function tutegroup_init () {
			for (i=1; i<=5; i++) {
				document.getElementById('group'+i).style.display="none";
			}
		}

		function togglevis (div) {
			if (document.getElementById(div).style.display=="block") {
				document.getElementById(div).style.display="none";
			} else {
				document.getElementById(div).style.display="block";
			}
		}
		function check_answer () {
			if (document.getElementById('answer_0').checked==true) {
				alert("Correct!");
			} else {
				alert("Sorry, that's not the right answer. Try again.");
			}
		}