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";
			anchor.title = (anchor.title != "") ? anchor.title+" (opens in a new window)" : "opens in a new window";
			anchor.className = (anchor.className != '') ? anchor.className+' external' : 'external';

		}

	}

}

window.onload = externalLinks;