var siteMenu = Class.create();
	siteMenu.prototype =
	{
		initialize: function( menu_container_id, opener_class, opened_class, closed_class )
		{
			this.main_container = $(menu_container_id);
			if( !this.main_container )
			{
				return false;
			}
			this.class_opener = opener_class;
			this.class_opened = opened_class;
			this.class_closed = closed_class;
			this.last_target = false;
			this.submenus = new Array();

			this.elements = $A( this.main_container.getElementsByTagName('DIV') );
			for( i=0; i<this.elements.length; i++ )
			{
				if( this.elements[i].id && this.elements[i].className )
				{
					if( this.elements[i].id.indexOf('sub') != -1 )
					{
						this.submenus.push( this.elements[i].id );
					}
					else
					{
						Event.observe(
							this.elements[i],
							'click',
							this.toggleOpener.bindAsEventListener(this,this.elements[i] )
						);

						if( this.elements[i].className != this.class_opened )
						{
							this.toggleMenu( this.elements[i] );
						}
					}
				}
			}
			this.elements.clear();
			this.initialized = true;

			return true;
		},

		toggleMenu: function( opener )
		{
			this.container_id = 'sub'+opener.id
			if( this.initialized )
			{
				this.last_target = this.container_id;
				if( this.submenus.indexOf(this.last_target) == -1 )
				{
					this.last_target = false;
				}
			}
			else
			{
				if( !this.last_target || this.last_target.id != this.container_id )
				{
					this.last_target = $(this.container_id);
				}
			}
			if( this.last_target )
			{
				Element.toggleClassName(this.last_target,this.class_closed);
			}
			return true;
		},

		toggleOpener: function(e,opener)
		{
			elm = Event.element(e);
			if( elm.tagName == 'A' ) return true;

			this.toggleMenu(opener);
			opener.className = ( opener.className == this.class_opened ) ? this.class_opener : this.class_opened;
			return true;
		}
	}