struct AnimBgInfo
{
    u8 count;                        // amount of battlers on bg
    u8 battlers[MAX_BATTLERS_COUNT]; // array of battlers on bg
};

static void TryPutBattlerOnBg(u32 battler)
{
    u32 i;
    u32 x, x2;
    struct AnimBgInfo *bgInfo;

    x = GetBattlerSpriteCoord(battler, BATTLER_COORD_X_2);

    // try put battler on bg1
    bgInfo = &sAnimBg1Info;
    for (i = 0; i < bgInfo->count; i++)
    {
        x2 = GetBattlerSpriteCoord(bgInfo->battlers[i], BATTLER_COORD_X_2);
        // do these sprites intersect?
        if ((x < x2 && x + 64 >= x2) || (x > x2 && x <= x2 + 64))
            break;
    }
    if (i == bgInfo->count)
    {
        bgInfo->battlers[bgInfo->count++] = battler;
        MoveBattlerSpriteToBG(battler, FALSE);
    }
    else
    {
        // try put battler on bg2
        bgInfo = &sAnimBg2Info;
        for (i = 0; i < bgInfo->count; i++)
        {
            x2 = GetBattlerSpriteCoord(bgInfo->battlers[i], BATTLER_COORD_X_2);
            if ((x < x2 && x + 64 >= x2) || (x > x2 && x <= x2 + 64))
                break;
        }
        if (i == bgInfo->count)
        {
            bgInfo->battlers[bgInfo->count+] = battler;
            MoveBattlerSpriteToBG(battler, TRUE);
        }
    }
}