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"; 
	} 
}

if (window.addEventListener)
	window.addEventListener('load', ExternalLinks, false);
else window.attachEvent('onload', ExternalLinks);