Hunterxp773

Back into D2 but no CD key?
This being my first post and all, let me start out by introducing myself.
I have been playing Diablo since D1 when my cousin introduced it to me. I then followed up with D2...then LOD naturally. I stopped playing a few years back and got into WoW and other MMOs but, like many of yall out there, I have been inspired to start again with the confirmed development of D3.
Here is my problem, I have my original discs that I used in my Diablo adventures of past years but my 9 year old brother discovered the game about a year ago and has since lost the CD keys, which I had written on a post-it note in the CD case. I have gotten a necessary key from a friend to install the game but as most of yall know this will not allow me to play Battle.net which I long to do..
So long story short, my question here is what can be done in-order for me to be able to gain access to Battle.net, I have read about a program that generates a false key for you but I am not certain.
Thanks for the help,
Manifested