var IE4plus = false;

var NS6plus = false;

var Opera   = false;



if (navigator.userAgent.indexOf('Opera') > 0) 

{

    Opera = true;

}



if (!Opera)

{

    if (document.all)

    {

        IE4plus = true;

    }



    else if (document.childNodes) 

    {

        NS6plus = true;

    }

}



if (IE4plus)

{

    sDisplayShow = '';

    sDisplayHide = 'none';

}

else if (NS6plus)

{

    sDisplayShow = 'block';

    sDisplayHide = 'none';

}



imgPlus    = new Image(16, 15);  imgPlus.src    = 'images/squareplus.gif';

imgMinus   = new Image(16, 15);  imgMinus.src   = 'images/squareminus.gif';

imgPageTab = new Image( 9,  9);  imgPageTab.src = 'images/pagetab.gif';



var oTargetItem       ;

var oTargetPage       ;

var oTargetQuery      ;

var sGroupName        = '';

var sHomePage         = 'index.htm';

var bParentPage       = false;

var bConvertParent    = false;

var bMatchQueryString = false;



function iNavigate_ConvertParent(convert)

{

    bConvertParent = convert == true;

}



function iNavigate_MatchQueryString(match)

{

    bMatchQueryString = match == true;

}



function iNavigate_SetGroup(group)

{

    sGroupName = group;

}



function iNavigate_SetHomePage(page)

{

    sHomePage = page;

}



function iNavigate_SetParentPage(page, querystring)

{

    if (page)

    {

        if ((typeof page == 'string') || (page.source))

        {

            bParentPage = true;



            oTargetPage = page.toLowerCase();



            if (querystring)

            {

                if ((typeof querystring == 'string') || (querystring.source))

                {

                    oTargetQuery = querystring.toLowerCase();

                }

            }

        }

    }

}



function iNavigate_BeforeLoad()

{

    if (!IE4plus && !NS6plus) return;



    var i, j, k;



    var oImagePageTab;



    xSpan1 = GetElements(document, 'iNavigateSpanLevel1');



    loop1:



    for (i=0; i < xSpan1.length; i++)

    {

        oSpan1 = xSpan1[i];



        oSpan1.setAttribute('menuNo', i);



        xItem1 = GetElements(oSpan1, 'iNavigateItemLevel1');



        for (j=0; j < xItem1.length; j++)

        {

            oItem1 = xItem1[j];



            if (LinkMatchesTarget(oItem1) == true)

            {

                if (IE4plus) oImagePageTab = oSpan1.all[0];

                if (NS6plus) oImagePageTab = oSpan1.childNodes[1];

    

                oTargetItem = oItem1;

                

                SetMenuCookie(oSpan1, sGroupName, true);



                break loop1;

            }

        }



        xItem2 = GetElements(oSpan1, 'iNavigateItemLevel2');

        

        for (j=0; j < xItem2.length; j++)

        {

            oItem2 = xItem2[j];



            if (LinkMatchesTarget(oItem2) == true)

            {

                if (IE4plus) oImagePageTab = document.all[oItem2.sourceIndex - 2];

                if (NS6plus) oImagePageTab = oItem2.previousSibling.previousSibling;



                oTargetItem = oItem2;

                

                SetMenuCookie(oSpan1, sGroupName, true);



                break loop1;

            }

        }

    }



    if (oImagePageTab) 

    {

        if (oImagePageTab.tagName == 'IMG') 

        {

            oImagePageTab.src = imgPageTab.src;

        }

    }



    for (i=0; i < xSpan1.length; i++)

    {

        oSpan1 = xSpan1[i];



        oSpan1.setAttribute('menuNo', i);



        xSpan2 = GetElements(oSpan1, 'iNavigateSpanLevel2');



        if (xSpan2.length > 0)

        {

            oSpan2 = xSpan2[0];



            if (IE4plus)

            {

                oSpan1.onclick = iNavigate_MenuClick

                oSpan2.onclick = iNavigate_CancelEventPropagation

            }            

            else if (NS6plus)

            {

                oSpan1.addEventListener('click', iNavigate_MenuClick, false);

                oSpan2.addEventListener('click', iNavigate_CancelEventPropagation, false);

            }



            if (IE4plus) oSpan1.style.cursor = 'hand';



            if (IE4plus) oImagePlusMinus = oSpan1.all[1];

            if (NS6plus) oImagePlusMinus = oSpan1.childNodes[2];

   

            if (GetMenuCookie(oSpan1, sGroupName) == true)

            {

                oSpan2.style.display = sDisplayShow;



                oImagePlusMinus.src = imgMinus.src;



                oImagePlusMinus.title = "Close Menu";

            }

            else

            {

                oSpan2.style.display = sDisplayHide;



                oImagePlusMinus.src = imgPlus.src;



                oImagePlusMinus.title = "Open Menu";

            }

        }

    }

}





function LinkMatchesTarget(oLink)

{

    if (!oLink.pathname) return false;



    if (!bParentPage)

    {

        oTargetPage  = GetURLFileName(window.location.pathname, sHomePage);



        if (bMatchQueryString) 

        {

            oTargetQuery = window.location.search.toLowerCase();

