function changeBox(num, clicked) {
	for (i = 0; i < num; i++) {
		if (i == clicked) {
			document.getElementById('box'+i).style.display = 'block';
		} else {
			document.getElementById('box'+i).style.display = 'none';
		}
	}
}

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;