Build a special chronforms-form (4) for joomla 1.7

I have 10 dropdowns with each 3 options. For every option, 'points' are given. When the form is submitted, an email has to be send depending of the sum of all points. For example: dropdown 1: option a (1 point) option b (3 points) option c (5 points) dropdown 2: option a (1 point) option b (3 points) option c (5 points) dropdown 3: option a (1 point) option b (3 points) option c (5 points) After submitting: 10-20 points; mail 1 has to be send 21-40 points; mail 2 has to be send 41-60 points; mail 3 has to be send. 61-85 points; mail 4 has to be send. 86-100 points; mail 5 has to be send. The points have to be invisible for visitors. I allready have some code to choose email depending on the points: <?php if ( $total <=21 ) { ?> // mail 1 <?php } elseif ( $total <= 41 ) { ?> // mail 2 <?php } elseif ( $total <= 61 ) { ?> // mail 3 <?php } elseif ( $total <= 86 ) { ?> // mail 4 } else { ?> // mail 5 <?php } Form has to be build with chronoforms 4