function display(it) {
	var it = document.getElementById(it);
	it.style.display = (it.style.display=='block')?'none':'block';
}
function hide(it1) { 
	var it1 = document.getElementById(it1);
	it1.style.display = 'none';
}
function show(it2) { 
	var it2 = document.getElementById(it2);
	it2.style.display = 'block';
}
function none(){}