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 = "_blank"; 

	} 
	
} 

window.onload = externalLinks;