My client would like us to improve the basic homegrown search facility we set up on their website.

I thought about using Google Site Search but for reasons of their own they block most of the www web from their office systems and are not happy to whitelist Google. And they will probably feel the same way about Yahoo.

Is their an alternative Google Site Search from a lower profile provider?

I'm not much of a php programmer so it has to be both good and pretty straightforward to set up. (I can deal with Google Site Search fairly happily.)

Best Regards