change text without reloading

I'm new to javascript and I was wondering if anyone could help me? I'm creating a page that has some html that I want to change using links on the same page, but no pages are reloaded. May?

There are various ways. You can hide alternate text(s) and show them selectively, or you can import other text(s).

Look at some of these:

http://www.dynamicdrive.com/dynamicindex17/indexb.html

and these:

http://www.dynamicdrive.com/dynamicindex17/index.html