function init() {
	// Fetch all the a elements in the document.
	var links = document.getElementsByTagName('a');

	// Loop through the a elements in reverse order
	// for speed.
	for (var i = links.length; i != 0; i--) {
		
		// Pull out the element for this iteration.
		var a = links[i-1];
		
		// If the element doesn't have an href, skip it.
		if (!a.href) continue;

		// If the element has a className that contains
		// 'external' attach the onclick handler.
		if (a.className && a.className.indexOf('external') != -1) a.onclick = popWin;
	}
}

function popWin(e) {
	// Accommodate IE's non-standard event handling.
	if (!e) var e = window.event;
	var a = e.target ? e.target : e.srcElement;

	// Open a new window with the link's href.
	var newwin = window.open(a.href);

	// The thought is that if the new window didn't
	// (popups blocked or whatever) we want to return
	// true so the link is follow normally. Not sure
	// if this works, but it doesn't seem to hinder.
	return !newwin;                               
}

onload = init;