//this listener looks through all links in page and opens them in a new window
function externalLinks() {
	if (!document.getElementsByTagName) return;
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i<anchors.length; i++) {
		var anchor = anchors[i];
		//checks for the rel="external" attribute
		if (anchor.getAttribute("href") &&
			anchor.getAttribute("rel") === "external")
			anchor.target = "_blank";
	}
}
window.onload = externalLinks;