function showAnswer(answerId) {
	if (document.getElementById("answer"+answerId).style.display=='block') {
		document.getElementById("answer"+answerId).style.display='none';
		document.getElementById("minus"+answerId).style.display='none';
		document.getElementById("plus"+answerId).style.display='inline';
	} else {
		document.getElementById("answer"+answerId).style.display='block'	
		document.getElementById("minus"+answerId).style.display='inline';
		document.getElementById("plus"+answerId).style.display='none';
	}
}