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;