function init() {
	externalLinks();
}

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 = init;