function addEvent(el, evType, fn) {
	if (typeof(el)=='string') el=$(el);
	if (typeof(el)!='object') {alert('addEvent: object not found, el='+el); return;}
	if (el.addEventListener) { el.addEventListener(evType, fn, false); return true; 	}
	else if (el.attachEvent) { var r = el.attachEvent('on'+evType, fn); return r; }
	else { el['on'+evType] = fn; }
}

function vMnu(id) {
	if (!document.getElementById || !document.getElementsByTagName) return false;
	this.menu=document.getElementById(id);
	this.submenus=new Array();
	this.speed=4;
	this.markCurrent=false;
	this.onlyOne=true;
	this.remember=false;
}

vMnu.prototype.menuClick=function(event) {
	el=event.target || event.srcElement;
	el.blur();
	if (el.parentNode.parentNode.parentNode.tagName.toLowerCase()!='li') 
		el.parentNode.cls.toggleMenu(el.parentNode.getElementsByTagName("ul")[0]);
}
	
vMnu.prototype.init=function() {
	var mainInstance=this;
	
	for (var i=0; i<this.menu.childNodes.length; i++) {
		if (this.menu.childNodes[i].nodeType==1) {
			if (this.menu.childNodes[i].getElementsByTagName("ul").length) {
				var submenu=this.menu.childNodes[i].getElementsByTagName("ul")[0];
				this.submenus.push(submenu);
				this.menu.childNodes[i].cls=this;
				
				addEvent(this.menu.childNodes[i], 'click', this.menuClick);
				if (submenu.className!='expanded') submenu.style.display='none';
			}
		}
	}

	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='on';
				break;
			}
	}
	if (this.remember) {
		var regex=new RegExp("vmnu_"+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 (states[i]==0) {
					this.submenus[i].style.display='';
					this.submenus[i].className='expanded';
				}else this.submenus[i].className='';
				//this.submenus[i].className=(states[i]==0 ? 'expanded' : '');
			}
		}
	}
};

vMnu.prototype.toggleMenu=function(submenu) {
	if (submenu.className!='expanded') this.expand(submenu);
	else this.collapse(submenu);
};

vMnu.prototype.expand=function(submenu) {
	submenu.style.display='';
	submenu.style.height='1px';
	var fullHeight=0;
	for (var i=0; i<submenu.childNodes.length; i++) if (submenu.childNodes[i].nodeType==1) fullHeight+=submenu.childNodes[i].offsetHeight;
	var moveBy=Math.round(this.speed * submenu.childNodes.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='expanded';
			mainInstance.memorize();
		}
	}, 30);
	this.collapseOthers(submenu);
};

vMnu.prototype.collapse=function(submenu) {
	var moveBy=Math.round(this.speed * submenu.childNodes.length);
	var mainInstance=this;
	var intId=setInterval(function() {
		var curHeight=submenu.offsetHeight;
		var newHeight=curHeight - moveBy;
		if (newHeight>0) submenu.style.height=newHeight+'px';
		else {
			clearInterval(intId);
			submenu.style.display='none';
			submenu.style.height='1px';
			submenu.className='';
			mainInstance.memorize();
		}
	}, 30);
};

vMnu.prototype.collapseOthers=function(submenu) {
	if (this.onlyOne) for (var i=0; i<this.submenus.length; i++) if (this.submenus[i]!=submenu && this.submenus[i].className=='expanded') this.collapse(this.submenus[i]);
};

vMnu.prototype.expandAll=function() {
	var oldonlyOne=this.onlyOne;
	this.onlyOne=false;
	for (var i=0; i<this.submenus.length; i++) if (this.submenus[i].className!='expanded') this.expand(this.submenus[i]);
	this.onlyOne=oldonlyOne;
};

vMnu.prototype.collapseAll=function() {
	for (var i=0; i<this.submenus.length; i++) if (this.submenus[i].className=='expanded') this.collapse(this.submenus[i]);
};

vMnu.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=='expanded' ? 0 : 1);
		var d=new Date();
		d.setTime(d.getTime() + (30 * 24 * 60 * 60 * 1000));
		document.cookie="vmnu_"+ this.menu.id +"="+ states.join("") +"; expires="+ d.toGMTString() +"; path=/";
	}
};