var openstate = new Array();
openstate['sub1'] = false;

function pop( id1 )
{
	if ( openstate[id1] )
	{
		popdown(id1);
	}
	else
	{
		popup(id1);
	}
	return;
}
function popup( id )
{
	submenu = document.getElementById( id );
	submenu.style.visibility = "visible";
	openstate[id] = true;
	return;
}
function popdown( id )
{
	submenu = document.getElementById( id );
	submenu.style.visibility = "hidden";
	openstate[id] = false;
	return;
}