//============================================================================
// Constants = Values that are dependent on other settings
var TRUE = 0;
var FALSE = 1;

var MENUBAR_ID = "MENUBAR";
var MENUBARITEM_ID = "MENUBARITEM";
var MENUBAR_GRAPHIC = "MENUBARGRAPHIC";

//============================================================================
// Global variables and their defaults
var g_strMenuBarGraphicsDir = "";
var g_fPageLoad = TRUE;

//============================================================================
// Functions to be called during the program

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
window.onresize = reloadPage;
window.onload = loadPage;

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function reloadPage()
{
        // Only in NS
        if( !document.all  )
        {
                // Only in version 4.1 and less; dont reload after a load
                if( (g_fPageLoad == FALSE) && ( (parseFloat( navigator.appVersion )) < 4.1 ) )
                        location.reload();
                if( (parseFloat( navigator.appVersion ) >= 4.1) )
                        location.reload();
                
                // Reset flag
                g_fPageLoad = FALSE;
        }
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function loadPage()
{
        // Needed for 4.1 and less browsers to stop reload after load but permit load after reload
        g_fPageLoad = TRUE;
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function createMenuBar()
{
        // Setup the menu container
        if( !this.MenuBarContainer )
                this.MenuBarContainer = new createMenuBarObject();
        return this.MenuBarContainer;
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function initMenuBarGraphics( a_strMenuBarGraphicsDir )
{
        g_strMenuBarGraphicsDir = a_strGraphicsDir;
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function createMenuBarObject()
{
        this.menuBarItems = new Array();                // List of menu bar items
        this.addMenuBarItem = addMenuBarItem;   // Add a menuitem to this object function       
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function createMenuBarItem( a_strText, a_strAction )
{
        this.PopMenu;                                                    // Pop menu associated with this menubar
        this.Text = a_strText;                                   // Text for this menu item
        this.Action = a_strAction;
        this.ImageOn = new Image();                              // Image when item is active
        this.ImageOff = new Image();                     // Image when item is inactive
        this.ItemImage = null;                                  
        this.ItemIndex = 0;
        
        this.setImageOn = setImageOn;                    // Function to turn on image
        this.setImageOff = setImageOff;                  // Function to turn off image
        this.setPopMenu = setPopMenu;                    // Function to set the associated pop up menu
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function addMenuBarItem( a_strText, a_strAction )
{
        this.menuBarItems[ this.menuBarItems.length ] = new createMenuBarItem( a_strText, a_strAction );
        return this.menuBarItems[ this.menuBarItems.length - 1];
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function setImageOn( a_strGraphicSrc )
{
   this.ImageOn.src = a_strGraphicSrc;
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function setImageOff( a_strGraphicSrc )
{
        this.ImageOff.src = a_strGraphicSrc;
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function setPopMenu( a_PopMenu )
{
        this.PopMenu = a_PopMenu;
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function initMenuBar()
{
        writeMenuBarHTML();
        posMenuBarItems();
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function writeMenuBarHTML()
{
        // Create the menu bars in the list
        var strOutput = "";

        // Get the menu to be created
        var menuBarCurrent = this.MenuBarContainer;
                
        // Loop through the menu items
        for( var nItemIndex = 0; nItemIndex < menuBarCurrent.menuBarItems.length; nItemIndex++ )
        {
                // Get the menubar item being worked on
                var menuBarItem = menuBarCurrent.menuBarItems[ nItemIndex ];
                        
                // Check if an image or label is used
                strOutput += '<A HREF="' + menuBarItem.Action + '"target=_top onMouseOver="menuBarItemMouseOver( window.MenuBarContainer.menuBarItems[' + nItemIndex + '] )" onMouseOut="menuBarItemMouseOut( window.MenuBarContainer.menuBarItems[' + nItemIndex + '] )"><IMG NAME="' + MENUBAR_GRAPHIC + nItemIndex + '" ALT="" BORDER="0" SRC="' + menuBarItem.ImageOff.src + '"></A>';
        }
                                
        // Output the menubar
        document.write( strOutput );
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function posMenuBarItems()
{
        // Get the menu 
        var menuBarCurrent = this.MenuBarContainer;

        // Loop through the menu items
        for( var nItemIndex = 0; nItemIndex < menuBarCurrent.menuBarItems.length; nItemIndex++ )
        {
                // Get the menu item
                var menuBarImg;
                if( document.all )
                        menuBarImg = this.document.images[ MENUBAR_GRAPHIC + nItemIndex ];
                else
                        menuBarImg = document.images[ MENUBAR_GRAPHIC + nItemIndex ];
                        
                // Hook into the menu system
                menuBarCurrent.menuBarItems[ nItemIndex ].ItemImage = menuBarImg;
                menuBarCurrent.menuBarItems[ nItemIndex ].ItemIndex = nItemIndex;
        }
}


/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function menuBarItemMouseOver( a_MenuItem )
{
        a_MenuItem.ItemImage.src = a_MenuItem.ImageOn.src;
        if( document.all )
        {
                var nLeft = 0;
                var nTop = 0;
                var fParentExists = true;
                var CurrentObject = a_MenuItem.ItemImage;
                while( fParentExists )
                {
                        nLeft += CurrentObject.offsetLeft;
                        nTop += CurrentObject.offsetTop;
                        if( CurrentObject.offsetParent.tagName != "BODY" )
                                CurrentObject = CurrentObject.offsetParent;
                        else
                                fParentExists = false;
                }
                showPopMenu( a_MenuItem.PopMenu, nLeft, nTop + a_MenuItem.ItemImage.height );
        }
        else
                showPopMenu( a_MenuItem.PopMenu, a_MenuItem.ItemImage.x, a_MenuItem.ItemImage.y + a_MenuItem.ItemImage.height );
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function menuBarItemMouseOut( a_MenuItem )
{
        a_MenuItem.PopMenu.closeWindow = TRUE;  
        setTimeout( 'deactivateImage( window.MenuBarContainer.menuBarItems[' + a_MenuItem.ItemIndex + '] )', 50 );
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function deactivateImage( a_MenuItem )
{
        if( a_MenuItem.PopMenu.closeWindow == TRUE )
        {
                a_MenuItem.ItemImage.src = a_MenuItem.ImageOff.src;
                hidePopMenu( a_MenuItem.PopMenu );
        }
}

/*----------------------------------------------------------------------------
----------------------------------------------------------------------------*/
function hidePopMenuCallBack( a_popMenu )
{
        // Loop through the menu items
        for( var nItemIndex = 0; nItemIndex < this.MenuBarContainer.menuBarItems.length; nItemIndex++ )
        {
                // Hook into the menu system
                if( this.MenuBarContainer.menuBarItems[ nItemIndex ].PopMenu.Text == a_popMenu.Text )
                        this.MenuBarContainer.menuBarItems[ nItemIndex ].ItemImage.src = this.MenuBarContainer.menuBarItems[ nItemIndex ].ImageOff.src;
        }
}