function initExternalLinks() {
	if (document.getElementsByTagName) {
		var anchors = document.getElementsByTagName("a");
		for (var i=0; i<anchors.length; i++) {
			var anchor = anchors[i];
			if (anchor.getAttribute("href") &&
			anchor.getAttribute("rel") == "external")
			anchor.target = "_blank";
		}
	}
}
document.observe( 'dom:loaded', initExternalLinks );