I previously mentioned I am enabling highlighting of search terms on some of my pages, the solution I used there was Google specific. Dave Lemen left a comment on that entry about a javascript he wrote but this one supports multiple search engines and not just Google.
His code can be found here and it is rather nifty. It provides a little legend on top of the page showing what is going on and allowing the user to turn the highlighting on and off on the fly.
NOTE: This is a static archive of an old blog, no interactions like search or categories are current.