        }

    }



    var sFileName    = GetURLFileName(oLink.pathname);

    var sQueryString = GetURLQueryString(oLink.search);



    if (typeof oTargetPage == 'string')

    {

        if (oTargetPage != sFileName) return false;

    }

    else

    {

        if (!oTargetPage.test(sFileName)) return false

    }



    if (oTargetQuery)

    {

        if (typeof oTargetQuery == 'string')

        {

            if (oTargetQuery != sQueryString) return false;

        }

        else

        {

            if (!oTargetQuery.test(sQueryString)) return false

        }

    }



    return true;

}



function iNavigate_AfterLoad()

{

    if (!IE4plus && !NS6plus) return;



    if (bParentPage && !bConvertParent) return;



    if (oTargetItem )

    {

        if (IE4plus)

        {

            // we do this here for IE4 compatibility, in IE5+ we could do it earlier



            oTargetItem.outerHTML = '<em class=iNavigateCurrentPage>' + oTargetItem.innerHTML + '</em>';

        }



        else if (NS6plus)

        {

            oElement = document.createElement('EM');



            oElement.setAttribute('class', 'iNavigateCurrentPage');



            var oNode = oTargetItem.firstChild;



            while (oNode)  

            {

                oElement.appendChild(oNode.cloneNode(true));



                oNode = oNode.nextSibling;

            }

    

            oTargetItem.parentNode.replaceChild(oElement, oTargetItem);

        }

    }

}



function iNavigate_MenuClick(evt)

{

    if (!IE4plus && !NS6plus) return;



    var source;



    if (IE4plus)

    {

        source = window.event.srcElement;

    

        while (source.tagName != 'SPAN')

        {

            source = source.parentElement;

        }

    }

    else if (NS6plus)

    {

        source = evt.currentTarget;

    }



    if (source)

    {

        xSpan2 = GetElements(source, 'iNavigateSpanLevel2');



        if (xSpan2.length > 0)

        {

            oSpan2 = xSpan2[0];

    

            if (IE4plus) oImagePlusMinus = source.all[1];

            if (NS6plus) oImagePlusMinus = source.childNodes[2];



            if (oSpan2.style.display == sDisplayShow)

            {

                SetMenuCookie(source, sGroupName, false);



                oSpan2.style.display = sDisplayHide;



                oImagePlusMinus.src = imgPlus.src;



                oImagePlusMinus.title = "Open Menu";

            }

            else

            {

                SetMenuCookie(source, sGroupName, true);



                oSpan2.style.display = sDisplayShow;



                oImagePlusMinus.src = imgMinus.src;



                oImagePlusMinus.title = "Close Menu";

            }

        }

    }

}



function iNavigate_CancelEventPropagation(evt)

{

    if (!IE4plus && !NS6plus) return;



    if (IE4plus)

    {

        window.event.cancelBubble=true;

    }



    else if (NS6plus)

    {

        evt.cancelBubble = true;

    }

}



function SetMenuCookie(oMenu, sGroupName, bValue)

{

    var sValue = bValue ? '1' : '0';



    document.cookie = 'iNavigate_' + sGroupName + '_' + oMenu.getAttribute('menuNo') + '=' + sValue + '; path=/';



    oMenu.setAttribute('menuOpen', sValue);

}



function GetMenuCookie(oMenu, sGroupName)

{

    var bValue = false;



    bValue = document.cookie.indexOf('iNavigate_' + sGroupName + '_' + oMenu.getAttribute('menuNo') + '=1') != -1;



    if (!bValue) 

    {

        if (oMenu.getAttribute('menuOpen') == '1') bValue = true;

    }



    return bValue;

}



function GetURLFileName(URL, sDefault)

{

    var sBuffer = '';



    var nPos = URL.indexOf('?');



    if (nPos >= 0) 

    {

        sBuffer = URL.substr(0, nPos);

    }

    else

    {

        sBuffer = URL;

    }



    sBuffer = sBuffer.substr(sBuffer.lastIndexOf('\\') + 1);

    sBuffer = sBuffer.substr(sBuffer.lastIndexOf('/') + 1);

    sBuffer = unescape(sBuffer.toLowerCase());



    if (sBuffer.length == 0) sBuffer = sDefault;



    return sBuffer;

}





function GetURLQueryString(URL)

{

    var sBuffer = '';



    var nPos = URL.indexOf('?');



    if (nPos >= 0) sBuffer = URL.substr(nPos).toLowerCase();



    return sBuffer;

}



function GetElements(element, id)

{

    var i;

    var elements = new Array();



    if (IE4plus)

    {

        if (element.all[id])

        {

            elements = element.all[id];



            if (!elements.length) elements = [element.all[id]];

        }

    }

    else if (NS6plus)

    {

        _GetElementsDOM2(elements, element, id);

    }

    return elements;

}





function _GetElementsDOM2(elements, element, id)

{

    var i;



    for (i=0; i < element.childNodes.length; i++)

    {

        if (element.childNodes[i].id == id)

        {

            elements.push(element.childNodes[i]);

        }

        else

        {

            _GetElementsDOM2(elements, element.childNodes[i], id);

        }

    }

}