[Zope] Passing variable to a python script

[Mehmet Yousouf]

Hi,
I'm trying out python scripts and can't get the variables posted from a form 
accross.
I'm calling the script from a dtml method via <dtml-var python-script-name>  
but keep getting "unknown variable" as the error .. it's a simple script that 
adds two numbers together (x = first_number + second_number) and 
first_number, second_number are from the form. The show answer method can 
display both variables (<dtml-var first_number>)
I'm using python 2 (compiled zope from source) is this the problem? if it is, 
can I run python 2 with pyton 1.52?

Regards, Mehmet