NEED HELP URGENT WITH DIABLO 2 LoD !!!!!

[LhoJu]

Here's the problem:
I've made a backup copy of my original Diablo 2 Lod Expansion when I bought it. But now, the original cd broked and I only have left the backup cd. But I can't play with the backup cd without a crack(no cd fix, whatever), but when I crack the game, I can no longer use my original serial number to play battle net, witch is a real crap, because without the original serial number I can't ever connect to B net.

Does someone knows how to get over this problem ?????

Thanks for you support.