siner += 1;
if (siner <= 30)
{
    offx += (2 - (siner / 15));
    if (image_alpha < 1)
        image_alpha += 0.05;
}
if (siner >= 120)
{
    offx += (-8 + (siner / 15));
    image_alpha -= (1/30);
    if (image_alpha <= 0)
        instance_destroy();
}