function externalLinks() {
     if (!document.getElementsByTagName) return;
	var anchors = document.getElementsByTagName('a');
	for (var i=0; i<anchors.length; i++) {
		anchor = anchors[i];			
		var rel = anchor.rel;			
		if (anchor.getAttribute('href') && rel.substring(0,8) == 'external' )
			anchor.target = '_blank';			
	 	}			
	}
window.onload = externalLinks;