if (!document.getElementById)
    document.getElementById = function() { return null; }

function initializeMenu(menuId, actuatorId) {
    var menu = document.getElementById(menuId);
    var actuator = document.getElementById(actuatorId);

    if (menu == null || actuator == null) return;

    //if (window.opera) return; // I'm too tired

    //actuator.parentNode.style.backgroundImage = "url(/images/plus.gif)";
    actuator.onclick = function() {
        var display = menu.style.display;
       // this.parentNode.style.backgroundImage =
            //(display == "block") ? "url(/images/plus.gif)" : "url(/images/minus.gif)";
        menu.style.display = (display == "block") ? "none" : "block";

        return false;
    }
}
 window.onload = function() {
            initializeMenu("menu1", "menu11");
            initializeMenu("menu2", "menu22");
            initializeMenu("menu3", "menu33");
            initializeMenu("menu4", "menu44");
        }