Raw Source
henrik.skogmo / Shush Next Episode 

// ==UserScript==
// @name         Shush Next Episode
// @namespace    http://skogmo.me/
// @version      1.0
// @description  Adds a link to the bottom of the player that points to the next episode
// @author       Henrik O. Skogmo
// @match        http://www.shush.se/index.php?id=*&show=*
// @grant        none
// @require http://code.jquery.com/jquery-latest.js
// ==/UserScript==

/* Get link for current show */
var showLink = window.location.href;
/* Get ID for current episode */
var regex = /id=(.*)&/g;
var match = regex.exec(showLink);
/* Increment show ID by 1 */
var newInt = parseInt(match[1])+1;
var nextShowLink = showLink.replace(/id=(.*)&/g, 'id='+newInt+'&');
$('.playernav').append('<b><a href="'+nextShowLink+'">NEXT EPISODE</a></b>');