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node / whatcd gazelle navigation buttons on requests page

// ==UserScript==
// @name        whatcd gazelle navigation buttons on requests page
// @include     /https?://www\.empornium\.(me|sx)/requests\.php\?action=view&id=.*/
// @version     1
// @require     http://code.jquery.com/jquery-2.1.1.js
// @grant       none
// ==/UserScript==

"use strict";

this.$ = this.jQuery = jQuery.noConflict(true);

function AddNavigationButtons() {
    var self = this;

    this.request_id = null;

    this.create_arrow = function (request_id, title, img_src) {
        var $arrow = jQuery('<span><a><img></img></a></span>');
        jQuery('a', $arrow).prop({
            'title': title,
            'href': self.create_request_url(request_id)
        });
        jQuery('img', $arrow).prop('src', img_src);
        return $arrow;
    };

    this.create_prev_arrow = function (request_id) {
        var $arrow = self.create_arrow(
            request_id,
            'goto previous torrent',
            'static/styles/modern/images/arrow_left.png'
        );
        $arrow.css('float', 'left');
        return $arrow;
    };

    this.create_next_arrow = function (request_id) {
        var $arrow = self.create_arrow(
            request_id,
            'goto next torrent',
            'static/styles/modern/images/arrow_right.png'
        );
        $arrow.css('float', 'right');
        return $arrow;
    };

    this.get_current_request_id = function () {
        return parseInt(window.location.href.match(/id=(\d+)/)[1]);
    };

    this.create_request_url = function (request_id) {
        return window.location.href.replace(/id=(\d+)/, 'id=' + request_id);
    };

    this.add_navigation_buttons = function () {
        var $h2 = jQuery('#content h2');
        $h2.prepend(self.create_prev_arrow(self.request_id - 1));
        $h2.append(self.create_next_arrow(self.request_id + 1));
    }

    this.init = function () {
        self.request_id = self.get_current_request_id();
        self.add_navigation_buttons();
    };

    this.init();
}

jQuery(document).ready(function() {
    new AddNavigationButtons();
});