var navigatorTabs = Class.create();
	navigatorTabs.prototype =
	{
		initialize: function( toggler_container_id, toggler_class, toggler_over_class, block_container_id, block_container_class, block_class, hidden_class )
		{
			this.toggler_container = $(toggler_container_id);
			this.togglers = this.toggler_container.getElementsByClassName(toggler_class);

			this.container = $(block_container_id);
			this.blocks = this.container.getElementsByClassName(block_class);

			if( this.togglers.length != this.blocks.length )
			{
				return false;
			}

			this.toggler_over_class = toggler_over_class;
			this.hidden_class = hidden_class;

			this.container.addClassName( block_container_class);
			this.container.addClassName( this.hidden_class );

			this.blocks[0].addClassName( this.hidden_class );
			this.blocks[1].addClassName( this.hidden_class );

			this.observeToggler(this.togglers[0], this.blocks[1], this.blocks[0] );
			this.observeToggler(this.togglers[1], this.blocks[0], this.blocks[1]);

			return true;
		},

		observeToggler: function(toggler_obj, block_to_hide, block_to_show )
		{
			Event.observe
			(
				toggler_obj,
				'click',
				this.switchBlocks.bind(this, block_to_hide, block_to_show )
			);

			Event.observe
			(
				toggler_obj,
				'mouseover',
				this.toggleClass.bind( this, toggler_obj )
			);

			Event.observe
			(
				toggler_obj,
				'mouseout',
				this.toggleClass.bind( this, toggler_obj )
			);

			return true;
		},

		toggleClass: function( toggler_obj )
		{
			if( toggler_obj.hasClassName(this.toggler_over_class) )
			{
				toggler_obj.removeClassName(this.toggler_over_class);
			}
			else
			{
				toggler_obj.addClassName(this.toggler_over_class);
			}
			return true;
		},

		switchBlocks: function( block_to_hide, block_to_show )
		{
			if( !block_to_hide.hasClassName(this.hidden_class) )
			{
				block_to_hide.addClassName(this.hidden_class);
			}

			if( block_to_show.hasClassName(this.hidden_class) )
			{
				block_to_show.removeClassName(this.hidden_class);
				this.container.removeClassName(this.hidden_class);
			}
			else
			{
				this.container.addClassName(this.hidden_class);
				block_to_show.addClassName(this.hidden_class);
			}

			return true;
		}
	};