This is JavaScript that highlights search terms the same way the Google cached pages do. It's purely client-side; you don't have to install anything on the Web server. It also allows readers to turn off the highlighting or hide the legend at the top of the page.
Commercial Use
Modify
Distribute
Place Warranty
Sub-License
Private Use
Use Patent Claims
Hold Liable
Use Trademarks
Include Copyright
State Changes
Include License
Include Notice
These details are provided for information only. No information here is legal advice and should not be used as such.