Using an external search engine

This is very easy, but will only index public documents. Any search engine will work, but Google is a good choice. Google provide a site-search service which allows you to register with them and then have a form which searches your site using google and adds your logo and colourscheme to the results.

A really easy solution is to just make a form which links to our "google_site" script which just adds "site:yoursite.com" to the google request to limit the search results. The HTML for this would be something like:

 

Use Google to search this site:

For other search engines; see their documentation for how to make a form to search only your site.