activateMenu = function(nav) {

    var navroot = document.getElementById(nav);

    var lis = navroot.getElementsByTagName("LI");

    for (i=0 ; i < lis.length ; i++) {

        if (lis[i].lastChild.tagName == "UL") {

            lis[i].onmouseover = function() {

                this.className += " over";

            }

            lis[i].onmouseout=function() {

                this.className = this.className.replace(" over", "");

            }

        }

    }

}

window.onload= function() {

    activateMenu('mainNav');

}



function Browser() {

var ua, s, i;

this.isIE = false;

this.isNS = false;

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();

//----------------------------------------------------------------------------

// Code for handling the menu bar and active button.

//----------------------------------------------------------------------------

var activeButton = null;

// 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);

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);

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;

if (browser.isIE)

button = window.event.srcElement;

else

button = event.currentTarget;

if (activeButton != null && activeButton != button)

buttonClick(event, menuId);

}

function depressButton(button) {

var x, y;

button.className += " menuButtonActive";

x = getPageOffsetLeft(button);

y = getPageOffsetTop(button) + button.offsetHeight;

if (browser.isIE) {

x += button.offsetParent.clientLeft;

y += button.offsetParent.clientTop;

}

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;

if (browser.isIE)

menu = getContainerWith(window.event.srcElement, "DIV", "menu");

else

menu = event.currentTarget;

if (menu.activeItem != null)

closeSubMenu(menu);

}

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.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.isOP) {

    maxX = document.documentElement.scrollLeft + window.innerWidth;

    maxY = document.documentElement.scrollTop  + window.innerHeight;

  }

  if (browser.isNS) {

    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));



  // 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 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";

}

}

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);

return x;

}

function getPageOffsetTop(el) {

var y;

y = el.offsetTop;

if (el.offsetParent != null)

y += getPageOffsetTop(el.offsetParent);

return y;

}