var activeButton = null;

function menuInit(menu) {
    var itemList, spanList;
    var textEl, arrowEl;
    var itemWidth;
    var w, dw;
    var i, j;

    // For IE, replace arrow characters.
    if (browser.isIE) {
        menu.style.lineHeight = "2.5ex";
        spanList = menu.getElementsByTagName("SPAN");
        for (i = 0; i < spanList.length; i++)
            if (hasClassName(spanList[i], "menuItemArrow")) {
                spanList[i].style.fontFamily = "Webdings";
                spanList[i].firstChild.nodeValue = "4";
            }
        }

    // Find the width of a menu item.
    itemList = menu.getElementsByTagName("A");
    if (itemList.length > 0)
        itemWidth = itemList[0].offsetWidth;
    else 
        return;

    // For items with arrows, add padding to item text to make the
    // arrows flush right.
    for (i = 0; i < itemList.length; i++) {
        spanList = itemList[i].getElementsByTagName("SPAN");
        textEl  = null;
        arrowEl = null;
        for (j = 0; j < spanList.length; j++) {
           if (hasClassName(spanList[j], "menuItemText"))
               textEl = spanList[j];
           if (hasClassName(spanList[j], "menuItemArrow"))
               arrowEl = spanList[j];
           }
        if (textEl != null && arrowEl != null)
            textEl.style.paddingRight = (itemWidth - (textEl.offsetWidth +
              arrowEl.offsetWidth)) + "px";
        }

    // Fix IE hover problem by setting an explicit width on first item of
    // the menu.
    if (browser.isIE) {
        w = itemList[0].offsetWidth;
        itemList[0].style.width = w + "px";
        dw = itemList[0].offsetWidth - w;
        w -= dw;
        itemList[0].style.width = w + "px";
        }

    // Mark menu as initialized.
    menu.isInitialized = true;
    }

function menuItemMouseover(event, menuId) {
    var item, menu, x, y;

    // Find the target item element and its parent menu element.
    if (browser.isIE)
        item = getContainerWith(window.event.srcElement, "A", "menuItem");
    else
        item = event.currentTarget;
    menu = getContainerWith(item, "DIV", "menu");

    // Close any active sub menu and mark this one as active.
    if (menu.activeItem != null)
        closeSubMenu(menu);
    menu.activeItem = item;

    // Highlight the item element.
    item.className += " menuItemHighlight";

    // Initialize the sub menu, if not already done.
    if (item.subMenu == null) {
        item.subMenu = document.getElementById(menuId);
        if (item.subMenu.isInitialized == null)
            menuInit(item.subMenu);
        }

    // Get position for submenu based on the menu item.
    x = getPageOffsetLeft(item) + item.offsetWidth;
    y = getPageOffsetTop(item);

    // Adjust position to fit in view.
    var maxX, maxY;

    if (browser.isNS) {
        maxX = window.scrollX + window.innerWidth;
        maxY = window.scrollY + window.innerHeight;
        }
    if (browser.isIE) {
        maxX = (document.documentElement.scrollLeft != 0 
          ? document.documentElement.scrollLeft
          : document.body.scrollLeft) +
            (document.documentElement.clientWidth != 0 
              ? document.documentElement.clientWidth
              : document.body.clientWidth);
        maxY = (document.documentElement.scrollTop != 0
          ? document.documentElement.scrollTop
          : document.body.scrollTop) + 
            (document.documentElement.clientHeight != 0 
              ? document.documentElement.clientHeight
              : document.body.clientHeight);
         }
    maxX -= item.subMenu.offsetWidth;
    maxY -= item.subMenu.offsetHeight;

    if (x > maxX)
        x = Math.max(0, x - item.offsetWidth - item.subMenu.offsetWidth +
          (menu.offsetWidth - item.offsetWidth));
    y = Math.max(0, Math.min(y, maxY));

    // Position and show it.
    item.subMenu.style.left = x + "px";
    item.subMenu.style.top  = y + "px";
    item.subMenu.style.visibility = "visible";

    // Stop the event from bubbling.
    if (browser.isIE)
        window.event.cancelBubble = true;
    else
        event.stopPropagation();
    }

function menuMouseover(event) {
    var menu;

    // Find the target menu element.
    if (browser.isIE)
        menu = getContainerWith(window.event.srcElement, "DIV", "menu");
    else
        menu = event.currentTarget;

    // Close any active sub menu.
    if (menu.activeItem != null)
        closeSubMenu(menu);
    }

function closeSubMenu(menu) {
    if (menu == null || menu.activeItem == null)
        return;

    // Recursively close any sub menus.
    if (menu.activeItem.subMenu != null) {
        closeSubMenu(menu.activeItem.subMenu);
        menu.activeItem.subMenu.style.visibility = "hidden";
        menu.activeItem.subMenu = null;
        }
    removeClassName(menu.activeItem, "menuItemHighlight");
    menu.activeItem = null;
    }







function pageMousedown(event) {
    var el;

