PHP: Need help with finding location of .php?pln='?'

[CircleOfLinks]

Hi,
im having a massive problem for the past few days i have been trying to change some options on my website.
The problem im haing is:

After completing one of the forms below and selecting paypal / credit card as the payment option

http://www.aussiepages.com.au/signup_standard.php (goes to ?pln=S)
http://www.aussiepages.com.au/signup_image.php (goes to ?pln=P)
http://www.aussiepages.com.au/signup_image_new.php (goes to ?pln=O)

It takes you to the following page to continue with the 'checkout' process

http://www.aussiepages.com.au/paypal.php?pln=S
http://www.aussiepages.com.au/paypal.php?pln=P
http://www.aussiepages.com.au/paypal.php?pln=O

After making payment or canceling payment it redirects you back to either:

http://www.aussiepages.com.au/confir...?refer=success
http://www.aussiepages.com.au/confir...p?refer=cancel

I need to change the payment buttons on all 3 forms becuase my affiliate company has given me a code and i need paypal to redirect users after payment to a 'thank you' page where the affiliate company can track the sales generated. The problem were having is even my new webdesinger cant seem to find where the ?pln= is leading to. I have tried contacting my old designer but he is not repling to my calls/emails.
Please if someone can help i would really appreciate it as this is extrlmy urgent.

thanks everyone for your time and help

danny

[exam]

The paypal button code would most likely be in the paypal.php file in the root directory of your site. If the site uses templates, it might be somewhere else. If you want, you could PM me the code in paypal.php and I can take a look at it. I only say use a PM because it might be best not to post it in a public forum.

[CircleOfLinks]

thanks everyone. all sorted out now.

regards
danny