i was wondering on how do i change my cd key's with out using the disk's bc i just got another comp and i just copyied the file on to the other comp but i need to change the cd keys and in the new file

You can only buy a new set of cd keys straight from Blizzard.

i already have new cd's i just need to change em lol on the new file

There is no way (that follows the rules) to change your cd keys without reinstalling.

You would need to completely re-install because just changing them would require the use of 3rd party programs, which is not allowed to be discussed here.