function extlink(){
	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 = "_blank";
	}
}