function showgame() {
	document.getElementById("showrules").style.display="none";
	document.getElementById("showgame").style.display="block";
	try {
		document.getElementById("showscores").style.display="none";
	} catch(e) { }
}
function showrules() {
	document.getElementById("showgame").style.display="none";
	document.getElementById("showrules").style.display="block";
	try {
		document.getElementById("showscores").style.display="none";
	} catch(e) { }
}
function showscores() {
	document.getElementById("showgame").style.display="none";
	document.getElementById("showrules").style.display="none";
	document.getElementById("showscores").style.display="block";
}