Field Validation Success Function

Field Validation Success Function

I need to invoke a method when a field validation is either successful or unsuccessful.  I have managed to get the function to run if the field validation fails by using the following:
  1. $('#myform').validate({
  2.       rules: {
  3.             client_name: {
  4.                   required: true
  5.             }, client_email: {
  6.                   required: true
  7.             }
  8.       }, messages {
  9.             client_name: {
  10.                   required: function() {
  11.                         showBigRedCross('client_name');
  12.                   }
  13.             },
  14.             client_email: {
  15.                   required: function() {
  16.                         showBigRedCross('client_email');
  17.                   }
  18.             }
  19.       }
  20. });
But how do I invoke a method specific to a field that triggers when the field validates successfully?  I need to invoke showBigGreenTick(fieldname) for the fields that are valid.

Please help.

On another note, I find it very strange the the documentation is so poor regarding this validation.  To even find out that there was a "messages" option for validate was found on another website.  There is no mention of it in the docs.