A Query ON Training vector

Respected Sir, I have 2 queries on Training using ANN For face recognition:- 1. Say I have 2 classes each class is containing 3 images/person then my target vector should be:- 111000 000111 But if I choose my training images randomly, say i choose odd numbered images to be in my training set then what must be my target vector:- 1 2 3 4 5 6---- indexes 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 2) Say in case of a different problem, my test set contains 1/3rd of my training set and if i am choosing my test set randomly, then if i have to write the code for recognition, then should i have to set an index seperately, for each test image so that after simulating the network, i shall be able to match the indexes with the indices of the final recognized matrix? Thanks in advance.