How to make links that don`t change the URL in the navigator?

Hi. I`m making a JSP web page. How do I make that links don`t appear in the navigation bars (where URL`s are)?



I want to make something similar to the effect of POST in forms, that`s, changing the page without changing the URL. I know this is something related to a server side change, and not a client side redirect, but I don`t know how to do it.How to make links that don`t change the URL in the navigator?
Use FRAMES, and load the link into one of the FRAMES. The FRAMESET DOCUMENT (FRAME PARENT) will be the URL in the browser.