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;