Help making a radio button hidden for non-admins

[Greg_11]

I am trying to hide a radio button based on wether or not a user is an admin

<?php
     if (($_SESSION['admin']) == 0) ?> 
    <script>document.getElementById('adminbutton').style.display = 'none' </script>
    <?php
 if (($_SESSION['admin']) == 1) ?> 
    <script>document.getElementById('adminbutton').style.display = 'block' </script>

Obviously the above doesn't work.. Any help is, as usual, greatly appreciated.
Thanks