Simple Ajax using Prototype. Part 2

Ajax Updater - Update a DOM element ID from a Server Script

This example is probably the simplest example you will ever find.
We are going to use the prototype feature ‘ajax.Updater’ (see part one for more details on prototype).

ajax.Updater allows you to specify an element ID and script URL - and whatever the script URL prints will appear in your element ID. Simple as that.

The example below simply returns the Server time each time the button is clicked.

I’m not going to explain this bit by bit as it is just so easy to grasp.

Remember, you will need the prototype library in order to use this!

Readmore......

From : http://www.ajaxtutorial.net/index.php/2006/11/30/simple-ajax-using-prototype-part-2/