A simple Greasemonkey script for a dual pane Hacker News interface

HNdualpane.js

// ==UserScript==
// @name           HN Dual Pane
// @namespace      com.chetansastry
// @description    An experimental dual pane version of Hacker News
// @include        http://news.ycombinator.com/*
// ==/UserScript==
var win = unsafeWindow,
    isCommentPage = !!win.location.href.match(/item\?/);

//Add splitpane
document.querySelector('body>center').style.width = '50%';
document.querySelector('body>center>table').width = '90%';
var frame = document.createElement("iframe");
frame.name = 'gm_target';
frame.style.position = 'fixed';
frame.style.width='50%';
frame.style.right=0;
frame.style.top=0;
frame.style.height='100%';
frame.style.borderStyle='none';
document.body.appendChild(frame);
	
if (!isCommentPage) {
	//go through each link to articles and update the href target
	var links = document.querySelectorAll('td.title>a');
	for (var i=links.length-1; i>=0 ; i--) {
		links[i].setAttribute('target', 'gm_target');
	}
}
else {
	//already on comment page. Load the relevant article in the frame
	var articleLink = document.querySelector('td.title>a');
	frame.src = articleLink.href;
}