vx = vy = 0;
fric = .85;
gravity = .3;
speed = 1;
w = _width/2;
h = _height;

function onEnterFrame() {
    vx *= fric;
    vy += gravity;
    _x += vx;
    _y += vy;

    if (Key.isDown(Key.LEFT)) {
        vx -= speed;
    }
    if (Key.isDown(Key.RIGHT)) {
        vx += speed;
    }

    grounded = false;
    while (vy >= 0 && (_root.flats.hitTest(_x-w, _y, true) || _root.flats.hitTest(_x+w, _y, true))) {
        _y -= gravity;
        vy = 0;
        grounded = true;
    }

    while (_root.flats.hitTest(_x-w+vx, _y-5, true)) {
        _x += vx+speed;
        vx = 0;
    }
    while (_root.flats.hitTest(_x+w+vx, _y-5, true)) {
        _x += vx-speed;
        vx = 0;
    }

    if (!Key.isDown(Key.UP)) {
        keyLock = false;
    }
    if (Key.isDown(Key.UP) && grounded && !keyLock) {
        vy = -5;
        keyLock = true;
    }
}