I have an sony ericsson w700i,i want to connent to internet in my laptop by use of my phone(by bluetooth) i have no cable,i want to use bluetooth,how can i do this?

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You have a Sony Ericsson W700i which has a Java Operating System. Maybe - and I do mean maybe - you can tether your PC to the Internet with your phone IF your phone is supported by the Sony Ericsson PC Suite.

I say maybe, because I have never used a w700i with this PC Suite before.

You can download the PC Suite here and install it on your PC.:
http://www.softpedia.com/get/Mobile-Phone-Tools/Sony-Ericsson/Sony-Ericsson-PC-Suite.shtml

If your phone is supported by the PC Suite, you can look under the TOOLS section of the PC Suite and click on Internet Connection. (If it works, let me know.)

Also, if you can tether, and you use Bluetooth - your Internet connection will be slower than if you use a USB cable.