World of Warcraft CD-Keys!

Is there any way I can recieve another set of my account CD-keys? I lent my Burning Crusade disks, along with WOTLK to some careless friends(2 friends to be exact). Ofcourse after sometime, neather of them knows where my CD-keys are. I dont care much for the disks, since I can always download the client online, etc. But I like to keep my CD-keys around for security purposes. Is there some kind of procedure I follow to get another pair of the same CD-keys? Maybe an email I can contact?


Blue Reply would be highly appreciate! :D