Php flash mysql xml problems

hello, I found a tutorial on how to integrate flash php mysql xml to work together
http://www.adobe.com/devnet/flash/articles/flash_xmlphp.html

I follow every steps on the tutorial but never succeed if i create another one with my own databse , flash , php files… why is it like that?? I am using flash 8 pro, the tutorial used Mx pro, is this the problem??