Bow and Arrow-BalloonPop

programming flash
1

i have created a movie clip which are composed of balloon, archer,bow and arrow.

but the main problem is when i clicked the mouse the arrow start to shows up but it does not move vertically, in short it does not shoot upward.


package
{
	import flash.events.*;
	import flash.display.MovieClip;
	import flash.ui.Keyboard;
	
	public class archer extends MovieClip{
		public var rightArrow:Boolean = false;
		public var leftArrow:Boolean = false;
		public var arr:MovieClip = new arrows();
		public function archer():void{
			
			
			this.gotoAndStop('still');
			stage.addEventListener(KeyboardEvent.KEY_DOWN, keyPressed);
            stage.addEventListener(KeyboardEvent.KEY_UP, keyReleased);
            stage.addEventListener(MouseEvent.CLICK, onClick);
			addEventListener(Event.ENTER_FRAME, Walk);
        }
		
		function onClick (event:MouseEvent)
		{
			addChild(arr);
		}

        function keyPressed(event:KeyboardEvent) 
		{
            if (event.keyCode==Keyboard.RIGHT) 
			{
				this.gotoAndStop('walking');
                rightArrow=true;
            }
			else if (event.keyCode==Keyboard.LEFT)
			{
				this.gotoAndStop('walking');
				leftArrow=true;
			}

        }
        
        function keyReleased(event:KeyboardEvent) 
		{
            if (event.keyCode==Keyboard.RIGHT) 
			{
				this.gotoAndStop('still');
                rightArrow=false;
            }
			else if (event.keyCode==Keyboard.LEFT)
			{
				this.gotoAndStop('still');
				leftArrow=false;
			}

        }
		
        public function Walk(event:Event):void 
		{
            if (rightArrow == true)
			{
                this.x+=10;
            }
			if (leftArrow == true)
			{
				this.x-=10;
			}
        }
    }
}

here is my code, i need your help please, i need to pass it on tuesday.