[AJAX] fonctionne pas chez moi...

AJAX est un terme qui regroupe un ensemble de technologies. Il faudrait nous dire ce que tu essayes de faire exactement. Mais si tu veux une introduction à AJAX, je te propose de regarder les liens sur ce site:
cestadire.ch

A new AJAX IDE and ADL(Ajax Dev Library)-- JoyiStar AJAX WebShop 3 Beta

Main Features: 1, efficient developing tool The JoyiStar WebShop is a

visualized modeling IDE (Integrated Development Environment). It follows

the OOP methodology and is constructed by many components which are

useful to accelerate application development process. In other words, it

helps to produce mature and complicate Rich Web applications at certain

high level. 2, AJAX development tools The JoyiStar WebShop is an AJAX

development tools to develop business-critical web applications and it

offers optimizing power of AJAX technology. 3, Encapsulated Web

Components - avoid your pain The JoyiStar WebShop provides many web

components to attain powerful functions such as dynamically generate

master-details, user interfaces, web report etc. 4,Support source

insight... 5, Simple, Secure, Standards based Pull-drag developing -

program in the mode of your choice. Cross-Platform - support all major

browsers at present. Integration - integrates with existing server-side

codes and services.

Free for personal version--JoyiStar AJAX WebShop 3 beta
already released and provide free download.
Downloading page link is: Free [url=http://www.joyistar.com][u]Downloads[/u] [/url]

Un exemple d'utilisation par ici :
php javascript xhr et php objet

A mon avis tu as oublié d'initialisé ton objet XHR non ? Car étant donné qu'Ajax n'est pas une technologie mais un rassemblement de plusieurs technologie web (donc une méthode de travail on va dire), ca marche forcément chez toi :)
~ iclic @ gauch,iclic, iclic @ droate, iclic, iclic
et ya pas de bôg môsieu ! ~