function EmptyName() {
	if (document.getElementById('LoginUser').value == "username") {
		document.getElementById('LoginUser').value = "";
		document.getElementById('LoginPass').value = "";
	}
}

function swap(id) {
	document.getElementById("trainingen").style.visibility = "hidden";
	if (id != "") {
		var box = document.getElementById(id);
		box.style.visibility = "visible";
	}
}