package  {
	import flash.display.MovieClip;
	import flash.events.*;
	import flash.ui.Keyboard;

	public class robot extends MovieClip {
		private var _root: Object;
		private var speed: int = 5;

		public function robot() {
			// constructor code
			addEventListener(Event.ADDED, beginClass);
		}

		private function beginClass(e: Event): void {
			_root = MovieClip(root);
			stage.addEventListener(KeyboardEvent.KEY_DOWN, moveRobot);
		}

		private function moveRobot (e: KeyboardEvent): void {
			if (e.keyCode == Keyboard.UP) {
				y -= speed;
			}

			if (e.keyCode == Keyboard.DOWN) {
				y += speed;
			}

				//code to stop going off screen
			if ((this.y - (this.height / 2)) < 0) {
				y = (0 + this.height / 2);
			}

			if ((this.y + (this.height / 2)) > 400) {
				y = (400 - this.height / 2);
			}
		}
	}
}