var current_qa = 0;

function showAnswer(qaId) {
	var qa = document.getElementById("answer" + qaId);
	if (qa) qa.style.display = "block";
}

function hideAnswer(qaId) {
	var qa = document.getElementById("answer" + qaId);
	if (qa) qa.style.display = "none";
}

function toggleAnswer(qaId) {
	if (current_qa) hideAnswer(current_qa);
	if (current_qa != qaId) showAnswer(qaId);
	current_qa = (current_qa != qaId?qaId:0);
}