problem with Dreamweaver template and php

[paldo]

I have create a form with sessions that works fine.
Filling in page1 brings me to page2, if I click on a button on page2 I can go back to page1 and the selected values are still there.
As soon as I attach the template the sessions do not respond, the value are not passed but set to zero. Can someone tell me why?
To see the form go here (http://www.cochard.ch/commande/commande_page1.php).

Thanks for your help