function ease_inout_back(arg0, arg1, arg2, arg3)
{
    var _s = 1.70158;
    arg0 /= arg3;
    arg0 *= 2;
    if (arg0 < 1)
    {
        _s *= 1.525;
        return (arg2 * 0.5 * (arg0 * arg0 * (((_s + 1) * arg0) - _s))) + arg1;
    }
    arg0 -= 2;
    _s *= 1.525;
    return (arg2 * 0.5 * ((arg0 * arg0 * (((_s + 1) * arg0) + _s)) + 2)) + arg1;
}