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;