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";
	}
	if (!document.getElementsByTagName) return;
	var divits = document.getElementsByTagName("div");
	for (var i=0; i<divits.length; i++) {
		var divi = divits[i];
		if (divi.className == "edu-block")
		divi.style.display = "none";
	}
}
window.onload = externalLinks;