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

window.onload = LinkRels;