    // If there is no active button, exit.
    if (activeButton == null)
        return;

    // Find the element that was clicked on.
    if (browser.isIE)
        el = window.event.srcElement;
    else
        el = (event.target.tagName ? event.target : event.target.parentNode);

    // If the active button was clicked on, exit.
    if (el == activeButton)
        return;

    // If the element is not part of a menu, reset and clear the active button.
    if (getContainerWith(el, "DIV", "menu") == null) {
        resetButton(activeButton);
        activeButton = null;
        }
    }

function buttonClick(event, menuId) {
    var button;
    // Get the target button element.
    if (browser.isIE)
        button = window.event.srcElement;
    else
        button = event.currentTarget;

    // Blur focus from the link to remove that annoying outline.
    button.blur();

    // Associate the named menu to this button if not already done.
    // Additionally, initialize menu display.
    if (button.menu == null) {
        button.menu = document.getElementById(menuId);
        if (button.menu.isInitialized == null)
            menuInit(button.menu);
        }

    // Reset the currently active button, if any.
    if (activeButton != null)
        resetButton(activeButton);

    // Activate this button, unless it was the currently active one.
    if (button != activeButton) {
        depressButton(button);
        activeButton = button;
        }
    else
        activeButton = null;

    return false;
    }

function depressButton(button) {
    var x, y;
    // Update the button's style class to make it look like it's
    // depressed.
    button.className += " menuButtonActive";

    // Position the associated drop down menu under the button and show it.
    x = getPageOffsetLeft(button);
    y = getPageOffsetTop(button) + button.offsetHeight;

    button.menu.style.left = x + "px";
    button.menu.style.top  = y + "px";
    button.menu.style.visibility = "visible";
    }

function resetButton(button) {
    // Restore the button's style class.
    removeClassName(button, "menuButtonActive");

    // Hide the button's menu, first closing any sub menus.
    if (button.menu != null) {
        closeSubMenu(button.menu);
        button.menu.style.visibility = "hidden";
        }
    }

function buttonMouseover(event, menuId) {
    var button;
    // Find the target button element.
    if (browser.isIE)
        button = window.event.srcElement;
    else
        button = event.currentTarget;

    // If any other button menu is active, make this one active instead.
    if (activeButton != null && activeButton != button)
        buttonClick(event, menuId);
    }

function Browser() {
    var ua, s, i;

    this.isIE    = false;  // Internet Explorer
    this.isNS    = false;  // Netscape
    this.version = null;

    ua = navigator.userAgent;

    s = "MSIE";
    if ((i = ua.indexOf(s)) >= 0) {
        this.isIE = true;
        this.version = parseFloat(ua.substr(i + s.length));
        return;
        }

    s = "Netscape6/";
    if ((i = ua.indexOf(s)) >= 0) {
        this.isNS = true;
        this.version = parseFloat(ua.substr(i + s.length));
        return;
        }

    // Treat any other "Gecko" browser as NS 6.1.
    s = "Gecko";
    if ((i = ua.indexOf(s)) >= 0) {
        this.isNS = true;
        this.version = 6.1;
        return;
        }
    }

var browser = new Browser();


function getContainerWith(node, tagName, className) {
    // Starting with the given node, find the nearest containing element
    // with the specified tag name and style class.
    while (node != null) {
        if (node.tagName != null && node.tagName == tagName &&
          hasClassName(node, className))
            return node;
        node = node.parentNode;
        }

    return node;
    }

function hasClassName(el, name) {
    var i, list;
    // Return true if the given element currently has the given class name.
    list = el.className.split(" ");
    for (i = 0; i < list.length; i++)
        if (list[i] == name)
            return true;
    return false;
    }

function removeClassName(el, name) {
    var i, curList, newList;
    if (el.className == null)
        return;
    // Remove the given class name from the element's className property.
    newList = new Array();
    curList = el.className.split(" ");
    for (i = 0; i < curList.length; i++)
        if (curList[i] != name)
            newList.push(curList[i]);
    el.className = newList.join(" ");
    }

function getPageOffsetLeft(el) {
    var x;
    // Return the x coordinate of an element relative to the page.
    x = el.offsetLeft;
    if (el.offsetParent != null)
        x += getPageOffsetLeft(el.offsetParent);
    return x;
    }

function getPageOffsetTop(el) {
    var y;
    // Return the x coordinate of an element relative to the page.
    y = el.offsetTop;
    if (el.offsetParent != null)
        y += getPageOffsetTop(el.offsetParent);
    return y;
    }

// Capture mouse clicks on the page so any active button can be deactivated.
if (browser.isIE)
    document.onmousedown = pageMousedown;
else
    document.addEventListener("mousedown", pageMousedown, true);