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 = externalLinks;