How to embed search form into page and search that page's content?

I have a page built in Sharepoint. I need to create a little search box within that page so people can search for names on that same page. It’s a page with a lot of text, hence why the search feature is needed.

I can only use an XML editor.

Browsers have this ability already. It’s called “Find”.

I know, but the boss wants the search function:(

It would be a Javascript function, not a PHP page if you want to do it inside the same page. Flagging this for moving.