function Menu(id) {
	if(!document.getElementById || !document.getElementsByTagName)
		return false;
	this.menu = document.getElementById(id);
	this.submenus = this.menu.getElementsByTagName("div");
	this.rememberMenu = true;
	this.speed = 3;
	this.selectCurrent = true;
	this.onlyOneOpen = true;
	this.HideField = id + "hid";
}
Menu.prototype.init = function() {
	var mainInstance = this;
	this.collapseAllFirst();
	for(var i = 0; i < this.submenus.length; i++)
		this.submenus[i].getElementsByTagName("span")[0].onclick = function()
		{
			mainInstance.toggleMenu(this.parentNode);
		};
	if(this.selectCurrent) {
		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.rememberMenu) {
		var regex = new RegExp("Menu_" + 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++)
			{
				if(this.submenus[i])
				{
					this.submenus[i].className = (states[i] == 0 ? "collapsed" : "");
					if(this.submenus[i].className == "")
						this.ExpandFast(this.submenus[i]);
				}
			}
		}
	}
};
Menu.prototype.toggleMenu = function(submenu) {
	if(submenu.className == "collapsed")
		this.expandMenu(submenu);
	else
		this.collapseMenu(submenu);
};
Menu.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);
};
Menu.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 = minHeight + "px";
			submenu.className = "collapsed";
			mainInstance.memorize();
		}
	}, 30);
};
 Menu.prototype.collapseFast = function(submenu) {
	submenu.style.height = submenu.getElementsByTagName("span")[0].offsetHeight + 'px';
	submenu.className = "collapsed";
};
 Menu.prototype.ExpandFast = function(submenu) {
	var fullHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
	submenu.style.height = "";
};
 Menu.prototype.collapseOthers = function(submenu) {
	if(this.onlyOneOpen) {
		for(var i = 0; i < this.submenus.length; i++)
			if(this.submenus[i] != submenu && this.submenus[i].className != "collapsed" && submenu.parentNode.innerHTML != this.submenus[i].innerHTML)
				this.collapseMenu(this.submenus[i]);
	}
};
 Menu.prototype.expandAll = function() {
	var oldonlyOneOpen = this.onlyOneOpen;
	this.onlyOneOpen = false;
	for(var i = 0; i < this.submenus.length; i++)
		if(this.submenus[i])
			if(this.submenus[i].className == "collapsed")
				this.expandMenu(this.submenus[i]);
	this.onlyOneOpen = oldonlyOneOpen;
};
 Menu.prototype.collapseAll = function() {
	for(var i = 0; i < this.submenus.length; i++)
		if(this.submenus[i])
			if(this.submenus[i].className != "collapsed")
				this.collapseFast(this.submenus[i]);
};
 Menu.prototype.collapseAllFirst = function() {
	for(var i = 0; i < this.submenus.length; i++)
		if(this.submenus[i])
			this.collapseFast(this.submenus[i]);
};
 Menu.prototype.memorize = function() {
	if(this.rememberMenu) {
		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() + (60000));
		document.cookie = "Menu_" + encodeURIComponent(this.menu.id) + "=" + states.join("") + "; path=/";
	}
};