d = function( receiver, pos ){
				this.receiver = receiver;
				this.pos = pos;
			};
			MoveCommand.prototype.execute = function(){
				this.receiver.start( 'left', this.pos, 1000, 'strongEaseOut' );
			};
			var moveCommand;
			moveBtn.onclick = function(){
				var animate = new Animate( ball );
				moveCommand = new MoveCommand( animate, pos.value );
				moveCommand.execute();
			};
		</script>

		<script>
			var ball = document.getElementById( 'ball' );
			var pos = document.getElement