// JavaScript Document

	function changeDisplay(menuId, actuatorId) {
		var menu = document.getElementById(menuId);
		var actuator = document.getElementById(actuatorId);
		if (menu == null || actuator == null) return;
		if (window.opera) return;
		actuator.onclick = function() {
		var display = menu.style.display;
	    menu.style.display = (display == "block") ? "none" : "block";
		return false;
	    }
	}
		window.onload = function() {
		changeDisplay("catA", "catAActuator");
		changeDisplay("catB", "catBActuator");
		changeDisplay("catC", "catCActuator");
	}