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"; 
	}
}
function AddOnload(myfunc) {
	if(window.addEventListener)
		window.addEventListener('load', myfunc, false);
	else if(window.attachEvent)
		window.attachEvent('onload', myfunc);
}
AddOnload(externalLinks);