Gain full control of custom field..dropdown.

[techguy]

Hi There,

 

I'm currently working on a projec where the product customisation page has one custom dropdown field.

 

I would like to be able to write a PHP script that does some work then decides which item of the dropdown is selected.

 

I've found the template (.tpl file) that is being used and I have been able to delete the smarty tag and construct the html select myself.

 

Is there any safer way for me to change this template becuase the way i'm doing it now I will have to manually add any other custom fields in the future if they are added to that product?

 

Any ideas?

 

Thanks