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";
		}
	}
} 

addLoadEvent(externalLinks);