//----------------------------------------------------------------------------
// Code to determine the browser and version.
//----------------------------------------------------------------------------

function Browser() 
{
	var ua, s, i;
	
	this.isIE    = false;  // Internet Explorer
	this.isOP    = false;  // Opera
	this.isNS    = false;  // Netscape
	this.version = null;
	
	ua = navigator.userAgent;
	
	s = "Opera";
	if ((i = ua.indexOf(s)) >= 0) 
	{
		this.isOP = 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 Netscape 6.1.

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

	s = "MSIE";
	if ((i = ua.indexOf(s))) 
	{
		this.isIE = true;
		this.version = parseFloat(ua.substr(i + s.length));
		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 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 pageResize() 
{
	// If there is no active button, exit.
	if (activeButton == null)
		return;

	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 != null) 
		{
			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 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;
	
	if (button.menu != null)
	{
		// 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;

		// For IE, adjust position.
		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) 
{
	// 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";
	}
}

//----------------------------------------------------------------------------
// Code to handle the menus and sub menus.
//----------------------------------------------------------------------------

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 != null && menu.activeItem != null)
		closeSubMenu(menu);
}

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

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

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

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

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

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

		// Adjust position to fit in view.
		var maxX, maxY;
	
		if (browser.isIE) 
		{	
			maxX = Math.max(document.documentElement.scrollLeft, document.body.scrollLeft) +
				(document.documentElement.clientWidth != 0 ? document.documentElement.clientWidth : document.body.clientWidth);
			maxY = Math.max(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 -= itm.subMenu.offsetWidth;
		maxY -= itm.subMenu.offsetHeight;

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

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

	// 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;
}

//----------------------------------------------------------------------------
// Code to initialize menus.
//----------------------------------------------------------------------------

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";
			// For Opera, remove the negative right margin to fix a display bug.
			
			if (browser.isOP)
				arrowEl.style.marginRight = "0px";
		}
	}

	// 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;
}

//----------------------------------------------------------------------------
// General utility functions.
//----------------------------------------------------------------------------

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;
}