>> i am running a wireless network and some1 accross the road can see our
>> network. is it possible to block them.

>There is no way you can prevent someone just seeing your wireless
>network; that is how wireless works. You can turn off SSID
>broadcasting, but this is not advantageous for your own network and
>really provides no security. You should make sure you have enabled
>encryption on your network, and you may also choose to do MAC address
>filtering on your router, only allowing your own computers to access
>the network. Then, although your network will be visible to outsiders,
>they will not be able to connect. Here is a link regarding basic
>wireless security:
>
>Wireless - Basic Security -  http://www.ezlan.net/Wireless_Security.html