function externalLinks()
{
	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;