115252 search engine

i need a google-liked search engine, not to index the world wide web, only all sites within a state/country. (making that a specialized search engine) must be fast yet can produce high results relevancy ([login to view URL] is a good example) i must be able to add the sites i want to be indexed through the admin panel. some of its features are: - it can index unlimited webpages and websites - once indexed, the spider will frequently visit the specific website so to fetch the latest updated results - visitors can submit their own website to be indexed (subjected to my approval) - it will spider the exact domain I added (i.e. if I add [login to view URL] it wont go and index the whole [login to view URL], only all pages under [login to view URL]) - highlighted or bold keywords searched on results pages - ability to add/edit/delete websites from the database - can index both static and dynamic pages, pdf and doc files [login to view URL] is a good script i found but it will greatly slowed down if i'm to add more than 50 sites (i may need to index thousands or even millions of pages)