function toggleAnswerKey()
{
	var e=document.getElementsByTagName("span");
	for(var i=0;i<e.length;i++)
	{
		if (e[i].className == "hiddenAnswer") e[i].className = "shownAnswer";
		else if (e[i].className == "shownAnswer") e[i].className = "hiddenAnswer";
	}
	
	var e=document.getElementsByTagName("td");
	for(var i=0;i<e.length;i++)
	{
		if (e[i].className == "lineBelowHidden") e[i].className = "lineBelowShown";
		else if (e[i].className == "lineBelowShown") e[i].className = "lineBelowHidden";
	}
}