function mathAnswerView(){
	document.getElementById('les_box_a1').style.display   = 'block';
	document.getElementById('mathAns').style.display      = 'block';
	document.getElementById('mathQues').style.display     = 'none';
	document.getElementById('math_les_txt').style.display = 'block';
	return false;
}

function mathAnswerNone(){
	document.getElementById('les_box_a1').style.display   = 'none';
	document.getElementById('mathQues').style.display     = 'block';
	document.getElementById('mathAns').style.display      = 'none';
	document.getElementById('math_les_txt').style.display = 'none';
}

function engAnswerView(){
	document.getElementById('les_box_a2').style.display  = 'block';
	document.getElementById('engAns').style.display      = 'block';
	document.getElementById('engQues').style.display     = 'none';
	document.getElementById('eng_les_txt').style.display = 'block';
}

function engAnswerNone(){
	document.getElementById('les_box_a2').style.display  = 'none';
	document.getElementById('engQues').style.display     = 'block';
	document.getElementById('engAns').style.display      = 'none';
	document.getElementById('eng_les_txt').style.display = 'none';
}