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 = true;
        this.oneSmOnly = true;

}
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("sdmenu_" + encodeURIComponent(this.menu.id) + "=([01]+)");
                //var match = regex.exec(document.cookie); //alert(match)
//                this.submenus[0].className="";
                /*if (match) {
                        var states = match[1].split(""); alert()
                        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 = "sdmenu_" + encodeURIComponent(this.menu.id) + "=" + states.join("") + "; expires=" + d.toGMTString() + "; path=/";
        }
};