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;