can someone tell me how to install AJAX for apache

I need help or a small tutorial on how to install ajax for php and apache to run some scripts i bought off here.

I did a search on go.com and could not find anything helpful.

in fact i am clueless to ajax. so please be detailed.

you won't find anything to install, because there is nothing :) AJAX is a technique that basically uses javascript to load certain pages (like php) from the server but doesn't need to refresh all the page (Wikipedia http://en.wikipedia.org/wiki/Ajax_%28programming%29)