avoba

I ve been trying to acess some websites at work, but they are blocked via proxy, wich means, the only way you can access the internet is if you type a certain proxy (172.16.0.1, port 8080), at the control panel of your browser. I can only use the internet browser. If I try to change the proxy, to enter the blocked websites, the internet doesnt work, so my question is, Is there a possibility to unblock the websites without changing the proxy configuration? Thanks, avoba