var sUserAgent = navigator.userAgent.toLowerCase();
var isIE=document.all?true:false;
var isNS4=document.layers?true:false;
var isOp=(sUserAgent.indexOf('opera')!=-1)?true:false;
var isMac=(sUserAgent.indexOf('mac')!=-1)?true:false;
var isMoz=(sUserAgent.indexOf('mozilla/5')!=-1&&sUserAgent.indexOf('opera')==-1&&sUserAgent.indexOf('msie')==-1)?true:false;
var isNS6=(sUserAgent.indexOf('netscape6')!=-1&&sUserAgent.indexOf('opera')==-1&&sUserAgent.indexOf('msie')==-1)?true:false;
var dom=document.getElementById?true:false;

/* sets time until menus disappear in milliseconds */
var iMenuTimeout=500;

var aMenus=new Array;
var oMenuTimeout;
var iMainMenusLength=0;

/* the following boolean controls the z-index property if needed */
/* if is only necessary if you have multiple mainMenus in one file that are overlapping */
/* set bSetZIndeces to true (either here or in the HTML) and the main menus will have a z-index set in descending order so that preceding ones can overlap */
/* the integer iStartZIndexAt controls z-index of the first main menu */
var bSetZIndeces=true;
var iStartZIndexAt=1000;
var aMainMenus=new Array;

/* load up the submenus */
function loadMenus(){
        if(!dom)return;
        var aLists=document.getElementsByTagName('ul');
        for(var i=0;i<aLists.length;i++){
                if(aLists[i].className=='navMenu')aMenus[aMenus.length]=aLists[i];
        }
        var aAnchors=document.getElementsByTagName('a');
        var aItems = new Array;
        for(var i=0;i<aAnchors.length;i++){
                if(aAnchors[i].className=='navItem')aItems[aItems.length] = aAnchors[i];
        }
        var sMenuId=null;
        var oParentMenu=null;
        var aAllElements=document.body.getElementsByTagName("*");
        if(isIE)aAllElements=document.body.all;
        /* loop through navItem and navMenus and dynamically assign their IDs */
        /* each relies on it's parent's ID being set before it */
        for(var i=0;i<aAllElements.length;i++){
                if(aAllElements[i].className.indexOf('mainMenu')!=-1){
                        /* load up main menus collection */
                        if(bSetZIndeces)aMainMenus[aMainMenus.length]=aAllElements[i];
                }
                if(aAllElements[i].className=='navItem'){
                        oParentMenu = aAllElements[i].parentNode.parentNode;
                        if(!oParentMenu.childMenus) oParentMenu.childMenus = new Array;
                        oParentMenu.childMenus[oParentMenu.childMenus.length]=aAllElements[i];
                        if(aAllElements[i].id==''){
                                if(oParentMenu.className=='mainMenu'){
                                        aAllElements[i].id='navItem_'+iMainMenusLength;
                                        //alert(aAllElements[i].id);
                                        iMainMenusLength++;
                                }else{
                                        aAllElements[i].id=oParentMenu.id.replace('Menu','Item')+'.'+oParentMenu.childMenus.length;
                                }
                        }
                } else if(aAllElements[i].className=='navMenu'){
                        oParentItem = aAllElements[i].parentNode.firstChild;
                        aAllElements[i].id = oParentItem.id.replace('Item','Menu');
                }
        }
        /* dynamically set z-indeces of main menus so they won't underlap */
        for(var i=aMainMenus.length-1;i>=0;i--){
                aMainMenus[i].style.zIndex=iStartZIndexAt-i;
        }
        /* set menu item properties */
        for(var i=0;i<aItems.length;i++){
                sMenuId=aItems[i].id;
                sMenuId='navMenu_'+sMenuId.substring(8,sMenuId.lastIndexOf('.'));
                /* assign event handlers */
                /* eval() used here to avoid syntax errors for function literals in Netscape 3 */
                eval('aItems[i].onmouseover=function(){modClass(true,this,"activeItem");window.clearTimeout(oMenuTimeout);showMenu("'+sMenuId+'");};');
                eval('aItems[i].onmouseout=function(){modClass(false,this,"activeItem");window.clearTimeout(oMenuTimeout);oMenuTimeout=window.setTimeout("hideMenu(\'all\')",iMenuTimeout);}');
                eval('aItems[i].onfocus=function(){this.onmouseover();}');
                eval('aItems[i].onblur=function(){this.onmouseout();}');
                //aItems[i].addEventListener("keydown",function(){keyNav(this,event);},false);
        }
        var sCatId=0;
        var oItem;
        for(var i=0;i<aMenus.length;i++){
                /* assign event handlers */
                /* eval() used here to avoid syntax errors for function literals in Netscape 3 */
                eval('aMenus[i].onmouseover=function(){window.clearTimeout(oMenuTimeout);}');
                eval('aMenus[i].onmouseout=function(){window.clearTimeout(oMenuTimeout);oMenuTimeout=window.setTimeout("hideMenu(\'all\')",iMenuTimeout);}');
                sCatId=aMenus[i].id;
                sCatId=sCatId.substring(8,sCatId.length);
                oItem=document.getElementById('navItem_'+sCatId);
                if(oItem){
                        if(!isOp && !(isMac && isIE) && oItem.parentNode)modClass(true,oItem.parentNode,"hasSubMenu");
                        else modClass(true,oItem,"hasSubMenu");
                        /* assign event handlers */
                        eval('oItem.onmouseover=function(){window.clearTimeout(oMenuTimeout);showMenu("navMenu_'+sCatId+'");}');
                        eval('oItem.onmouseout=function(){window.clearTimeout(oMenuTimeout);oMenuTimeout=window.clearTimeout(oMenuTimeout);oMenuTimeout=window.setTimeout(\'hideMenu("navMenu_'+sCatId+'")\',iMenuTimeout);}');
                        eval('oItem.onfocus=function(){window.clearTimeout(oMenuTimeout);showMenu("navMenu_'+sCatId+'");}');
                        eval('oItem.onblur=function(){window.clearTimeout(oMenuTimeout);oMenuTimeout=window.clearTimeout(oMenuTimeout);oMenuTimeout=window.setTimeout(\'hideMenu("navMenu_'+sCatId+'")\',iMenuTimeout);}');
                        //oItem.addEventListener("keydown",function(){keyNav(this,event);},false);
                }
        }
}

