var siteMenu = Class.create();
	siteMenu.prototype =
	{
		initialize: function( menu_container_id, opener_class, opened_class, closed_class, top_line, bottom_line )
		{
			this.main_container = $(menu_container_id);
			this.top_line = $(top_line);
			this.bottom_line = $(bottom_line);

			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.position = '';
			this.submenus = new Array();
			this.elements_for_event = 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
					{
						if( this.elements[i].id != 'top_line' && this.elements[i].id != 'bottom_line' )
							this.elements_for_event.push(this.elements[i]);
					}
				}
			}

			for( i=0; i<this.elements_for_event.length; i++ )
			{
				if( this.elements_for_event[i].className != this.class_opened )
				{
					this.toggleMenu( this.elements_for_event[i] );
				}

				if( i == 0 )
				{
					if( this.elements_for_event[i].className == this.class_opened )
						this.top_line.className = '';
					this.position = 'first' ;
				}
				else if( i == (this.elements_for_event.length-1) )
				{
					if( this.elements_for_event[i].className == this.class_opened )
						this.bottom_line.className = '';
					this.position = 'last' ;
				}
				else
					this.position = '';

				Event.observe( this.elements_for_event[i], 'click', this.toggleOpener.bind( this, this.elements_for_event[i], this.position ) );
			}
			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( opener, position )
		{
			if( position == 'first' )
				this.top_line.className = ( this.top_line.hasClassName('hide') ) ? '' : 'hide';
			if( position == 'last' )
				this.bottom_line.className = ( this.bottom_line.hasClassName('hide') ) ? '' : 'hide';
			this.toggleMenu(opener);
			opener.className = ( opener.className == this.class_opened ) ? this.class_opener : this.class_opened;
			return true;
		}
	}