function show(obj) {
	if (document.getElementById(obj).style.display != 'block') document.getElementById(obj).style.display = 'block';
	else document.getElementById(obj).style.display = 'none';
}
function hide(obj) {
	if (document.getElementById(obj).style.display != 'none') document.getElementById(obj).style.display = 'none';
	else document.getElementById(obj).style.display = 'block';
}