whats the call?

[wilkey1979]

i reffed a game today and i would like some input on the call i made. A1 and B1 are battling for the ball by the oob's line A1 is fixing to grab the ball but B1 pushes A1 to get to the ball as he goes out of bounds. i immediately blow my whistle and call a foul on B1 because he pushed A1 before going out of bounds. the crowd came unglued and hollored that he was going for the ball and no contact was made. I felt like i made the right call. I want to know if i was right, and if not what could i have done different. Your advice please.