function showSub(which) {
		el = "subL" + which;
		act = "plus" + which;
		menu = document.getElementById(el);
		actuator = document.getElementById(act);
		display = menu.style.display;
		menu.style.display = (display == 'none')? 'block':'none'
		document.images[act].src = (display == 'none')? 'images/listMinus.gif':'images/listPlus.gif';
	}