A lot of old timers will tell you that this is impossible but there are programs that you can buy that will make it extremely hard for 99% of those who view your site. If you send me some code I can encrypt it for you so you could see an example. Send it via PM. However if you're looking for a free way to protect your site then that is much harder. It's also browser dependent so what works with one browser may or may not work with another. As far as I'm concerned, make it as hard as possible for as many as possible. Every little bit helps

Arn't you talking about something like Zend which will encrypt the php?

.......No.