In order to allow dynamically active validation, the digits validator should access and respect it parameter. This would allow code similar to:

$(document).ready(function() {
 $("#formid").bind("validate",function(e,validator) {}).validate({
   rules: {
     fieldOne: {required : true},
     fieldTwo: {
       required: true,
       digits: function(e) { return $
(e.target).find("input[name=fieldOne]:checked").val) == 'digits'; }
     }
   }
 }
}

Thanks.

(*Chris*)