Ball jump under wall continuesly

1

This is my AS3.0 code. here ball bounce successfully jump. when i am trying to hit with on the wall… first time ball touch the wall and get back. again it works three times only…
but, after it will come out on the above wall and jumping process is starting…

Need::i want to jump the ball constant speed/place and and under the wall…

check my code and help me any one…
Email: vhkrishnan.v@gmail.com

import flash.display.MovieClip;
import flash.events.Event;

var speed:Number = 1;
var friction:Number = 0.98675;
var radious:Number = ball_mc.height/2;
var gravity:Number = 1; //a number so we can pull our ball downward every frame

addEventListener(Event.ENTER_FRAME, loop_func);
stage.addEventListener(KeyboardEvent.KEY_DOWN, keydown);

function loop_func(e:Event)
{

speed +=gravity;
trace("speed = "+speed)
speed *=friction;

var speed1:Number;
speed1 = speed;
trace("speed * friction = "+speed)
ball_mc.y +=speed;
trace("ball_mc.y = "+ball_mc.y)

if(ball_mc.y + radious > stage.stageHeight)
{
ball_mc.y -=2;
speed *=-1;
trace("ball speed = "+speed)
}
else
{
trace("else ")
ball_mc.y -=2;
}

if(container.hitTestPoint(ball_mc.x,ball_mc.y-radious,true)||
container.hitTestPoint(ball_mc.x,ball_mc.y+radious,true))
{
ball_mc.y += 1;
speed *= -1;
trace("hit test if ")

}
else if(container.hitTestPoint(ball_mc.x-radious,ball_mc.y,true))
{
    ball_mc.x += 2;
    trace("hit test else if")
    
}
else if(container.hitTestPoint(ball_mc.x+radious,ball_mc.y,true))
{
    ball_mc.x -=  2;
    trace("hit test else if second")
    
}

}
function keydown(e:KeyboardEvent):void
{
switch (e.keyCode)
{
case Keyboard.LEFT :
if(ball_mc.x >0)
{
ball_mc.x -=5
}
break;
case Keyboard.RIGHT :
if(ball_mc.x < stage.stageWidth - ball_mc.width)
{
ball_mc.x +=5
}
break;

}

}