function modifyExternalLinks(doc) {
	var anchors = doc.getElementsByTagName("a");
	for (var i=0; i<anchors.length; i++) {
		var anchor = anchors[i];
		var loc = anchor.getAttribute("href");
		if (isExternalLink(loc)) {
			// Make the link open in a new window
			anchor.target = "_blank";
			//alert("Modifying anchor (external site): " + loc);
		}
	}
}

function isExternalLink(loc) {
	var prefix = "http://";
	var local = "http://wiki.kanaleninbalans.nl/wiki";
	return (loc && loc.indexOf(prefix) == 0 && loc.indexOf(local) != 0);
}