if (top == 1)
{
    y = global.idealborder[2] - sprite_height;
    vspeed = 2;
    alarm[4] = 20;
}
if (top == 0)
{
    y = global.idealborder[3];
    sprite_index = spr_amalgam_toothd;
    mask_index = spr_amalgam_toothmask_d;
    vspeed = -2;
    alarm[4] = 20;
}
visible = true;