thanx folks,
one more help, In my hostel I use a CDMS mobile to connect to internet, can i also connect to my LAN (at home) from there ?

and i forgot to mention I got 10/100 card on board ,so it think an additional hub will do the the work for me if I want to connect to 4-8 users or still u guys suggest me to go for a new lan card.

Truly i dont know any thing about networking.