popen with linux: permission denied

[Daniel Neugebauer]

Hi!

I don't actually know if this is the right group to ask in but I was 
writing on a brief python script when the following error occured:

I execute my script using Apache, so it can give me a HTML site in a 
browser. This worked just fine until I tried to popen another Python 
script. No matter which user owns that file or has privileges to 
access/execute it on the shell, I am unable to launch it from my script. If 
I enter another command it works fine - it just seems to dislike my script.

As I'm a newbie to Python it would be great if someone were able to give 
some advice.

Thanks,
Daniel