Thanks - that worked! (I considered changing the values to yes/no, but couldn't figure out how to change some javascript code that I found to show/hide various menus so I decided not to mess with it.)
I tried:
$yesno = ($_POST['yesno'] == 1 ? "yes" : "no");
and
$yesno = $_POST['yesno'];
$reply=($_POST['yesno'] == 1 ? "yes" : "no");
And they both seem to work fine - I get "yes" or "no" instead of 1 or 2.
Now I have another problem - after I retrieved the form info, I used the mail() function to send it to myself via email (which works fine) and following that had this:
echo "Your reply was: $reply.<br>";
And now that I added in the functioning code, this text no longer shows up on the php page when the form is submitted. Any help for that?