Javascript Keywords

I am looking for someoen to create me a script that I can use on my site. I have made a new template and want to implament a javascript type keyword matcher. I have seen it on Yahoo before. What it does is if there is a link that matchs a keyword for a site. It will highlight it and have a drop down beside the word providing the links/information that is related to this word. I want it to be able to find keywords that are relate to my links with in my site. Like if it says camouflage in a paragraph and I have a page that talks or is about camouflage. I would like it to highlight and provide the link and information. Then if they want they can click it. I need to kind of easy to add to new pages. As I want to be able to do this for all new pages I make for my site.