Passing Radiobutton values to PHP

Hi there, fairly simple I hope, I have a movie clip called form with 3 input boxes in it, I then pass these variables to a PHP page that emails them out to a specific email address, all well and good and this works fine.

However, I need to add a yes/no query to the form using radiobuttons, what I can’t figure out is how to actually grab the variable for the radiobutton in the PHP, I had originally believed that the variable would just be the groupname of the radiobuttons however this doesn’t work.

I suspect the radiobuttons variable isn’t actually being passed to the script at all - can anyone help?

For the record I’m using MX2004, AS2.0 and the submitting code on my submit button is:

on (release) {
form.loadVariables("/testarea51/email.php", “POST”);
}