Customizing number of errors in validation plugin

Customizing number of errors in validation plugin

I am working on a good sized form with several fields that require validation.  I am using the wonderful Validation plugin created by Jörn.  I have most of it working correctly.  Now I need to validate a group of checkboxes, ensuring that at least one is checked.  Figured out how to do that from the fiddle here: http://jsfiddle.net/TCHYJ/
Now, my invalidHandler is not correctly reporting the number of errors.  I have 12 checkboxes of which at least one needs checking and it says "You missed 12 fields. They have been highlighted below".  Obviously this is incorrect.  How can I change this in my invalidHandler?  Here is the code for the invalidHandler:
  1. invalidHandler: function(e, validator) {
                                var errors = validator.numberOfInvalids();
                                if (errors) {
                                    var message = errors == 1
                                        ? 'You missed 1 field. It has been highlighted below'
                                        : 'You missed ' + errors + ' fields.  They have been highlighted below';
                                    $("div.errormsg span").html(message);
                                    $("div.errormsg").show();
                                    $('html, body').animate({scrollTop: $("#incidentFormDiv").offset().top}, 0);
                                } else {
                                    $("div.errormsg").hide();
                                }
                            },











Ideally, I would like to have some sort of check in there that checks if I have only missed a single block of checkboxes and change the wording accordingly.  And if there is a block of checkboxes and a single text input missing, it should say 2 errors.
Thanks!
Mike