var activemenu = null;

function setupmenu(id) {
	setLeft(id+'submenu',getLeft(id+'menu'));
	setTop(id+'submenu',getTop(id+'menu'));
}

function showmenu(id) {
	if ( (activemenu != null) && (activemenu.id != id) ) closemenu(activemenu.id );
	activemenu = document.getElementById(id);
	activemenu.style.visibility = 'visible';
}

function closemenu(id) {
	activemenu.style.visibility = 'hidden';
}
	
function closeactivemenu() {
	if (activemenu != null) closemenu(activemenu.id);
}