/*
 * menuExpandable2.js - implements an expandable menu based on a HTML list
 * Author: Dave Lindquist (dave@gazingus.org)
 */

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

var menuCookie = "menusToExpand";

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.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";
        var menusToExpand = getCookie(menuCookie);
        if (menu.style.display == "block") {
            // set a cookie to keep the menu expanded
            if (menusToExpand == null) {
                setCookie(menuCookie,menuId);
            } else if (menusToExpand.indexOf(menuId) == -1) {
                setCookie(menuCookie,menusToExpand+","+menuId);
            }
        } else {
            // remove it from the expanded cookie list
            if (menusToExpand.indexOf(menuId) != -1) {
                // check for comma after menu
                if (menusToExpand.indexOf(menuId+",") != -1) {
                    menusToExpand = menusToExpand.replace(menuId+",","");
                } else {
                    menusToExpand = menusToExpand.replace(menuId,"");
                }
                if (menusToExpand == "") {
                    deleteCookie(menuCookie);
                } else {
                    setCookie(menuCookie,menusToExpand);
                }
            }
        }

        return false;
    }
}

function openMenu(menuId) {
    var menu = document.getElementById(menuId);
    var actuatorId = menuId.substring(0, menuId.indexOf("Menu")) + "Actuator";
    var actuator = document.getElementById(actuatorId);
    if (menu != null) {
        var display = menu.style.display;
        menu.parentNode.style.backgroundImage = "url(images/minus.gif)";
        menu.style.display = (display == "block") ? "none" : "block";
    }
}

function expandMenus() {
    var menusToExpand = getCookie(menuCookie);
    if (menusToExpand != null) {
        // if more than one menu has been menusToExpanded,
        // create an array of menusToExpanded menus
        if (menusToExpand.indexOf(",") != -1) {
            menuArray = menusToExpand.split(",");
            for (var i=0; i < menuArray.length; i++) {
                openMenu(menuArray[i]);
            }
         } else {
            openMenu(menusToExpand);
         }
    }
}