So Im trying to learn platform GAMING for fun, cs5 flash AS.3

Followed TUT. Was at it for hours, quit came back next day realized i had missed alot of the tut instructions, can't understand how I could miss it even after reviewing the video 4-6 times. ANYWAY its a simple tutorial but im a simpler man. The ball is supposed to fall on the floor but It doesn't. Its probably something awkwardly simply but I've just started. Also I think I've copied on everything, but I taught so yesterday too...

TUTORIAL LINK: Part1: http://www.youtube.com/watch?v=Z160NtbM6Zs
Part2: http://www.youtube.com/watch?v=LVaEZMiiz7A

My fla. file: http://www.mediafire.com/?hm2q3k2gcdbsmm0
My Code:
Code: [Select]import flash.events.KeyboardEvent;
import flash.events.Event;

var KeyThatIsPressed:uint;
var rightKeyIsDown: Boolean= false;
var leftKeyIsDown: Boolean= false;
var upKeyIsDown: Boolean= false;
var downKeyIsDown: Boolean= false;

var gravity: Number = 1;
var yVelocity: Number = 0;
var canJump: Boolean= false;

stage.addEventListener(KeyboardEvent.KEY_DOWN, PressAKey);
stage.addEventListener(KeyboardEvent.KEY_UP, ReleaseAKey);

function PressAKey(event:KeyboardEvent):void
{
if(event.keyCode == Keyboard.RIGHT)
{
rightKeyIsDown = true;
}
if(event.keyCode == Keyboard.LEFT)
{
leftKeyIsDown = true;
}
if(event.keyCode == Keyboard.UP)
{
upKeyIsDown = true;
}
if(event.keyCode == Keyboard.DOWN)
{
downKeyIsDown = true;
}
}

function ReleaseAKey(event:KeyboardEvent):void
{
if(event.keyCode == Keyboard.RIGHT)
{
rightKeyIsDown = false;
}
if(event.keyCode == Keyboard.LEFT)
{
leftKeyIsDown = false;
}
if(event.keyCode == Keyboard.UP)
{
upKeyIsDown = false;
}
if(event.keyCode == Keyboard.DOWN)
{
downKeyIsDown = false;
}
}

circle_mc.addEventListener(Event.ENTER_FRAME, moveTheCircle);

function moveTheCircle(event:Event):void
{
if(rightKeyIsDown)
{
circle_mc.x +=5;
}
if(leftKeyIsDown)
{
circle_mc.x -=5;
}
if(upKeyIsDown && canJump)
{
yVelocity = -15;
canJump = false;
}
yVelocity+  gravity;

if(! floor_mc.hitTestPoint(circle_mc.x, circle_mc.y, true))
{
circle_mc.y +  yVelocity;
}
if(yVelocity > 20)
{
yVelocity = 20;
}

for(var i:int = 0; i<10; i++)
{
if(floor_mc.hitTestPoint(circle_mc.x, circle_mc.y, true))
{
circle_mc.y --;
yVelocity = 0;
canJump = true;
}
}
}
Sorry if wrong section