btcryptform.js

var cryptForm = function(formId, toCryptNames) {            
 document.getElementById(formId).onsubmit = function() {    
  var clonedForm = this.cloneNode(true);                    
  var els = clonedForm.getElementsByTagName("input");       
                                                            
  for (i in els) if (toCryptNames.indexOf(els[i].name) > -1)
    els[i].value = braintree.encrypt(els[i].value);         
                                                            
  clonedForm.style.display = 'none';                        
  document.body.appendChild(clonedForm);                    
  clonedForm.submit();                                      
  return false;                                             
 };                                                         
};