An AJAX request might fit the OP's requirements, but given how he does not seem to know much of the subject (HTTP, CGI), adding javascript and the DOM to the soup will make the code quite a bit more complex while giving very little benefit. (Slightly smoother page update, and that's it.)

(Not to mention that for an unfortunately large group of web developers, JS is the hammer they have and everything starts looking like a nail -- it is rife for abuse.)