Output the value of a radio button after registration

[N8]

Around line 552 on register.php - I have the following code, redirecting users to payments.php after they successfully submit their registration.

  header( 'Location: payments.php' ) ;

What I need to do is have it set up like this:



IF (radio button is selected BUYER) {
header (' buyer location ')
else
heaer ('seller location ')

		<tr><td valign="top"><label for="rb_cpf_field6_1"><input type="radio" name="userfield[field6]" value="1" id="rb_cpf_field6_1" checked="checked" />Seller: I would like to list my equipment</label></td></tr><tr><td valign="top"><label for="rb_cpf_field6_2"><input type="radio" name="userfield[field6]" value="2" id="rb_cpf_field6_2"  />Buyer: I'd like to inquire about a listing</label></td></tr><tr><td valign="top"><label for="rb_cpf_field6_3"><input type="radio" name="userfield[field6]" value="3" id="rb_cpf_field6_3"  />Both: I'm interested in buying and selling</label></td></tr><tr><td valign="top"><label for="rb_cpf_field6_4"><input type="radio" name="userfield[field6]" value="4" id="rb_cpf_field6_4"  />Other: I'm here for another purpose</label></td></tr>

How do I grab the value of the radio button in register.php?



Have tried $_POST['Account']; and $_POST['userfield[field6]']; - both dont work and I'm not sure what else to try