js_top.files/menu.js

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//more javascript from http://www.smallrain.net
var remember = true; //Remember menu states, and restore them on next visit.

var menu, titles, submenus, arrows, bypixels;
var heights = new Array();

var n = navigator.userAgent;
if(/Opera/.test(n)) bypixels = 2;
else if(/Firefox/.test(n)) bypixels = 3;
else if(/MSIE/.test(n)) bypixels = 2;

function init(){
    menu = getElementsByClassName("sdmenu", "div", document)[0];
    titles = getElementsByClassName("title", "span", menu);
    submenus = getElementsByClassName("submenu", "div", menu);
    arrows = getElementsByClassName("arrow", "img", menu);
    for(i=0; i<Math.max(titles.length, submenus.length); i++) {
        titles[i].onclick = gomenu;
        arrows[i].onclick = gomenu;
        heights[i] = submenus[i].offsetHeight;
        submenus[i].style.height = submenus[i].offsetHeight+"px";
    }
    if(remember) restore();
}

function restore() {
    if(getcookie("menu") != null) {
        var hidden = getcookie("menu").split(",");
        for(var i in hidden) {
            titles[hidden[i]].className = "titlehidden";
            submenus[hidden[i]].style.height = "0px";
            submenus[hidden[i]].style.display = "none";
            /////////////////注意修改图片相应路径//////////
            arrows[hidden[i]].src = "images/collapsed.gif";
        }
    }
}

function gomenu(e) {
    if (!e)
        var e = window.event;
    var ce = (e.target) ? e.target : e.srcElement;
    var sm;
    for(var i in titles) {
        if(titles[i] == ce || arrows[i] == ce)
            sm = i;
    }
    if(parseInt(submenus[sm].style.height) > parseInt(heights[sm])-2) {
        hidemenu(sm);
    } else if(parseInt(submenus[sm].style.height) < 2) {
        titles[sm].className = "title";
        showmenu(sm);
    }
}

function hidemenu(sm) {
    var nr = submenus[sm].getElementsByTagName("a").length*bypixels;
    submenus[sm].style.height = (parseInt(submenus[sm].style.height)-nr)+"px";
    var to = setTimeout("hidemenu("+sm+")", 30);