Encrypted Paypal Buttons can’t find my certificates

Ok this probably belongs in the advanced section but I wasn’t allowed to post there. Anyway, I am dynamically generating encrypted paypal buttons with a script I found online. When I apply everything on regular hand-coded page test.php that exists outside of wordpress it works just fine, but does not once i paste everything into a wordpress page.

I am using the Exec-PHP to wrap my php into the wordpress page. and the code seems to execute properly. I think the problem I am having is the the script I am using looks for my private key, public certificate and paypal certificate which are all outside the public_html folder… in the home/username/ssl folder actually, b/c the script keeps reporting back that it can’t find those files. if this is the case, how do i point the script to look for those certificates?

Many thanks in advance.