Well, if you want to use your own database with your own content you should search for it on sites like ajaxrain.com, hotscripts.com, roscripts.com etc. If you want to use the database of search engines like Google, Yahoo! you should use Google API which you can get access to via codes.google.com or for Yahoo! the SiteExplorer at siteexplorer.search.yahoo.com where you can add your website and let Yahoo! Search look for contents on your website which users can search in.
But for further assistance, you should get professional help, buy a package or search for great scripts on the web.
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