READ jeffa's post first but:

<tr>
          <td align="right">Description of Checkbox</td>
          <td align="right"><input type="radio" name="foobar" value="0
+" checked>
</td>
          <td colspan="6"><b>No preference.</b></td>
        </tr>
[download]

And call it with:

my $foobar = param('foobar');
die "Invalid datatype for foobar" if $foobar =~ /[^0-9]/;
print "checked\n" if $foobar == 0;
[download]

"Pain is weakness leaving the body, I find myself in pain everyday" -me