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('rel')) {
			var rel = anchor.getAttribute('rel');
			var external = false;
         
			if (rel.indexOf(' ') > 0) {
				while (rel.indexOf(" ") > 0 && external == false) {
					if (rel.substr(0, rel.indexOf(' ')) == 'external')
						external = true;

					rel = rel.substr(rel.indexOf(' ') + 1, rel.length - rel.indexOf(' ') + 1);
				}
			}
		
			if (rel == 'external')
				external = true;
		
			if (anchor.getAttribute('href') && external == true)
            	anchor.target = '_blank';
		}
	}
	
	return;
}

window.onload = externalLinks;