What you are asking is unfeasible, due to the client server protocol in web interface. For the browser to display the page, the server must send it in readable mode, anyway in a format understandable for a browser.

Everything the web server sends in such format can be read by any program that knows what to expect from a server. You can fool a dumb browser, but nothing can prevent somebody with Perl and LWP from seeing what the server is sending.

See also html tag encryptor/decryptor for a discussion on the same subject.