/*
 * menuExpandable.js - implements an expandable menu based on a HTML list
 * Author: Dave Lindquist (http://www.gazingus.org)
 */

if (!document.getElementById)

/*//preload images test
plusimage = new Image();
plusimage.src = "url(/current_site/images/plus.gif";
squareimage = new Image();
squareimage.src = "url(/current_site/images/square.gif";
minusimage = new Image();
minusimage.src = "url(/current_site/images/minus.gif";
// end preload */
    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.listStyleImage = "url(/current_site/images/plus.gif)";
    actuator.onclick = function() {
        var display = menu.style.display;
        this.parentNode.style.listStyleImage =
            (display == "block") ? "url(/current_site/images/plus.gif)" : "url(/current_site/images/minus.gif)";
        menu.style.listStyleImage = "url(/current_site/images/square.gif)";
        menu.style.display = (display == "block") ? "none" : "block";

        return false;
    }
}

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

        return false;
    }
}