var imageChanger = Class.create();
	imageChanger.prototype =
	{
		initialize: function(map_container_id, image_id, image_path, image_ext)
		{
			this.map_container = $(map_container_id);
			this._image = $(image_id);
			this.image_path = image_path;
			this.image_ext = image_ext;
			this.image = Array ();

			this.maps = $A( this.map_container.getElementsByTagName('MAP') );
			for( i=0; i<this.maps.length; i++)
			{
				this.image[i]= new Image();
				this.image[i].src= this.image_path + (i+1) +'.' + this.image_ext;

				this.elements = $A( this.maps[i].getElementsByTagName('AREA') );
				for( j=0; j<this.elements.length; j++ )
				{
					this.current_image  = this.elements[j].title;
					Event.observe(
									this.elements[j],
									'click',
									this.imgChange.bind(this, this.current_image)
								);
				}
			}
		},

		imgChange: function( current )
		{
			this._image.src= this.image_path + current + '.' +this.image_ext;
			this._image.useMap = "#" + "Map" + current;
			return false;
		}
	}