild) && n.classList.contains("thread")) {
        return rightMost(n);
    }
    return t;
}

function getPrev(t) {
    // get rightmost of previous sibling, or parent.
    var n;
    if ((n = t.previousElementSibling) && n.classList.contains("thread")) {
        return rightMost(n);
    }
    else {
        return (n = t.parentNode).classList.contains("thread") ? n : null;
    }
}

(function() {
    var t = document.querySelector("div.thread.current");
    if (!t) return;

    var next = getNext(t),
        prev = getPrev(t);
    
    var footer = document.getElementById("post_footer");
    
    if (prev) {
        var prevLink = prev.querySelector("a").cloneNode();  
        prevLink.className = "last";
        prevLink.innerHTML = "&lt; Previous post";
        footer.insertBefore(prevLink, footer.querySelector("img"));
    }
    
    if (next) {       
        var nextLink = next.querySelector("a").cloneNode();
        nextLink.className = "last";
        nextLink.innerHTML = "Next post &gt;"
        footer.appendChild(nextLink);
    }
    
}());