// http://seofromusa.com/wordpress-customizazion/target-blank-rel-external-nofollow/

function externalLinks() {
	if (!document.getElementsByTagName) return;
	var anchors1 = document.getElementsByTagName("a");
	var anchors2 = document.getElementsByTagName("area");
	var anchors3 = document.getElementsByTagName("form");
	for (var i=0; i<anchors1.length; i++) {
		var anchor1 = anchors1[i];
		if (anchor1.getAttribute("href") &&
		((anchor1.getAttribute("rel") == "external nofollow") || (anchor1.getAttribute("rel") == "nofollow external") || (anchor1.getAttribute("rel") == "external")))
		anchor1.target = "_blank";
	}
	for (var i=0; i<anchors2.length; i++) {
		var anchor2 = anchors2[i];
		if (anchor2.getAttribute("href") &&
		((anchor2.getAttribute("class") == "external")))
		anchor2.target = "_blank";
	}
	for (var i=0; i<anchors3.length; i++) {
		var anchor3 = anchors3[i];
		if (anchor3.getAttribute("action") &&
		((anchor3.getAttribute("class") == "external")))
		anchor3.target = "_blank";
	}
}

window.onload = externalLinks;