function togglebox(num) {
	for (var i=0; i<4; i++) {
		var el = document.getElementById("tab"+i);
		if (i==num) el.className="open";
		else el.className="";

		var el2 = document.getElementById("box"+i);
		if (i==num) el2.style.display="block";
		else el2.style.display="none";
	}
}