function targetBlank() {
	if (!document.getElementsByTagName) return true;
	var anchorArr = document.getElementsByTagName("a");
	
	for (var i=0;i<anchorArr.length;i++) {
		var a=anchorArr[i];
		if (a.getAttribute("href") && a.getAttribute("rel")=="external") a.target="_blank";
	}
	
}
window.onload=targetBlank;