var menu_current = '';

function clickMenu(id) {
	var elem;

	if (menu_current != '') {
		elem = document.getElementById('button'+menu_current);
		if (elem)
			elem.style.backgroundColor = '';
		elem = document.getElementById(menu_current);
		if (elem)
			elem.style.zIndex = 0;
		elem = document.getElementById('sub'+menu_current);
		if (elem)
			elem.style.visibility = 'hidden';
	}

	if (menu_current == id) {
		menu_current = '';
	} else {
		menu_current = id;
		elem = document.getElementById('button'+menu_current);
		if (elem)
			elem.style.backgroundColor = '#cb1800';
		elem = document.getElementById(menu_current);
		if (elem)
			elem.style.zIndex = 999;
		elem = document.getElementById('sub'+menu_current);
		if (elem)
			elem.style.visibility = 'visible';
	}
}