Synchronize the time of my network

I have a network of 200 nt workstation and i have synchronize the time of my network with Net Time in the registry and i have put the client program in the logon script(logon.bat).Each time we connect the logon.bat ask a question wether we want to synchronize the local computer (y/n).
That’s the question i don’t want my users to answer. I want this answer to be respond automatically.