Hello ,
I have a computer that is connected to the internet via network card . I want to connect my friend's laptop to the internet . but it doesn't a network card . can I do this with usb cable or ...

We just covered this post about connecting a laptop without a network card to a network, it has most (if not all) the info you'd need.

http://www.daniweb.com/forums/post637159.html#post637159

The short of it is that the easiest way is to pick up a network adapter (Cardbus or USB) you can get them off ebay for a few $$$ and install without any serious tech experience.

Failing that you can use specialized USB cables (kind of hard to find and more expensive than a networking adapter) firewire (probably not on a laptop that doesn't have ethernet) or a serial "null modem connection" to another computer that is connected to the network.

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