Please any body tell me the books from where I can expert in Flash action script.
I usually buy flash books from either of these companies
Books are a great start, but becoming an expert in ActionScript is by no means something you can get just from books. You need to write lots of code, practise and develop your understanding. It will take time - in my case, it took me about six months to really start to understand the original ActionScript, and AS3 has so far taken me about the same to get an “okay” level of understanding - though of course, your mileage may vary 
