Required fields

Hello,
I have three fields in my product page.
One for the customer send me a photo. (upload field)
One for the customer send me a code for a photo. (text field)
An one select field for choose witch one of these two options.
The thing is that is mandatory one of the two options but not the two at the same time.
I wrote a javascript to hide the upload field and show the text field when the user select to send me the code, and vice versa.
In this javascript I also tryed to change the ‘wccpf-mandatory’ attribute of those fields when I hide or show, but seems that the plugin read the mandatory fields from other place (perhaps the admin page).
Is it possible to do what I need???
Thank you in advance.