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") == "externallink")
		anchor.target = "_blank";
	}
}
window.onload = externalLinks;