I purchased an affiliate program, and I needed to attach a specific field in the FORM to the transaction ID of the affiliate program. The affiliate program gives me this code to put on my thank you page which could be my Form page also.

<img src="http://pokernetonline.com/affiliate/sale.php?&amount=100.00&transaction=C" style="visibility:hidden">

Where it says transaction C, could I put a field on my FORM that the user inputs there? If so How could I do this. Thanks alot