Questionnaire (plugin)

I needed a N/A option for the questionnaire to be on the left,
and the numbering to start at 0. I hacked the code to do this. 
I indicated left n/a by putting a -1 instead of 1 in the precision control,
and zero-based numbering by the negative of the number of entries
in the 'length' control.

The only problem is the results page doesn't display the graphs properly... 

Below are the modifications I made.  Any suggestions for improvement?
phpESP/admin/include/function/survey_render.inc :
I've included the code for the ranking rendering only... I didn't have
the original questionnaire.zip, so couldn't make a diff.

                        case '8':       // ranking
?>
                                        <table border="0" cellspacing="1" cellpadding="0">
                                                <tbody>
                                                <tr>
                                                        <td></td>
<?php
                                $bg = '#eeeeee';
#  additions by JRR to allow 0-based rating and N/A on the left side
#  if size is negative, labels will be 0 through size-1.
                                $limit=abs($size);
                                if ($prec < 0) {
?>
                                                        <td width="40" align="center" bgcolor="<?php echo($bg); ?>"><?php echo(_('N/A')); ?></td>
<?php                                           $bg = '#dddddd';
                                }

                                for ($j = 0; $j < $limit; $j++) {
?>
                                                        <td width="40" align="center" bgcolor="<?php echo($bg); ?>"><?php  echo (( $size < 0 )?$j:$j+1); ?></td>
<?php
                                        if ($bg == '#eeeeee')   $bg = '#dddddd';
                                        else                    $bg = '#eeeeee';
                                }
                                if ($prec > 0) {
?>
                                                        <td width="40" align="center" bgcolor="<?php echo($bg); ?>"><?php echo(_('N/A')); ?></td>
<?php
                                }
?>
                                                </tr>
<?php
                                foreach ($choices_result as $choice) {
                    $choice = (array)$choice;
                                        $cid = $choice['id'];
                                        $str = "${qid}_$cid";
?>
                                                <tr>
                                                        <td align="right"><?php echo($choice['content']); ?></td>
<?php
                                        $bg = '#eeeeee';
                                        if ($prec < 0) {
?>
                                                        <td width="40" align="center" bgcolor="<?php echo($bg); ?>"><?php echo(mkradio($str,'N/A')); ?></td>
<?php                                           $bg = '#dddddd';
                                        }

                                        for ($j = 0; $j < $limit; $j++) {
?>
                                                        <td width="40" align="center" bgcolor="<?php echo($bg); ?>"><?php echo(mkradio($str,$j)); ?></td>
<?php
                                                if ($bg == '#eeeeee')   $bg = '#dddddd';
                                                else                    $bg = '#eeeeee';
                                        }
                                        if ($prec > 0) {
?>
                                                        <td width="40" align="center" bgcolor="<?php echo($bg); ?>"><?php echo(mkradio($str,'N/A')); ?></td>
<?php
                                        }
?>
                                                </tr>
<?php                   } ?>
                                        </tbody>
                                        </table>
<?php
                                break;