$(document).ready(function(){
	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"; 
	} 

}