Search Engine code

Hi PHPers, I have a client who is hosted with a service that provides PHP and MySQL, a simple counter cgi and a form-to-mail cgi. The client would like to implement a search engine to search just within their own site (html and php pages). Are there any search engines already developed out there that can be freely (or perhaps cheaply) used? I've searched on the php site, zend, phpbuilder, weberdev, but have not found anything substantial. Any help, pointers, urls greatly appreciated! --Doug _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com