function externalLinks()
{
	if (document.getElementsByTagName)
	{
		var anchors = document.getElementsByTagName("a");
		for (var i = 0; i < anchors.length; i = i + 1)
		{
			var a = anchors[i];
			if (a.getAttribute("href") && a.getAttribute("rel") === "external")
			{
				a.target = "_blank";
			}
		}
	}
}

window.onload = externalLinks;