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;