function externalLinks() {
	if (!document.getElementsByTagName) return;
	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 = "_top";
	}
}
if(window.addEventListener) {
	window.addEventListener("load", externalLinks, false);
}
else if(window.attachEvent) {
	window.attachEvent("onload", externalLinks);
}