/*
Author : Audi
http://audi.tw
Date:Sep 2008, v0.2
歡迎應用於無償用途散播，並請勿移除本版權宣告
*/
var bVer = parseInt(navigator.appVersion);
var bName = navigator.appName.toLowerCase();
var _agent = navigator.userAgent.toLowerCase();

_slideMenu_ie6 = (_agent.indexOf("msie 6.0") != -1);
_slideMenu_ie7 = (_agent.indexOf("msie 7.0") != -1);

_slideMenu_isIE = (_slideMenu_ie6 || _slideMenu_ie7);

function slideMenu(id) {
    this.id = id;
    this.menu = document.getElementById(id);
    this.submenu = this.menu.getElementsByTagName("span");
    this.speed = 3;
    this.delay = 30;
    this.onloadFuns = window.onload;
}

slideMenu.prototype.init = function () {
    var pointer = this, a, c;

    for (var i = 0; i < this.submenu.length; i++) {
        eval('this.submenu[' + i + '].' + this.handler + '=function(){pointer.collapseOther(this.parentNode);pointer.slide(this.parentNode);}');
    }

    if (this.autoexpand) {
        window.onload = function () {
            if (pointer.onloadFuns != null && typeof pointer.onloadFuns == 'function') {
                pointer.onloadFuns();
            }
            pointer.highlight();
        }
    }
}

slideMenu.prototype.highlight = function () {
    var currentLink = (_slideMenu_isIE) ? window.location.toString().toLowerCase() : window.location.pathname.toString().toLowerCase();
    var alink = document.getElementById(this.id).getElementsByTagName('a');
    for (var i = 0; i < alink.length; i++) {
        var path = alink[i].getAttribute('href').toLowerCase();
        if (!/\//.test(path)) {
            var currentLink = currentLink.substring(currentLink.lastIndexOf('/') + 1, currentLink.length);
        }
        if (path == currentLink) {
            alink[i].className = this.currentStyle;
            alink[i].parentNode.className = this.currentStyle;
            this.expandMenu(alink[i].parentNode.parentNode);
            break;
        }
    }
}

slideMenu.prototype.slide = function (submenu) {
    var smenu = submenu.getElementsByTagName('ul')[0];
    if (typeof smenu == 'undefined') {
        this.collapseOther();
    } else {
        if (smenu.className == 'collapsed') {
            this.expandMenu(smenu);
        }
        if (smenu.className == 'expand') {
            this.collapseMenu(smenu);
        }
    }
}

slideMenu.prototype.expandMenu = function (submenu) {
    var cHeight = 0;
    var cHeight_pre = cHeight;
    var li = submenu.getElementsByTagName("li");
    for (var i = 0; i < li.length; i++) {
        cHeight += li[i].offsetHeight;
    }

    var slideBy = Math.round(this.speed * li.length);

    var pointer = this;
    var interval = setInterval(function () {
        var newHeight = submenu.offsetHeight + slideBy;
        if (newHeight < cHeight) {
            submenu.style.height = newHeight + 'px';
        } else {
            clearInterval(interval);
            submenu.style.height = cHeight + 'px';
            submenu.className = 'expand';
            pointer.collapseOther(submenu);
        }
    }, pointer.delay);
}


slideMenu.prototype.collapseMenu = function (submenu) {
    var cHeight = 0;
    var li = submenu.getElementsByTagName("li");


    var slideBy = Math.round(this.speed * li.length);
    var delay = Math.max(Math.round(this.delay / li.length), 1);

    var pointer = this;
    var interval = setInterval(function () {
        var newHeight = submenu.offsetHeight - slideBy;
        if (newHeight > cHeight) {
            submenu.style.height = newHeight + 'px';
        } else {
            clearInterval(interval);
            submenu.style.height = cHeight + 'px';
            submenu.className = 'collapsed';
        }
    }, delay);
}

slideMenu.prototype.collapseOther = function (submenu) {
    var smenu;
    for (var i = 0; i < this.submenu.length; i++) {
        smenu = this.submenu[i].parentNode.getElementsByTagName('ul')[0];
        if (typeof smenu != 'undefined') {
            if (smenu != submenu && smenu.className == 'expand') {
                this.collapseMenu(smenu);
            }
        }
    }
}


function expandCurrentLink() {
    var currentLink = (_slideMenu_isIE) ? window.location.toString().toLowerCase() : window.location.pathname.toString().toLowerCase();
    var alink = document.getElementById(_slideMenu_ID).getElementsByTagName('a');
    for (var i = 0; i < alink.length; i++) {
        if (alink[i].getAttribute('href').toLowerCase() == currentLink) {
            alink[i].parentNode.className = 'current';
            _slideMenu_ID.expandMenu(alink[i].parentNode.parentNode);
            break;
        }
    }
}

// JavaScript Document
function addEvent(obj, evType, fn) {
    if (obj.addEventListener) {
        obj.addEventListener(evType, fn, false);
        return true;
    } else if (obj.attachEvent) {
        var r = obj.attachEvent("on" + evType, fn);
        return r;
    } else {
        return false;
    }
}