If a visitor comes to your site from a search engine such as Google or Yahoo, this function will highlight the keywords in a given text the user used for his search.

This class can be used to retrieve the search words entered by an user in a search engine site that lead the user to the current page.

The class can parse the HTTP_REFERER variable if present. Then it can detect which search engine site lead the user to the current page, and extract the search words.

Currently the following engines are supported:

- Google
- Yahoo
- MSN
- AllTheWeb
- LookSmart
- AskJeeves