/* this will append the loadMenus function to any previously assigned window.onload event */
/* if you reassign this onload event, you'll need to include this or execute it after all the menus are loaded */
function newOnload(){
        if(typeof previousOnload=='function')previousOnload();
        loadMenus();
}
var previousOnload;
if(window.onload!=null)previousOnload=window.onload;
window.onload=newOnload;

/* show menu and hide all others except ancestors of the current menu */
function showMenu(sWhich){
        var oWhich=document.getElementById(sWhich);
        if(!oWhich){
                hideMenu('all');
                return;
        }
        var aRootMenus=new Array;
        aRootMenus[0]=sWhich
        var sCurrentRoot=sWhich;
        var bHasParentMenu=false;
        if(sCurrentRoot.indexOf('.')!=-1){
                bHasParentMenu=true;
        }
        /* make array of this menu and ancestors so we know which to leave exposed */
        /* ex. from ID string "navMenu_12.3.7.4", extracts menu levels ["12.3.7.4", "12.3.7", "12.3", "12"] */
        while(bHasParentMenu){
                if(sCurrentRoot.indexOf('.')==-1)bHasParentMenu=false;
                aRootMenus[aRootMenus.length]=sCurrentRoot;
                sCurrentRoot=sCurrentRoot.substring(0,sCurrentRoot.lastIndexOf('.'));
        }
        for(var i=0;i<aMenus.length;i++){
                var bIsRoot=false;
                for(var j=0;j<aRootMenus.length;j++){
                        var oThisItem=document.getElementById(aMenus[i].id.replace('navMenu_','navItem_'));
                        if(aMenus[i].id==aRootMenus[j])bIsRoot=true;
                }
                if(bIsRoot && oThisItem)modClass(true,oThisItem,'hasSubMenuActive');
                else modClass(false,oThisItem,'hasSubMenuActive');
                if(!bIsRoot && aMenus[i].id!=sWhich)modClass(false,aMenus[i],'showMenu');
        }
        modClass(true,oWhich,'showMenu');
        var oItem=document.getElementById(sWhich.replace('navMenu_','navItem_'));
        if(oItem)modClass(true,oItem,'hasSubMenuActive');
}

function hideMenu(sWhich){
        if(sWhich=='all'){
                /* loop backwards b/c WinIE6 has a bug with hiding display of an element when it's parent is already hidden */
                for(var i=aMenus.length-1;i>=0;i--){
                        var oThisItem=document.getElementById(aMenus[i].id.replace('navMenu_','navItem_'));
                        if(oThisItem)modClass(false,oThisItem,'hasSubMenuActive');
                        modClass(false,aMenus[i],'showMenu');
                }
        }else{
                var oWhich=document.getElementById(sWhich);
                if(oWhich)modClass(false,oWhich,'showMenu');
                var oThisItem=document.getElementById(sWhich.replace('navMenu_','navItem_'));
                if(oThisItem)modClass(false,oThisItem,'hasSubMenuActive');
        }
}

/* add or remove element className */
function modClass(bAdd,oElement,sClassName){
        if(bAdd){/* add class */
                if(oElement.className.indexOf(sClassName)==-1)oElement.className+=' '+sClassName;
        }else{/* remove class */
                if(oElement.className.indexOf(sClassName)!=-1){
                        if(oElement.className.indexOf(' '+sClassName)!=-1)oElement.className=oElement.className.replace(' '+sClassName,'');
                        else oElement.className=oElement.className.replace(sClassName,'');
                }
        }
        return oElement.className; /* return new className */
}

//document.body.addEventListener("keydown",function(){keyNav(event);},true);

function setBubble(oEvent){
        oEvent.bubbles = true;
}

function keyNav(oElement,oEvent){
        alert(oEvent.keyCode);
        window.status=oEvent.keyCode;
        return false;
}