
var menu, titles, submenus, arrows, bypixels; //定义指定的菜单数组变量
var heights = new Array();
var speed=25;  //加载菜单项的速度  

var n = navigator.userAgent;

if(/Opera/.test(n)) 
{
    bypixels = 2;
}
else if(/Firefox/.test(n)) 
{
    bypixels = 3;
}
else if(/MSIE/.test(n)) 
{
   bypixels = 2;
}

//展开所有的菜单项
function slash_expandall()
{
    if (typeof menu!="undefined")
    {
	    for(i=0; i<Math.max(titles.length, submenus.length); i++)
	    {
	    	titles[i].className="CurrentItem";
		    arrows[i].src = imgpath+"dropdown.gif";
		    submenus[i].style.display="";
		    submenus[i].style.height = heights[i]+"px";
	    }
    }
}


//收缩所有菜单项
function slash_contractall()
{
	if (typeof menu!="undefined")
	{
		if(expandall == false)
		{
			for(i=0; i<Math.max(titles.length, submenus.length); i++)
			{
				currents[i].className="NoSelect";
				arrows[i].src = imgpath+"dropdown.gif";
				submenus[i].style.display="none";
				submenus[i].style.height = 0+"px";
				submenusli[i].style.display = "none";
			}
		}
	}
}


//初始化函数
function init(showmenuid,showmenuidlist){

    menu = getElementsByClassName("NavManagerMenu", "div", document)[0];
    titles = getElementsByClassName("CurrentItem", "li", menu);
    arrows = getElementsByClassName("arrow", "img", menu);
    submenus = getElementsByClassName("Submenu1", "div", menu);
    submenusli = getElementsByClassName("Submenu", "li", menu);
    currents = getElementsByClassName("current", "div", menu);
   
    
   for(i=0; i<Math.max(titles.length, submenus.length); i++) 
   {
        heights[i] = submenus[i].offsetHeight;
        submenus[i].style.height = submenus[i].offsetHeight+"px";
        
        submenus[i].style.display = "none";
        currents[i].style.display = "none";
        titles[i].style.display = "none";
        currents[i].className="NoSelect";
        submenusli[i].style.display = "none";
        /*alert(i); */
	}

	//当存在初始菜单项id串参数时
	
	if((showmenuid!=null)&&(showmenuid!=""))
	{
	    i = 0;
	    var menuidarray = showmenuidlist.split(',')
	    for(i = 0; i< menuidarray.length ;i++)
	    {
            for(j = 0 ; j < titles.length ; j++)
            {
                if(titles[j].getAttribute("forid") == menuidarray[i])
                {
                    titles[j].style.display = "block";
                    if(menuidarray[i]!=showmenuid)
	                {
	                   submenus[j].style.display = "none";
                       currents[j].style.display = "block";
                       arrows[j].src = imgpath+"dropdown.gif";
                       submenusli[j].style.display = "none";
                    }
                    else
                    {
                       submenus[j].style.display = "block";
                       currents[j].style.display = "block";
                       arrows[j].src = imgpath+"dropup.gif";
                       currents[j].className = "current";
                       submenusli[j].style.display = "block";
                    }
                    break;
                }
            }
        }
	}

    window_load();
}

//存储菜单项状态
function restore() 
{
    if(getcookie("menu") != null) 
    {
        var hidden = getcookie("menu").split(",");
        for(var i in hidden) 
        {
            titles[hidden[i]].className = "CurrentItem";
            submenus[hidden[i]].style.height = "0px";
            submenus[hidden[i]].style.display = "none";
            arrows[hidden[i]].src =imgpath+"dropup.gif";
        }
    }
}


//定向到指定的菜单项进行相应操作
function gomenu(e) 
{
    if (!e)
    {
       e = window.event;
    }   
      
    var ce = (e.target) ? e.target : e.srcElement;
 
    var sm ;
  
    //找到当前菜单项在数组中的位置,用于下面显示或隐藏判断
    for(var i in currents) 
    {
        if((arrows[i] == ce)||(currents[i] == ce.parentNode)||(currents[i] == ce.parentNode.parentNode)) 
        {
            sm = i;
        }
    }
   
    if(sm >=0)
    {
       //当前菜单项是展示状态时 
       if(parseInt(submenus[sm].style.height) > parseInt(heights[sm])) 
       {
          hidemenu(sm);
       }
       else
       {
            //当前菜单项是展示状态时
            if(submenus[sm].style.display=="block")
            {
                 hidemenu(sm);
            }
            else
            {
                 //显示指定的菜单项
                 slash_contractall();
                 currents[sm].className = "current";
                 showmenu(sm);
            }
       }
   }
}


//隐藏指定的菜单元素
function hidemenu(sm) 
{
    var nr = submenus[sm].getElementsByTagName("a").length*bypixels+speed;
    submenus[sm].style.height = (parseInt(submenus[sm].style.height)-nr)+"px";
    
    var to = setTimeout("hidemenu("+sm+")", 5);
    if(parseInt(submenus[sm].style.height) <= nr)
    {
        clearTimeout(to);
        submenus[sm].style.display = "none";
        submenus[sm].style.height = 0+"px";
        arrows[sm].src = imgpath+"dropdown.gif";
        submenusli[sm].style.display = "none";
        currents[sm].className = "NoSelect";
    }
}

//显示指定的菜单元素
function showmenu(sm) 
{
    var nr = submenus[sm].getElementsByTagName("a").length*bypixels+speed;
    submenus[sm].style.display = "block";
    submenus[sm].style.height = (parseInt(submenus[sm].style.height)+nr)+"px";
    var to = setTimeout("showmenu("+sm+")", 5);
    if(parseInt(submenus[sm].style.height) > (parseInt(heights[sm])-nr)) 
    {
        clearTimeout(to);
        submenus[sm].style.height = heights[sm]+"px";
        arrows[sm].src = imgpath+"dropup.gif";
        submenusli[sm].style.display = "block";
    }
}

//保存菜单元素
function store()
{
    var hidden = new Array();
    for(var i in titles) 
    {
        if(titles[i].className == "CurrentItem")
        {
            hidden.push(i);
        }
    }
    putcookie("menu", hidden.join(","), 5);
}


//获取指定样式的元素
function getElementsByClassName(strClassName, strTagName, oElm)
{
    var arrElements = (strTagName == "*" && document.all)? document.all : oElm.getElementsByTagName(strTagName);
    var arrReturnElements = new Array();
    strClassName = strClassName.replace(/\-/g, "\\-");
    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
    var oElement;
    for(var i=0; i<arrElements.length; i++)
    {
        oElement = arrElements[i];      
        if(oRegExp.test(oElement.className))
        {
            arrReturnElements.push(oElement);
        }   
    }
    return (arrReturnElements)
}

function getElements(strTagName, oElm)
{
    var arrElements = (strTagName == "*" && document.all)? document.all : oElm.getElementsByTagName(strTagName);
    return arrElements;
}

function putcookie(c_name,value,expiredays) 
{
    var exdate=new Date();
    exdate.setDate(exdate.getDate()+expiredays);
    document.cookie = c_name + "=" + escape(value) + ((expiredays==null) ? "" : ";expires="+exdate);
}

function getcookie(c_name)
{
    if(document.cookie.length > 0) 
    {
        var c_start = document.cookie.indexOf(c_name + "=");
        if(c_start != -1) 
        {
            c_start = c_start + c_name.length + 1;
            var c_end = document.cookie.indexOf(";",c_start);
            if(c_end == -1)
                c_end = document.cookie.length;
            return unescape(document.cookie.substring(c_start, c_end));
        }
    }
    return null;
}

