I have one adsense account and I am using it in one website and one blog which is related to that site. Those two sites are the property of two of us, me and one of my freinds. The earning from those two sites should go to both of us.
Now I am planning to launch another blog, which would be my personal area and I intend to use the same adsense account there as getting a new adsense account is now very difficult.

Is there any option to know which earning (rather clicks) generates in which website/blog! Could any one of you help me to sort it out?