// ASSUMES the layer1 pointer has already been copied to this stage
function moveAllSublevels(stage, rom)
{
    var sublevels = stage.copyfrom.sublevels.slice(0);
    sublevels[0] = stage.id;

    var remap = {}; remap[stage.copyfrom.id] = stage.id;
    for (var i = 1; i < sublevels.length; ++i)
    {
        var id = sublevels[i];
        if ((id & 0x100) !== (stage.id & 0x100))
        {
            var newid = remap[id] = findOpenSublevel(stage.id & 0x100, rom);
            moveSublevel(id, newid, rom);
        }
    }

    // fix all screen exits
    for (var i = 0; i < sublevels.length; ++i)
    {
        var id = sublevels[i], exits = getScreenExits(id, rom);
        for (var j = 0; j < exits.length; ++j)
        {
            var x = exits[j], target = getSublevelFromExit(x);
            if (target in remap)
            {
                var newtarget = remap[target];
                if (!x.issecx) rom[x.addr+3] = newtarget;
                else
                {
                    var secid = x.target;
                    var newsecid = findOpenSecondaryExit(stage.id & 0x100, rom);
                    rom[x.addr+3] = newsecid & 0xFF;

                    // copy all secondary exit tables
                    rom[SEC_EXIT_OFFSET_LO + newsecid] = rom[SEC_EXIT_OFFSET_LO + secid];
                    rom[SEC_EXIT_OFFSET_HI + newsecid] = rom[SEC_EXIT_OFFSET_HI + secid];
                    rom[SEC_EXIT_OFFSET_X1 + newsecid] = rom[SEC_EXIT_OFFSET_X1 + secid];
                    rom[SEC_EXIT_OFFSET_X2 + newsecid] = rom[SEC_EXIT_OFFSET_X2 + secid];

                    // fix secondary exit target
                    rom[SEC_EXIT_OFFSET_LO + newsecid]  = newtarget & 0xFF;
                    rom[SEC_EXIT_OFFSET_HI + newsecid] &= 0xF7;
                    rom[SEC_EXIT_OFFSET_HI + newsecid] |= (newtarget & 0x100) >> 5;

                    // clear old secondary exit target
                    rom[SEC_EXIT_OFFSET_LO + secid]  = 0x00;
                    rom[SEC_EXIT_OFFSET_HI + secid] &= 0xF7;
                }
            }
        }
    }
}