Thread Navigating by Arrow keys

Use ← or → and Ctrl to navigate to previous, next, first or last page
As of 10/04/2015. See the latest version.
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// ==UserScript==
// @name        Thread Navigating by Arrow keys
// @namespace   https://greasyfork.dpdns.org/scripts/6849-thread-navigating-by-arrow-keys
// @description Use ← or → and Ctrl to navigate to previous, next, first or last page
// @author      theheroofvn
// @include     /^.*(thread|forum|diendan).*$/
// @include     http://www.vn-zoom.com/*
// @require     http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js
// @grant       none
// @version     5.7
// ==/UserScript==
if (frameElement) return;
this.$ = this.jQuery = jQuery.noConflict(true);
var prev, next, first, last, up, up_sub = '[itemtype="http://data-vocabulary.org/Breadcrumb"] a';
var site_info = [
    {
		host: "www.webtretho.com",
		prev: "a.arrowPrePage",
		next: "a.arrowNextPage",
		first: "a.arrowFstPage",
		last: "a.arrowLstPage"
    },
    {
        host: "forum.bkav.com.vn",
        prev: "a.js-pagenav-prev-button[href]:not([href=''])",
        next: "a.js-pagenav-next-button[href]:not([href=''])",
        first: "a[data-page='1']",
        last: "a.js-pagenav-button[href]:not([href='']):nth-last-child(2)",
        up: "#breadcrumbs a.crumb-link"
    }
];
function custom_site(list) {
    if (list.length === 0) return 0;
    for (var i = 0; i < list.length; i++) {
        if (location.hostname == list[i].host) {
			prev  = list[i].prev;
			next  = list[i].next;
			first = list[i].first;
			last  = list[i].last;
			up    = list[i].up;
            return 1;
        }
    }
    return 0;
}
function checkScriptExist(script) {
    return $('script[src*="' + script + '"]').length > 0 ? true : false;
}
function detect_forum() {
    var result = "";
    if (checkScriptExist("vbulletin")) result = "vbb"; else if (checkScriptExist("xenforo")) result = "xenforo"; else if (checkScriptExist("general.js")) result = "mybb"; else if (checkScriptExist("forum_fn.js")) result = "phpbb";
    return result;
}
var detect = detect_forum();
if (custom_site(site_info) === 0) {
    if (detect == "vbb") {
		prev  = 'a[rel="prev"]';
		next  = 'a[rel="next"]';
		first = 'a[rel="start"]';
		last  = 'a[title^="Last"], a[title*="uối"]';
		up    = "span.navbar a, li.navbit a";
    } else if (detect == "xenforo") {
		prev  = ".PageNav a.text:first-child";
		next  = ".PageNav a.text:last-child";
		last  = ".PageNav nav > a:nth-last-child(2)";
		first = 'a[rel="start"]';
		up    = "a.crumb";
    } else if (detect == "mybb") {
		prev  = "a.pagination_previous";
		next  = "a.pagination_next";
		first = "a.pagination_first";
		last  = "a.pagination_last";
		up    = ".navigation > a";
    } else if (detect == "phpbb") {
		prev  = ".display-options a.left-box.left";
		next  = ".display-options a.right-box.right";
		first = ".pagination > span > a:first-child";
		last  = ".pagination > span > a:last-child";
		up    = ".navlinks > .icon-home a";
    } else return;
}
var multi = {17:!1,8:!1,37:!1,39:!1}, multi1 = {17:!1,8:!1}, multi2 = {17:!1,37:!1}, multi3 = {17:!1,39:!1};
var nav = {
    prev: $(prev)[0],
    next: $(next)[0],
    first: $(first)[0],
    last: $(last)[0],
    up: function() {
        return $(up).length > 0 ? $(up).last()[0] : $(up_sub).last()[0];
    }
};
$(window).keydown(function(e) {
    var key = e.keyCode, action = null, link = null;
    if (key in multi) multi[key] = true; else return;
    if (key in multi1) {
        if (multi[17] && multi[8]) action = "up";
    } else if (key in multi2) {
        if (!multi[17] && multi[37]) action = "prev"; else if (multi[17] && multi[37]) action = "first";
    } else if (key in multi3) {
        if (!multi[17] && multi[39]) action = "next"; else if (multi[17] && multi[39]) action = "last";
    }
    if (!action || typeof nav[action] === "undefined" || e.target.tagName == "INPUT" || e.target.tagName == "TEXTAREA") return;
    if (typeof nav[action] === "function") link = nav[action](); else link = nav[action];
    window.location = link;
}).keyup(function(e) {
    if (e.keyCode in multi) multi[e.keyCode] = false;
});
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