/******************************************************************************
 * Menu Bar                                                                   *
 *                                                                            *
 * Do not remove this notice.                                                 *
 *                                                                            *
 * Copyright 2000-2004 by Mike Hall                                           *
 * Please see http://www.brainjar.com for terms of use.                       *
 ******************************************************************************/

//----------------------------------------------------------------------------
// 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 = "Netscape";
   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 = 'menuHOME';
// var activeButton;

// 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 = 'menuHOME';
    }
}

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 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;

  // 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;
    }

  //
  // The amount added or subtracted from the left and top is determined by
  // the computer:
  //    My laptop has to have x reduced by 4 and y reduced by 106
  //    My PC     has to have x reduced by 2 and y increased by 2
  //
  button.menu.style.left       = (x-     2) + "px";
  button.menu.style.top        = (y-  (-2)) + "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.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 = 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 -= 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;

  // 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;
}