/***********************************************  
* Slashdot Menu script- By DimX  
* Submitted to Dynamic Drive DHTML code library: http://www.dynamicdrive.com  
***********************************************/  
function SDMenu(id) {   
    if (!document.getElementById || !document.getElementsByTagName)   
        return false;   
    this.menu = document.getElementById(id);   
    this.submenus = this.menu.getElementsByTagName("div");   
    this.remember = true;   
    this.speed = 3;   
    this.markCurrent = false;   
    this.oneSmOnly = false;   
}   
SDMenu.prototype.init = function() {   
    var mainInstance = this;   
    for (var i = 0; i < this.submenus.length; i++)   
        this.submenus[i].getElementsByTagName("span")[0].onclick = function() {   
            mainInstance.toggleMenu(this.parentNode);   
        };   
    if (this.markCurrent) {   
        var links = this.menu.getElementsByTagName("a");   
        for (var i = 0; i < links.length; i++)   
            if (links[i].href == document.location.href) {   
                links[i].className = "current";   
                break;   
            }   
    }   
    if (this.remember) {   
        var regex = new RegExp("submenu_" + encodeURIComponent(this.menu.id) + "=([01]+)");   
        var match = regex.exec(document.cookie);   
        if (match) {   
            var states = match[1].split("");   
            for (var i = 0; i < states.length; i++)   
                this.submenus[i].className = (states[i] == 0 ? "collapsed" : "");   
        }   
    }   
};   
SDMenu.prototype.toggleMenu = function(submenu) {   
    if (submenu.className == "collapsed")   
        this.expandMenu(submenu);   
    else  
        this.collapseMenu(submenu);   
};   
SDMenu.prototype.expandMenu = function(submenu) {   
    var fullHeight = submenu.getElementsByTagName("span")[0].offsetHeight;   
    var links = submenu.getElementsByTagName("a");   
    for (var i = 0; i < links.length; i++)   
        fullHeight += links[i].offsetHeight;   
    var moveBy = Math.round(this.speed * links.length);   
       
    var mainInstance = this;   
    var intId = setInterval(function() {   
        var curHeight = submenu.offsetHeight;   
        var newHeight = curHeight + moveBy;   
        if (newHeight < fullHeight)   
            submenu.style.height = newHeight + "px";   
        else {   
            clearInterval(intId);   
            submenu.style.height = "";   
            submenu.className = "";   
            mainInstance.memorize();   
        }   
    }, 30);   
    this.collapseOthers(submenu);   
};   
SDMenu.prototype.collapseMenu = function(submenu) {   
    var minHeight = submenu.getElementsByTagName("span")[0].offsetHeight;   
    var moveBy = Math.round(this.speed * submenu.getElementsByTagName("a").length);   
    var mainInstance = this;   
    var intId = setInterval(function() {   
        var curHeight = submenu.offsetHeight;   
        var newHeight = curHeight - moveBy;   
        if (newHeight > minHeight)   
            submenu.style.height = newHeight + "px";   
        else {   
            clearInterval(intId);   
            submenu.style.height = "";   
            submenu.className = "collapsed";   
            mainInstance.memorize();   
        }   
    }, 30);   
};   
SDMenu.prototype.collapseOthers = function(submenu) {   
    if (this.oneSmOnly) {   
        for (var i = 0; i < this.submenus.length; i++)   
            if (this.submenus[i] != submenu && this.submenus[i].className != "collapsed")   
                this.collapseMenu(this.submenus[i]);   
    }   
};   
SDMenu.prototype.expandAll = function() {   
    var oldOneSmOnly = this.oneSmOnly;   
    this.oneSmOnly = false;   
    for (var i = 0; i < this.submenus.length; i++)   
        if (this.submenus[i].className == "collapsed")   
            this.expandMenu(this.submenus[i]);   
    this.oneSmOnly = oldOneSmOnly;   
};   
SDMenu.prototype.collapseAll = function() {   
    for (var i = 0; i < this.submenus.length; i++)   
        if (this.submenus[i].className != "collapsed")   
            this.collapseMenu(this.submenus[i]);   
};   
SDMenu.prototype.memorize = function() {   
    if (this.remember) {   
        var states = new Array();   
        for (var i = 0; i < this.submenus.length; i++)   
            states.push(this.submenus[i].className == "collapsed" ? 0 : 1);   
        var d = new Date();   
        d.setTime(d.getTime() + (30 * 24 * 60 * 60 * 1000));   
        document.cookie = "submenu_" + encodeURIComponent(this.menu.id) + "=" + states.join("") + "; expires=" + d.toGMTString() + "; path=/";   
    }   
};