function showAnswer(arg) {
	if (arg == 1) {
	document.getElementById('a1').style.display = "block";
	document.getElementById('a2').style.display = "none";
	document.getElementById('a3').style.display = "none";
	document.getElementById('a4').style.display = "none";
	document.getElementById('a5').style.display = "none";
	}
	if (arg == 2) {
	document.getElementById('a1').style.display = "none";
	document.getElementById('a2').style.display = "block";
	document.getElementById('a3').style.display = "none";
	document.getElementById('a4').style.display = "none";
	document.getElementById('a5').style.display = "none";
	}
	if (arg == 3) {
	document.getElementById('a1').style.display = "none";
	document.getElementById('a2').style.display = "none";
	document.getElementById('a3').style.display = "block";
	document.getElementById('a4').style.display = "none";
	document.getElementById('a5').style.display = "none";
	}
	if (arg == 4) {
	document.getElementById('a1').style.display = "none";
	document.getElementById('a2').style.display = "none";
	document.getElementById('a3').style.display = "none";
	document.getElementById('a4').style.display = "block";
	document.getElementById('a5').style.display = "none";
	}
	if (arg == 5) {
	document.getElementById('a1').style.display = "none";
	document.getElementById('a2').style.display = "none";
	document.getElementById('a3').style.display = "none";
	document.getElementById('a4').style.display = "none";
	document.getElementById('a5').style.display = "block";
	}

}