Thnaks nebulus200.
Just one thing more, so as I realized, you mean that even I use a proxy server my ISP would be able to know which URLs I've visited, right? Ok, I have searched something about "URL encryption" which is a service that some proxy servers offer ( specially cgi proxies ). and is like this: guess you want to go to www.somewhere.com and by using that proxy ( eg. www.proxy.com ) the address will looks like :
http://www.proxy.com/ KLJ987Hkjh79kjjKJGAWEMXvfD437

My reason of using such a service is that , as you might noticed when you submit your yahoo id and password in yahoo's mail page and hitting enter, you can see your yahoo id and password ( encrypted ) in your browser address field , but I do not like my ISP logging/seeing it. So is this kind of encryption helpfull?
Thanks for help

Cheers