I have nine computers in my office and i want to share the internet connection with all of them which is initially with the server. can you suggest me the modem for this purpose?
I would buy a hub, then connect all your computers to the hub and run one connection to your router. This is easiest way to do what you want and then all you have to do is have one internet connection.
Just buy a decent wireless router eg. Belkin, add a WEP key to it, enter it in all computers click remember this WEP key on all computers.Then you will be able to constantly go on the internet on all computers without any hassle.