//This function makes external links open a new window if the rel attribute is set to "external".
//Use this attribute instead of target="_blank" that is not allowed in combination 
//with the href attribute in the latest (X)HTML standards
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;