Counter Using FLASH PHP XML please help!

Hi to all.

I have found from kirupa site an interesting tutorial about using flash & php to change values in an XML file.
So i tried to make something like a counter for a site using PHP XML and flash

How it works.

The XML holds the number of visits
The swf every time a user pushes the button takes from the XML the number and adds one (last visit the one who pushes the button) and i want also this new number to send it back to the XML and save it somehow using the PHP file.
The problem is that i cant`t make it work

I tried a lot but none came to action
I attach the fla,swf,php and XML file if anyone can give a hand because i am new in PHP and XML

any advise would be appreciate it