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 = "Safari";
    if ((i = ua.indexOf(s)) >= 0) {
        this.isSA = true;
        this.version = 1.0;
        return;
    }

    s = "Gecko";
    if ((i = ua.indexOf(s)) >= 0) {
        this.isNS = true;
        this.version = 6.1;
        return;
    }
}



var browser = new Browser();

var activeButton = null;

if (browser.isIE)
    document.onmousedown = pageMousedown;
else
    document.addEventListener("mousedown", pageMousedown, true);



function pageMousedown(event) {

    var el;

    if (activeButton == null)
    return;

    if (browser.isIE)
        el = window.event.srcElement;
    else
        el = (event.target.tagName ? event.target : event.target.parentNode);

    if (el == activeButton)
        return;

    if (getContainerWith(el, "DIV", "MENU") == null) {
        resetButton(activeButton);
        activeButton = null;
    }
}


function buttonClick(event, menuId) {

    var button;

    if (browser.isIE)
        button = window.event.srcElement;
    else
        button = event.currentTarget;

    button.blur();

    if (button.menu == null) {
        button.menu = document.getElementById(menuId);

        if (button.menu.isInitialized == null)
            menuInit(button.menu);
    }

    if (activeButton != null)
        resetButton(activeButton);

    if (button != activeButton) {
        depressButton(button);
        activeButton = button;
    }
    else
        activeButton = null;

    return false;
}


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 depressButton(button) {

    var x, y;

    x = getPageOffsetLeft(button);
    y = getPageOffsetTop(button) + button.offsetHeight;

    if (browser.isSA){
        y -=5;
    }

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


function resetButton(button) {

    //  removeClassName(button, "MENUBUTTONACTIVE");

    if (button.menu != null) {
        closeSubMenu(button.menu);
        button.menu.style.visibility = "hidden";
    }
}


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 menuItemMouseover(event, menuId) {

    var item, menu, x, y;

    if (browser.isIE)
        item = getContainerWith(window.event.srcElement, "A", "MENUITEM");
    else
        item = event.currentTarget;
    menu = getContainerWith(item, "DIV", "MENU");

    if (menu.activeItem != null)
        closeSubMenu(menu);
    menu.activeItem = item;

    //  item.className += " MENUITEMHIGHLIGHT";

    if (item.subMenu == null) {
        item.subMenu = document.getElementById(menuId);
        if (item.subMenu.isInitialized == null)
            menuInit(item.subMenu);
    }

    x = getPageOffsetLeft(item) + item.offsetWidth;
    y = getPageOffsetTop(item)-3.0;

    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);
    }
    if (browser.isSA) {
        maxX = window.scrollX + window.innerWidth;
        maxY = window.scrollY + window.innerHeight ;
    }

      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));
    if (browser.isSA) {
        item.subMenu.style.left = (x) + "px";
        item.subMenu.style.top  = (y) + "px";
    }else{
        item.subMenu.style.left = x + "px";
        item.subMenu.style.top  = y + "px";
    }
    item.subMenu.style.visibility = "visible";

    if (browser.isIE)
        window.event.cancelBubble = true;
    else
        event.stopPropagation();
}




function closeSubMenu(menu) {

    if (menu == null || menu.activeItem == null)
        return;

    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 menuInit(menu) {

    var itemList, spanList;
    var textEl, arrowEl;
    var itemWidth;
    var w, dw;
    var i, j;

    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";
            }
    }

    itemList = menu.getElementsByTagName("A");
    if (itemList.length > 0)
        itemWidth = itemList[0].offsetWidth;
    else
        return;

    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";
    }

    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";
    }
    menu.isInitialized = true;
}



function getContainerWith(node, tagName, className) {

    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;

    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;

    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;

    x = el.offsetLeft;
    if (el.offsetParent != null)
        x += getPageOffsetLeft(el.offsetParent)+0.5;

    return x;
}



function getPageOffsetTop(el) {

    var y;

    y = el.offsetTop;
    if (el.offsetParent != null)
        y += getPageOffsetTop(el.offsetParent);

    return y;
}