function showCard(num) {
	document.getElementById("b0").style.display = "none";
	document.getElementById("b" + num ).style.display = "block";
}

function hideCard(num) {
	document.getElementById("b" + num ).style.display = "none";
	document.getElementById("b0").style.display = "block";
}

function showPic(num) {
	document.getElementById("b" + npic).style.display = "none";
	document.getElementById("b" + num ).style.display = "block";
	npic = num;
};