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 nofollow") 
		      || (anchor.getAttribute("rel") == "nofollow external")
		      || (anchor.getAttribute("rel") == "external")
		   )
		)
		{
			anchor.target = "_blank";
		}
	}
}

window.onload = externalLinks;