function show(id) {
	el = document.getElementById(id);
	el.style.visibility = 'visible';
}
function hide(id) {
	el = document.getElementById(id);
	el.style.visibility = 'hidden';
}
function process(id, flag) {
	if (flag) {
		show(id);
	} else {
		hide(id);
	}
}