Link to the last page of the thread if possible

svcover.user.js

// ==UserScript==
// @name          SV Cover last thread
// @namespace     http://ikhoefgeen.nl/userscripts
// @description	  Programmeurs kunnen geen interfaces maken.
// @include       http://www.svcover.nl/*
// ==/UserScript==

function setLastPage(thread_id, page)
{
	localStorage['thread-' + thread_id] = page;
}

function getLastPage(thread_id)
{
	return parseInt(localStorage['thread-' + thread_id]) || 0;
}

function isLinkToThreadStart(url)
{
	return /\/forum\.php\?thread=\d+$/.test(url);
}

function isLinkToThreadPage(url)
{
	return /\/forum\.php\?thread=\d+&page=\d+$/.test(url);
}

function getThreadId(url)
{
	return url.match(/[\?&]thread=(\d+)/)[1];
}

function getPageNum(url)
{
	return parseInt(url.match(/[\?&]page=(\d+)/)[1]);
}

function foreach(traversable, callback)
{
	Array.prototype.forEach.call(traversable, callback);
}

function main()
{
	foreach(document.getElementsByTagName('a'), function(link)
	{
		if (isLinkToThreadStart(link.href))
		{
			var last_page = getLastPage(getThreadId(link.href));
			
			if (last_page)
				link.href += '&page=' + last_page;
		}
	});

	if (isLinkToThreadPage(document.location.href))
	{
		var thread_id = getThreadId(document.location.href),
			page_num = getPageNum(document.location.href);
		
		if (getLastPage(thread_id) < page_num)
			setLastPage(thread_id, page_num);
	}
}

main();